Three key points:
1) Over four months, tests were conducted to test the EM Drive propulsion concept using a partially loaded resonant cavity. A thrust measurement apparatus was built with 0.5 mN accuracy.
2) Finite element simulations informed the design of a cylindrical cavity partially loaded with dielectrics. Resonances were found using a Vector Network Analyzer. Displacements observed corresponded to 2.4 mN of thrust but perpendicular displacements of unknown cause were also observed.
3) Further funding is needed to refine the experimental apparatus and reduce uncertainties in order to fully validate or refute the EM Drive concept.
Investigation of Anomalous Thrust and Proposal for Future ExperimentationBrian Kraft
The document summarizes an experiment investigating anomalous thrust from an asymmetric resonant cavity. A second phase is proposed using a copper frustum cavity excited in the TE011 mode by a 200W solid state amplifier at 1.8-2.4GHz. Computer simulations will ensure resonance. The apparatus will use a pendulum to measure thrust to a resolution of 0.5mN. Previous experiments observed anomalous thrust but results varied due to inconsistent procedures. The second phase aims to replicate previous experiments more rigorously.
A. Investigation and Analysis of Anomalous Thrust ExperimentsKurt Zeller
NASA and several independent researchers have conducted experiments testing a novel propulsion technology called the EM Drive, which produces thrust without ejecting propellant by utilizing a resonant microwave cavity. Key findings include:
1) Experiments by NASA, NWPU in China, SPR Ltd., and Guido Fetta observed thrust-to-power ratios ranging from 0.021 N/kW to 1.03 N/kW, exceeding ion thrusters.
2) NASA's tests in a hard vacuum matched results from initial atmospheric tests, finding thrust from both an EM Drive and Cannae Drive configuration.
3) Device designs and test parameters like power level, frequency, cavity material, and inclusion of a dielectric varied between experiments
Investigation of a Partially Loaded Resonant Cavity_Zeller_KraftKurt Zeller
This experiment aimed to demonstrate the "EM Drive" effect using a tunable, partially loaded cylindrical cavity powered by a microwave oven magnetron. Testing revealed pendulum deflections caused by thermal effects from the magnetron leads, not anomalous thrust. Key factors like cavity quality factor and magnetron bandwidth must be considered to successfully analyze this anomaly. Although inconclusive, this highlighted design challenges that could help future experiments demonstrate the EM Drive effect if addressed.
The document discusses the design of resonant cavities for testing the EM Drive phenomenon. Early designs using thin copper sheet metal were found to thermally warp over time, degrading resonance. A new design was proposed using a solid aluminum slug turned on a lathe, allowing for greater thickness, precision and resistance to warping. Simulations were performed to refine the dimensions and spherical end caps were proposed to improve resonance quality. The final planned design was to recreate the dimensions used successfully by Iulian Berca using the copper plate, in order to validate his claimed results.
This document summarizes an experiment on wireless energy transfer using inductive resonant coupling between coils. The experiment measured the efficiency of power transfer and the angle between transmitter and receiver coils. Key results showed that efficiency decreases as coil separation increases, reaching -30dB beyond 8cm. Maximum efficiency occurred when coils were directly facing each other with parallel planes at 0cm separation. Further work will explore using reflecting surfaces and comparing inductive coupling to "strong" resonant coupling.
This document summarizes research on using electric fields to control the magnetic states of FeGa nanomagnets. Key findings include:
1) An electric field was used to rotate the magnetization of some isolated FeGa nanomagnets by up to 400 degrees. The new magnetization state persisted after removing the electric field, demonstrating a non-volatile effect.
2) In dipole-coupled nanomagnet pairs with one "hard" and one "soft" nanomagnet, an electric field rotated the soft nanomagnet's magnetization by over 900 degrees due to influence from the hard nanomagnet.
3) Being able to control nanomagnet states with
A study of transient characteristics of an actual wind turbine grounding syst...duncans50
This study analyzed the transient grounding characteristics of an actual wind turbine generator system using experimental methods. Impulse tests were conducted where fast front current was injected into the system's foundation. Potential rise was measured at the foundation and around it out to 18 meters. Results showed the grounding system exhibited strong inductiveness at current wave fronts. Frequency analysis also provided voltage responses to various lightning waveforms. Data on the low resistivity site can inform lightning protection for offshore wind turbines.
Analysis of Anomalous Thrust Experiments from an Asymmetric CavityBrian Kraft
1) Several institutions have tested novel propulsion devices called EM Drives and Cannae Drives that produce thrust without propellant by using resonant microwave cavities. Results have ranged from 0.02 N/kW to 1.03 N/kW of thrust.
2) The document analyzes differences between experiments such as cavity design, materials, power levels, measurement techniques, and number of test runs. It finds variations in these factors likely contributed to differing results.
3) Specifically, NASA JSC Eagleworks obtained the lowest thrust of 0.0021 N/kW using a tapered cylindrical cavity with a dielectric insert, while other experiments excluding Tajmar obtained over 0.1 N/kW
Investigation of Anomalous Thrust and Proposal for Future ExperimentationBrian Kraft
The document summarizes an experiment investigating anomalous thrust from an asymmetric resonant cavity. A second phase is proposed using a copper frustum cavity excited in the TE011 mode by a 200W solid state amplifier at 1.8-2.4GHz. Computer simulations will ensure resonance. The apparatus will use a pendulum to measure thrust to a resolution of 0.5mN. Previous experiments observed anomalous thrust but results varied due to inconsistent procedures. The second phase aims to replicate previous experiments more rigorously.
A. Investigation and Analysis of Anomalous Thrust ExperimentsKurt Zeller
NASA and several independent researchers have conducted experiments testing a novel propulsion technology called the EM Drive, which produces thrust without ejecting propellant by utilizing a resonant microwave cavity. Key findings include:
1) Experiments by NASA, NWPU in China, SPR Ltd., and Guido Fetta observed thrust-to-power ratios ranging from 0.021 N/kW to 1.03 N/kW, exceeding ion thrusters.
2) NASA's tests in a hard vacuum matched results from initial atmospheric tests, finding thrust from both an EM Drive and Cannae Drive configuration.
3) Device designs and test parameters like power level, frequency, cavity material, and inclusion of a dielectric varied between experiments
Investigation of a Partially Loaded Resonant Cavity_Zeller_KraftKurt Zeller
This experiment aimed to demonstrate the "EM Drive" effect using a tunable, partially loaded cylindrical cavity powered by a microwave oven magnetron. Testing revealed pendulum deflections caused by thermal effects from the magnetron leads, not anomalous thrust. Key factors like cavity quality factor and magnetron bandwidth must be considered to successfully analyze this anomaly. Although inconclusive, this highlighted design challenges that could help future experiments demonstrate the EM Drive effect if addressed.
The document discusses the design of resonant cavities for testing the EM Drive phenomenon. Early designs using thin copper sheet metal were found to thermally warp over time, degrading resonance. A new design was proposed using a solid aluminum slug turned on a lathe, allowing for greater thickness, precision and resistance to warping. Simulations were performed to refine the dimensions and spherical end caps were proposed to improve resonance quality. The final planned design was to recreate the dimensions used successfully by Iulian Berca using the copper plate, in order to validate his claimed results.
This document summarizes an experiment on wireless energy transfer using inductive resonant coupling between coils. The experiment measured the efficiency of power transfer and the angle between transmitter and receiver coils. Key results showed that efficiency decreases as coil separation increases, reaching -30dB beyond 8cm. Maximum efficiency occurred when coils were directly facing each other with parallel planes at 0cm separation. Further work will explore using reflecting surfaces and comparing inductive coupling to "strong" resonant coupling.
This document summarizes research on using electric fields to control the magnetic states of FeGa nanomagnets. Key findings include:
1) An electric field was used to rotate the magnetization of some isolated FeGa nanomagnets by up to 400 degrees. The new magnetization state persisted after removing the electric field, demonstrating a non-volatile effect.
2) In dipole-coupled nanomagnet pairs with one "hard" and one "soft" nanomagnet, an electric field rotated the soft nanomagnet's magnetization by over 900 degrees due to influence from the hard nanomagnet.
3) Being able to control nanomagnet states with
A study of transient characteristics of an actual wind turbine grounding syst...duncans50
This study analyzed the transient grounding characteristics of an actual wind turbine generator system using experimental methods. Impulse tests were conducted where fast front current was injected into the system's foundation. Potential rise was measured at the foundation and around it out to 18 meters. Results showed the grounding system exhibited strong inductiveness at current wave fronts. Frequency analysis also provided voltage responses to various lightning waveforms. Data on the low resistivity site can inform lightning protection for offshore wind turbines.
Analysis of Anomalous Thrust Experiments from an Asymmetric CavityBrian Kraft
1) Several institutions have tested novel propulsion devices called EM Drives and Cannae Drives that produce thrust without propellant by using resonant microwave cavities. Results have ranged from 0.02 N/kW to 1.03 N/kW of thrust.
2) The document analyzes differences between experiments such as cavity design, materials, power levels, measurement techniques, and number of test runs. It finds variations in these factors likely contributed to differing results.
3) Specifically, NASA JSC Eagleworks obtained the lowest thrust of 0.0021 N/kW using a tapered cylindrical cavity with a dielectric insert, while other experiments excluding Tajmar obtained over 0.1 N/kW
The researchers built a low rotation sensing interferometric fiber optic gyroscope (I-FOG) using an amplified open loop Sagnac interferometer. The device was able to detect rotations as low as 1 degree per minute. Sensitivity was achieved using a piezoelectric modulator paired with a lock-in amplifier to reduce noise and amplify the signal. While the device could detect rotations of 1 degree per minute, reliable measurements of the Earth's rotation of 0.25 degrees per minute were not possible due to limitations of the calibration equipment. Future work to improve sensitivity includes reducing noise and using more reliable components.
This document provides an overview of different types of velocity-modulated tubes used in radar technology. It describes the basic construction and operating principles of klystron amplifiers, traveling wave tubes, magnetrons, and other microwave tubes. The key types covered are klystrons, traveling wave tubes, magnetrons, and carcinotrons. It provides details on how each type works, including illustrations of their internal components and electron beam interactions.
The document summarizes research into using superconducting magnets for radiation protection in space. Simulation results found magnetic fields of 9 Tesla could reduce radiation flux inside a habitat by a factor of 3 to 10. A conceptual design for a magnetic shield would have a mass of 400-1600 metric tons, require 52-75 tons of liquid helium, and 117-169 kW of power to operate cryocoolers. Optimization could reduce mass by reducing magnetic field strength and increasing thickness to maintain bending power. The design requires further engineering analysis to develop a practical implementation.
This document summarizes a study that tested a new method of generating ELF/VLF radio waves called "geometric modulation" using the HAARP ionospheric heating facility. Geometric modulation involves scanning the HF heating beam in a pattern, rather than modulating its power, to generate ELF/VLF signals. The study found geometric modulation can enhance ELF/VLF wave amplitudes by up to 11 dB compared to conventional amplitude modulation, especially at frequencies above 3 kHz and distances over hundreds of kilometers. Geometric modulation also allows directing the signal into the Earth-ionosphere waveguide, forming a steerable large-element ELF/VLF array.
03 motl lukic_yakovlevelsherbenietal_printedantennadesignspatialpowercombinerCarlos Andres
The document discusses printed antenna designs for broadband waveguide-based spatial power combiners. It investigates the effect of antenna design parameters on bandwidth performance. Meander-slot antennas and their variations are proposed to increase bandwidth and efficiency compared to traditional rectangular patch and slot antennas. Numerical results show interacting single patch and meander slot antennas, as well as arrays of interacting U-strip, U-slot, and meander slot antennas, have advantages in scattering characteristics for spatial power combining applications.
This document describes the design, simulation, fabrication, and testing of a broadband discone antenna with an operating frequency range of 500 MHz to 1 GHz. The author theoretically designed the discone antenna by selecting design parameters like a 66 degree flare angle and 750 MHz operating frequency. Simulation in HFSS optimized the parameters, resulting in a 1 mm cone-disc gap and 76.25 mm disc diameter. A physical model was constructed and tested, with measured return loss crossing -10 dB around 890 MHz. While the simulated and measured operating frequencies were higher than the intended 750 MHz, the discone antenna design achieved the goal of operating over 500 MHz to 1 GHz.
Microwave transmission lines include coaxial cables, waveguides, and strip lines. Strip lines have configurations like microstrip lines, parallel strip lines, coplanar strip lines, and shielded strip lines. Microstrip lines use a conducting strip separated from a ground plane by a dielectric substrate. They have quasi-TEM mode transmission and characteristic impedances typically between 50-150 ohms. Power losses in microstrip lines include ohmic, dielectric, and radiation losses. The document derives equations for microstrip line characteristic impedance and propagation properties, and discusses sources of loss and quality factors.
This document proposes a system for wireless power transfer to electric vehicles using magnetic resonant couplings. It presents experimental results on helical antennas that could be installed on electric vehicles. The experiments show that:
1) Resonant frequencies of the transmitting and receiving antennas change depending on the air gap between them, but maximum efficiency remains high even for large air gaps.
2) Efficiency remains around 95-97% for air gaps up to 200mm and remains high even when coupling coefficients are weak at large air gaps.
3) Efficiency remains constant, around 95-96%, for varying power levels from -15dBm to 100W, showing that efficiency does not depend on power as predicted by equivalent circuit models.
An electron gun generates an electron beam that is interacting with a slow-wave structure.
It sustains the oscillations by propagating a traveling wave backwards against the beam
. The generated electromagnetic wave power has its group velocity directed oppositely to the direction of motion of the electrons.
The output power is coupled out near the electron gun.
Particle physics is now at the threshold of great discoveries. The experiments with particle accelerators and observations of the cosmos have focused attention on phenomena that can not be explained by the standard theory. The technology based on superconducting niobium accelerating cavities can reach a high expenditure of energy by many orders of magnitude lower than that of normal-conducting copper cavities. Even taking into account the power spent to maintain the temperature of liquid helium, the net gain in economic terms is still unassailable.
The sputtering technology was chosen first in the pure diode configuration and subsequently in the magnetron configuration. High Power Impulse Magnetron Sputtering (HIPIMS) is an evolution of the magnetron technique which relies on 100μs high voltage pulses of the order of 1 kV compared to the 300 V of the standard DC magnetron process. During the pulse a huge power density is deposited onto the target, of the order of a few kW/cm2 compared to a few W/cm2 of the standard DC process, producing a highly dense plasma in which also the Nb atoms are partially ionized. These can in turn be attracted to the substrate with a suitable bias. A further advantage of the technique lies in the fact that no hardware changes are required compared to a standard DC biased magnetron system, except for the obvious replacement of the power supply.
In this work, an R&D effort has been undertaken to study the HIPIMS, to improve it and understand the correlation between the parameters applied and the film morphology, the superconducting properties and the RF film quality.
The experiment system is based on the NEW HIGH-RATE SYSTEM for the deposition cavity 1.5 GHz. The experimental details and the measurements of the characteristics of the deposited films are described. Even though the work is still in progress, all of the partial results from now on have been analyzed and commented, in order to extrapolate all the information. The final results are a global overview of the HIPIMS techniques for Nb on 1.5Hz superconducting cavity. Suggestions for future efforts have been included as part of the conclusions.
The document outlines the design of a helical resonator for use in a penning ion trap. It discusses different types of resonators and why a helical design is best. The document provides details on the design parameters and theoretical calculations for a 190 MHz helical resonator. Simulations of the resonator were performed using HFSS software, finding good agreement with theoretical resonant frequency and Q-factor values. The effect of different capacitive loads on resonant frequency was also studied through simulations. In conclusion, the helical resonator design is suitable for detection of charged particles in the penning ion trap application.
The document summarizes research on a proposed plasma magnet propulsion concept. Key points:
1) Experiments at the University of Washington generated and sustained up to 10kA of plasma current using a rotating magnetic field, enough to inflate a plasma bubble similar to a mini-magnetosphere.
2) Measurements found electron temperatures of 18eV and densities sufficient to sustain particle confinement for over a year within an inflated 100km plasma bubble.
3) Numerical simulations modeled self-consistent electron motion within experimental rotating dipole fields and plasma inflation dynamics, supporting the feasibility of the plasma magnet concept for deep space exploration propulsion.
NS2 installation guideline for the student to install the software . It use for student to install and download the software. The software is about the experimental of communication technology.
Magnetic Femtotesla Inductor Coil Sensor for ELF Noise Signals-( 0.1Hz to3.0 Hz)IOSR Journals
This document describes the design of a magnetic field sensor to detect extremely low frequency (ELF) noise signals between 0.1 Hz to 3 Hz. It discusses the design of the loop antenna, transformer, and amplifier components. The antenna design aims to achieve optimal sensitivity while balancing factors like size, weight and resistance. A transformer is used to electrically isolate the antenna and match its impedance to the amplifier. Design considerations are provided to achieve a flat frequency response between the transformer's lower and upper cutoff frequencies. The overall system sensitivity depends on the transformer turn ratio and balancing the amplifier's voltage and current noise sources.
This document discusses the design and applications of multicavity klystron amplifiers. It begins by explaining how multicavity klystrons are able to make use of transit time instead of fighting it. It then provides details on the design of multicavity klystrons, including how they contain multiple cavities to improve bunching and efficiency. Finally, it discusses several applications of multicavity klystron amplifiers, including use in UHF-TV transmitters, satellite communication ground stations, radar transmission, and as power oscillators.
1. The document discusses various topics related to antenna parameters and radiation patterns. It describes the radiation mechanism of single wire, two wire, and dipole antennas.
2. Current distribution on thin wire antennas is explained. Parameters like radiation patterns, patterns in principal planes, main lobe and side lobes, beam widths, and polarization are discussed.
3. Key points about radiation patterns, coordinate systems, principal plane patterns, and definitions of main lobe, side lobes, half power beamwidth and first null beamwidth are provided.
RF MEMS switches were first invented and reduced to practice in 1993 as a means of achieving the low RF loss afforded by MEMS and micromachining technology. The use of a capacitive coupling mechanism entirely eliminates issues associated with dry contact, metal-metal ohmic switching. Over the years, investments by government and corporate IR&D have evolved these switches considerably. Presently, capacitive MEMS switches, and MEMS switches in general, provide the lowest loss means for switching and routing RF, microwave, and millimeter-wave signals. Over the past decade processing improvements, material refinements, and RF and mechanical design changes have allowed MEMS capacitive switches to demonstrate ultra-low loss (<0.1>+66 dBm
The document discusses various types of antennas used in wireless communication systems including Wi-Fi dipole antennas, FM dipole antennas, parabolic dish antennas, whip antennas, sectored antennas, and microwave antennas. It provides details on the operating principles, applications, and simulations of these antennas. Key points covered include that Wi-Fi dipoles operate at 2.4 GHz, FM dipoles are used for VHF reception between 87.5-108 MHz, parabolic dishes concentrate signals at their focal point, and sectored and microwave antennas are used in cellular base stations for directional transmission.
This document provides an overview of microwave tubes, including their components and operating principles. It discusses cavity resonators, rectangular cavity resonators, limitations of conventional vacuum tubes at high frequencies, and types of microwave tubes like klystrons, traveling wave tubes (TWTs), and magnetrons. Magnetrons are used in microwave ovens and produce hundreds of watts of microwave power by directing an electron beam in a circular pattern using a strong magnetic field. TWTs amplify signals in the microwave frequency range from 500 MHz to 300 GHz using an electron beam interacting with a slow-wave structure.
Los documentos electrónicos se utilizan para ahorrar tiempo y espacio de almacenamiento, permitiendo que las decisiones se implementen de manera más eficiente y los documentos importantes se guarden de forma segura. También se usan para compras y ventas en internet de una manera más sencilla, así como para descargar música, películas y videojuegos. Los documentos electrónicos facilitan además realizar tareas, videoconferencias educativas, presentaciones digitales y buscar información en la web.
This document provides a summary of an experienced accountant seeking a position as an accounts manager. It outlines their 7 years of experience in accounting and finance in the Gulf region. Their qualifications include a Bachelor's degree in Commerce with Accounting and they have attended training courses in real estate and finance. Their most recent role was as Accounts Manager for a trading company in the UAE, where they oversaw accounting functions and prepared financial reports. They have a proven track record of managing accounts payable and receivable, financial reporting, and ensuring compliance.
The researchers built a low rotation sensing interferometric fiber optic gyroscope (I-FOG) using an amplified open loop Sagnac interferometer. The device was able to detect rotations as low as 1 degree per minute. Sensitivity was achieved using a piezoelectric modulator paired with a lock-in amplifier to reduce noise and amplify the signal. While the device could detect rotations of 1 degree per minute, reliable measurements of the Earth's rotation of 0.25 degrees per minute were not possible due to limitations of the calibration equipment. Future work to improve sensitivity includes reducing noise and using more reliable components.
This document provides an overview of different types of velocity-modulated tubes used in radar technology. It describes the basic construction and operating principles of klystron amplifiers, traveling wave tubes, magnetrons, and other microwave tubes. The key types covered are klystrons, traveling wave tubes, magnetrons, and carcinotrons. It provides details on how each type works, including illustrations of their internal components and electron beam interactions.
The document summarizes research into using superconducting magnets for radiation protection in space. Simulation results found magnetic fields of 9 Tesla could reduce radiation flux inside a habitat by a factor of 3 to 10. A conceptual design for a magnetic shield would have a mass of 400-1600 metric tons, require 52-75 tons of liquid helium, and 117-169 kW of power to operate cryocoolers. Optimization could reduce mass by reducing magnetic field strength and increasing thickness to maintain bending power. The design requires further engineering analysis to develop a practical implementation.
This document summarizes a study that tested a new method of generating ELF/VLF radio waves called "geometric modulation" using the HAARP ionospheric heating facility. Geometric modulation involves scanning the HF heating beam in a pattern, rather than modulating its power, to generate ELF/VLF signals. The study found geometric modulation can enhance ELF/VLF wave amplitudes by up to 11 dB compared to conventional amplitude modulation, especially at frequencies above 3 kHz and distances over hundreds of kilometers. Geometric modulation also allows directing the signal into the Earth-ionosphere waveguide, forming a steerable large-element ELF/VLF array.
03 motl lukic_yakovlevelsherbenietal_printedantennadesignspatialpowercombinerCarlos Andres
The document discusses printed antenna designs for broadband waveguide-based spatial power combiners. It investigates the effect of antenna design parameters on bandwidth performance. Meander-slot antennas and their variations are proposed to increase bandwidth and efficiency compared to traditional rectangular patch and slot antennas. Numerical results show interacting single patch and meander slot antennas, as well as arrays of interacting U-strip, U-slot, and meander slot antennas, have advantages in scattering characteristics for spatial power combining applications.
This document describes the design, simulation, fabrication, and testing of a broadband discone antenna with an operating frequency range of 500 MHz to 1 GHz. The author theoretically designed the discone antenna by selecting design parameters like a 66 degree flare angle and 750 MHz operating frequency. Simulation in HFSS optimized the parameters, resulting in a 1 mm cone-disc gap and 76.25 mm disc diameter. A physical model was constructed and tested, with measured return loss crossing -10 dB around 890 MHz. While the simulated and measured operating frequencies were higher than the intended 750 MHz, the discone antenna design achieved the goal of operating over 500 MHz to 1 GHz.
Microwave transmission lines include coaxial cables, waveguides, and strip lines. Strip lines have configurations like microstrip lines, parallel strip lines, coplanar strip lines, and shielded strip lines. Microstrip lines use a conducting strip separated from a ground plane by a dielectric substrate. They have quasi-TEM mode transmission and characteristic impedances typically between 50-150 ohms. Power losses in microstrip lines include ohmic, dielectric, and radiation losses. The document derives equations for microstrip line characteristic impedance and propagation properties, and discusses sources of loss and quality factors.
This document proposes a system for wireless power transfer to electric vehicles using magnetic resonant couplings. It presents experimental results on helical antennas that could be installed on electric vehicles. The experiments show that:
1) Resonant frequencies of the transmitting and receiving antennas change depending on the air gap between them, but maximum efficiency remains high even for large air gaps.
2) Efficiency remains around 95-97% for air gaps up to 200mm and remains high even when coupling coefficients are weak at large air gaps.
3) Efficiency remains constant, around 95-96%, for varying power levels from -15dBm to 100W, showing that efficiency does not depend on power as predicted by equivalent circuit models.
An electron gun generates an electron beam that is interacting with a slow-wave structure.
It sustains the oscillations by propagating a traveling wave backwards against the beam
. The generated electromagnetic wave power has its group velocity directed oppositely to the direction of motion of the electrons.
The output power is coupled out near the electron gun.
Particle physics is now at the threshold of great discoveries. The experiments with particle accelerators and observations of the cosmos have focused attention on phenomena that can not be explained by the standard theory. The technology based on superconducting niobium accelerating cavities can reach a high expenditure of energy by many orders of magnitude lower than that of normal-conducting copper cavities. Even taking into account the power spent to maintain the temperature of liquid helium, the net gain in economic terms is still unassailable.
The sputtering technology was chosen first in the pure diode configuration and subsequently in the magnetron configuration. High Power Impulse Magnetron Sputtering (HIPIMS) is an evolution of the magnetron technique which relies on 100μs high voltage pulses of the order of 1 kV compared to the 300 V of the standard DC magnetron process. During the pulse a huge power density is deposited onto the target, of the order of a few kW/cm2 compared to a few W/cm2 of the standard DC process, producing a highly dense plasma in which also the Nb atoms are partially ionized. These can in turn be attracted to the substrate with a suitable bias. A further advantage of the technique lies in the fact that no hardware changes are required compared to a standard DC biased magnetron system, except for the obvious replacement of the power supply.
In this work, an R&D effort has been undertaken to study the HIPIMS, to improve it and understand the correlation between the parameters applied and the film morphology, the superconducting properties and the RF film quality.
The experiment system is based on the NEW HIGH-RATE SYSTEM for the deposition cavity 1.5 GHz. The experimental details and the measurements of the characteristics of the deposited films are described. Even though the work is still in progress, all of the partial results from now on have been analyzed and commented, in order to extrapolate all the information. The final results are a global overview of the HIPIMS techniques for Nb on 1.5Hz superconducting cavity. Suggestions for future efforts have been included as part of the conclusions.
The document outlines the design of a helical resonator for use in a penning ion trap. It discusses different types of resonators and why a helical design is best. The document provides details on the design parameters and theoretical calculations for a 190 MHz helical resonator. Simulations of the resonator were performed using HFSS software, finding good agreement with theoretical resonant frequency and Q-factor values. The effect of different capacitive loads on resonant frequency was also studied through simulations. In conclusion, the helical resonator design is suitable for detection of charged particles in the penning ion trap application.
The document summarizes research on a proposed plasma magnet propulsion concept. Key points:
1) Experiments at the University of Washington generated and sustained up to 10kA of plasma current using a rotating magnetic field, enough to inflate a plasma bubble similar to a mini-magnetosphere.
2) Measurements found electron temperatures of 18eV and densities sufficient to sustain particle confinement for over a year within an inflated 100km plasma bubble.
3) Numerical simulations modeled self-consistent electron motion within experimental rotating dipole fields and plasma inflation dynamics, supporting the feasibility of the plasma magnet concept for deep space exploration propulsion.
NS2 installation guideline for the student to install the software . It use for student to install and download the software. The software is about the experimental of communication technology.
Magnetic Femtotesla Inductor Coil Sensor for ELF Noise Signals-( 0.1Hz to3.0 Hz)IOSR Journals
This document describes the design of a magnetic field sensor to detect extremely low frequency (ELF) noise signals between 0.1 Hz to 3 Hz. It discusses the design of the loop antenna, transformer, and amplifier components. The antenna design aims to achieve optimal sensitivity while balancing factors like size, weight and resistance. A transformer is used to electrically isolate the antenna and match its impedance to the amplifier. Design considerations are provided to achieve a flat frequency response between the transformer's lower and upper cutoff frequencies. The overall system sensitivity depends on the transformer turn ratio and balancing the amplifier's voltage and current noise sources.
This document discusses the design and applications of multicavity klystron amplifiers. It begins by explaining how multicavity klystrons are able to make use of transit time instead of fighting it. It then provides details on the design of multicavity klystrons, including how they contain multiple cavities to improve bunching and efficiency. Finally, it discusses several applications of multicavity klystron amplifiers, including use in UHF-TV transmitters, satellite communication ground stations, radar transmission, and as power oscillators.
1. The document discusses various topics related to antenna parameters and radiation patterns. It describes the radiation mechanism of single wire, two wire, and dipole antennas.
2. Current distribution on thin wire antennas is explained. Parameters like radiation patterns, patterns in principal planes, main lobe and side lobes, beam widths, and polarization are discussed.
3. Key points about radiation patterns, coordinate systems, principal plane patterns, and definitions of main lobe, side lobes, half power beamwidth and first null beamwidth are provided.
RF MEMS switches were first invented and reduced to practice in 1993 as a means of achieving the low RF loss afforded by MEMS and micromachining technology. The use of a capacitive coupling mechanism entirely eliminates issues associated with dry contact, metal-metal ohmic switching. Over the years, investments by government and corporate IR&D have evolved these switches considerably. Presently, capacitive MEMS switches, and MEMS switches in general, provide the lowest loss means for switching and routing RF, microwave, and millimeter-wave signals. Over the past decade processing improvements, material refinements, and RF and mechanical design changes have allowed MEMS capacitive switches to demonstrate ultra-low loss (<0.1>+66 dBm
The document discusses various types of antennas used in wireless communication systems including Wi-Fi dipole antennas, FM dipole antennas, parabolic dish antennas, whip antennas, sectored antennas, and microwave antennas. It provides details on the operating principles, applications, and simulations of these antennas. Key points covered include that Wi-Fi dipoles operate at 2.4 GHz, FM dipoles are used for VHF reception between 87.5-108 MHz, parabolic dishes concentrate signals at their focal point, and sectored and microwave antennas are used in cellular base stations for directional transmission.
This document provides an overview of microwave tubes, including their components and operating principles. It discusses cavity resonators, rectangular cavity resonators, limitations of conventional vacuum tubes at high frequencies, and types of microwave tubes like klystrons, traveling wave tubes (TWTs), and magnetrons. Magnetrons are used in microwave ovens and produce hundreds of watts of microwave power by directing an electron beam in a circular pattern using a strong magnetic field. TWTs amplify signals in the microwave frequency range from 500 MHz to 300 GHz using an electron beam interacting with a slow-wave structure.
Los documentos electrónicos se utilizan para ahorrar tiempo y espacio de almacenamiento, permitiendo que las decisiones se implementen de manera más eficiente y los documentos importantes se guarden de forma segura. También se usan para compras y ventas en internet de una manera más sencilla, así como para descargar música, películas y videojuegos. Los documentos electrónicos facilitan además realizar tareas, videoconferencias educativas, presentaciones digitales y buscar información en la web.
This document provides a summary of an experienced accountant seeking a position as an accounts manager. It outlines their 7 years of experience in accounting and finance in the Gulf region. Their qualifications include a Bachelor's degree in Commerce with Accounting and they have attended training courses in real estate and finance. Their most recent role was as Accounts Manager for a trading company in the UAE, where they oversaw accounting functions and prepared financial reports. They have a proven track record of managing accounts payable and receivable, financial reporting, and ensuring compliance.
This document summarizes how the Corcoran Unified School District tracks student truancy using various digital programs and identifies at-risk students. It discusses (1) using the student information system Aeries to record student interventions and absences, create reports and identify at-risk students; (2) other Aeries components like the parent portal to involve parents; (3) Excel to analyze multi-year attendance data; (4) the Attention 2 Attendance software to manage SARB processes and letters; (5) the Blackboard phone system to contact parents; and (6) collaborating with other agencies through the SARB committee to provide a network of support.
This community planning project in West Carleton aimed to develop supports for healthy aging in place and enhance rural vitality. Key outcomes included:
- Increased ability for seniors to age in place through new transportation supports, social groups, communication networks, and knowledge of existing services.
- Increased volunteering, community leadership, and partnerships through engagement activities.
- Creation of an action plan and ongoing task group to continue working on priorities like affordable transportation, caregiving supports, respite programs, and home care.
Critical success factors included building on existing social networks and groups, the community developer's established relationships and trust, co-creating appropriate solutions, and focusing on an issue of broad importance like aging. The initiative
This document defines a computer and its key components. It states that a computer is an electronic machine that can help with daily tasks like writing, calculations, and accessing information quickly. The document then lists some advantages of computers like speed, accuracy, and large storage capacity. It explains that hardware refers to the physical parts of a computer like the keyboard for input, monitor for output, system unit containing the CPU, mouse for pointing, printer for output, and more.
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Similar to Investigation of Anomalous Thrust from a Partially Loaded Resonant Cavity (20)
Investigation of Anomalous Thrust from a Partially Loaded Resonant Cavity
1. Investigation of Anomalous Thrust from a Partially Loaded
Resonant Cavity
By Kurt Zeller and Brian Kraft
California Polytechnic State University, San Luis Obispo, CA
Over a span of four months a number of tests were conducted in an attempt to prove the validity of the EM
Drive as a form of spacecraft propulsion. This experiment focused on the hypothesis that an asymmetric
resonance is required to produce thrust from an EM Drive. Utilizing a portion of the $4200 secured through
proposals to the Cal Poly Connect and Aerospace Student Fees Committees, a thrust measurement apparatus
was constructed with an accuracy of approximately ± 0.5 mN. Three dimensional finite element simulations
were performed to aid in the design of a partially loaded, cylindrical cavity. These designs were then verified
empirically using a Vector Network Analyzer and a mock magnetron antenna. Displacements were observed
corresponding to a calculated axial force of 2.4 mN. However, unexpected perpendicular displacements were
simultaneously observed which may be the result of spurious effects. Further funding is required to refine
and improve upon the experimental apparatus outlined in this document.
Nomenclature
HDPE = High Density Polyethylene
NSF = National Aeronautics and Space Administration Space Flight Forums
PSD = Position Sensing Device
Q = Quality Factor
VNA = Vector Network Analyzer
VSWR = Voltage Standing Wave Ratio
I. Introduction
A novel propulsion technology has been investigated at several institutions which utilizes an electromagnetic
resonant cavity to produce thrust without ejecting propellant. Several highly regarded institutions as well as a
variety of independent experimenters have observed thrust to varying degrees of success. The anomalous thrust has
not been fully explained within the current understanding of physical laws and should be further investigated.1-6
An experiment was developed to investigate the results observed using a symmetric cylindrical cavity partially
loaded with several different dielectrics. A microwave oven magnetron was used to provide the cavity with
approximately 950 W of RF power. A low thrust measurement apparatus was developed using a pendulum, laser,
and position sensing detector. This apparatus achieved a deflection resolution of 15-30 micrometers which
corresponded to a force resolution of 0.5 mN for a 3.315 kg pendulum.
Resonant positions were determined using a Vector Network Analyzer and results were compared with
computational simulations. The best resonance obtained using the cylindrical cavity had a reflection coefficient of
0.05% at the central frequency and a quality of 306. The wide bandwidth and sporadic nature of the output signal
made it difficult to resonate the cavity effectively. Reflected power from frequencies beyond the bandwidth of the
cavity may have caused severe arcing inside the magnetron resulting in an unstable output.
2. II. Project Description
A. Background
The main requirement for an EM Drive, as proposed by previous experimenters, is that it contains an
asymmetric, electromagnetic resonance. The asymmetry is thought to be required in order to create a momentum
differential which will result in a net 'thrust'. Maintaining resonance is required to amplify the energy that is put into
the system. This concept is analogous to a vibrating string whose amplitude can be built up over successive inputs at
a particular frequency. The amount of amplification a resonant cavity can provide is a function of its quality which
depends primarily on the inside surface finish. An asymmetric resonance can take on a variety of mode shapes
which can be described using the conventional cylindrical notation (TE or TM nml). Many have argued that thrust
without mass ejection cannot satisfy conservation of momentum, but experimental results refute this claim.
Furthermore, Dr. White's hypothesis that the EM Drive may be pushing off of quantum vacuum fluctuations has yet
to be disproven.
B. Cylindrical Design
For this experiment, a partially filled, symmetric, resonant cavity was utilized to create an asymmetric
resonance in the axial direction. The advantages of this design over the typical EM Drive frustum shape are
simplicity, adjustability, and power delivery. The first patent published by Roger Shawyer in 1988 consists of a
cylindrical cavity partially filled by a cone-shaped dielectric as seen in Fig. 1.
Figure 1. Roger Shawyer 1988 Patent Design7
. The triangular region on the left side of the cavity is a 2-
dimensional representation of the conical dielectric insert.
Several design iterations were made and the resulting product can be seen in Fig. 2, 3 and 4. This design
features a conducting rod which controls and internal movable plate with a removable dielectric attachment. The
cylindrical cavity has two end adapters welded around the circumference to allow plate attachments for the rod
guide, suspension connection, and magnetron mount. Subsequent VNA testing resulted in a change to the magnetron
mount (not pictured) which will be further discussed. One advantage of this design is that it allows the dielectric to
be spun inside the cavity, thus changing the screw location and the shape and quality of resonance. It was later
discovered that asymmetry could have resulted in a transverse thrust.
3. Figure 2. Final Cylindrical Design.
Figure 3. Expanded View of the Movable Plate for the Final Cylindrical Design. This picture shows the
interconnections between different components in the movable plate system.
4. Figure 4. Expanded View of the Magnetron Input for the Final Cylindrical Design. This picture gives a better
representation of the coupling between the magnetron and the cavity.
The frame seen in Fig. 5 was designed so that it could fit in the Student Vacuum Chamber in the Spacecraft
Environments Laboratory at Cal Poly. Later considerations revealed complications with the magnetron inside the
chamber as well as with deflection measurements, therefore this setup was never attempted. L brackets (not
pictured) were also used to secure each leg to the vibrationally isolated optics table.
Figure 5. Student Vacuum Chamber Pendulum Design. This view shows how the cavity is suspended
from the frame in order to form a single pendulum system.
5. C. Apparatus Calibration
The final apparatus can be seen in Fig. 6. A calibration pulley was used to induce a known force in the axial
direction to measure displacement. A PSM2-10 position sensing device was used in conjunction with an OT-301
amplifier to determine the deflection of a laser. There is an origin for the PSM2-10 and all deflections are measured
relative to this point. A voltage is output by the PSM2-10 and this signal is then amplified by the OT-301 and sent to
a DSO-X 2002A oscilloscope for data acquisition. The higher the voltage seen on the oscilloscope the farther the
laser is from the center of the PSM2-10. Amplifiers can degrade over time therefore prior pendulum testing, the
linearity of the OT-301 amplifier was verified.
Figure 6. Picture of Experimental Setup. The different components of the entire experimental setup are depicted
here, notice the red and black wires used to deliver power to the cavity as well as the blue wire that was used for
grounding purposes.
For this procedure the PSM2-10 was placed on one end of the optics table and a 9 V DC 650 nm laser was
fixed to a micrometer at the opposite end. After recording an initial reading, the position of the laser was
incremented through ± 2 V in both the x and y dimensions. Readings were taken at 50 mV measurement divisions as
well as some at 100 mV divisions. After each increment a data run containing the average and peak to peak voltage
was recorded on the oscilloscope for further analysis in Matlab. After a large number of test runs the data was
plotted and the linearity of the amplifier was examined. Overall the device showed very high linearity and it was
determined that 1V corresponds to almost exactly 1 mm of deflection. After verification of the linearity of the OT-
301, the EM Drive was placed on the pendulum and the effective resolution of the test rig was verified. Fig. 9 shows
the mirror fixture on the back of the pendulum which was used to reflect the laser beam.
6. Figure 9. Detailed Shot of Laser Measurement System. PSM2-10 is labelled as the PSD in this picture
and the white, 9 V DC, 650 nm Laser can be seen at the bottom of the picture.
The typical noise in both the x and y axes was measured and it was determined that ± 2.5 mV for the x axis
and anywhere from ± 7.5-20 mV for the y axis was common for this setup. Afterwards, the pulley system was setup
to determine the accuracy of the equations derived in Appendix B. After connecting the pulley the average noise
increased significantly. This is likely due to the fact that the pendulum on the other side of the pulley couples with
the test rig pendulum to form a double pendulum system. The noise due to spurious effects such as air currents are
therefore amplified and the average noise on x and y axis was ± 20 mV and ± 40 mV respectively.
Initial runs were done using string and a 500 mg (4.9 mN) weight. The calculated force was of the same
order of magnitude as the expected force from the weight, however the percent error between the two values was
substantial for multiple test runs. The calculated thrust relies heavily on the accuracy of the dimensions that are
utilized in the displacement equation, therefore it is likely that small errors in each measurement could have resulted
in a large compounded error value. If the dimensions in the equation are varied by the associated tolerances a
solution can be obtained that corresponds to the appropriate expected thrust value. A graph of the y displacement
can be seen below in Fig. 10.
7. Figure 10. Y Displacement for a 500 mg Weight. This graph depicts the y displacement before and after the
weight is placed on the pulley. The pink line is the average voltage before the weight was added. The blue line
represents the average voltage after the weight is added.
Further test runs were conducted with a 200 mg and 100 mg weight. The results for these test runs are shown in Fig.
11 and12. It is worth noting that more than ten calibration test runs were performed to ensure consistent results.
8. Figure 11. Y Displacement for a 200 mg Weight. This graph depicts the y displacement before and after the
weight is placed on the pulley. The pink line is the average voltage before the weight was added. The blue line
represents the average voltage after the weight is added.
Figure 12. Y Displacement for a 100 mg Weight. This graph depicts the y displacement before and after the
weight is placed on the pulley. The magenta line is the average voltage before the weight was added. The blue line
represents the average voltage after the weight is added, and the green lines depict the peak-to-peak.
In Fig. 13 and 14 it is clear that the equations developed to calculate force from deflection are much more
accurate at small forces. Various different assumptions and small errors in measurement techniques are likely the
cause of the inconsistencies of the thrust prediction equations. This is a large area of concern and will need to be
further examined before more testing can occur.
9. Figure 13. Comparison of Different Thrust Measurement Equations for Large Forces. Three different equations
were derived for thrust measurement. The BK Force Eq. is the exact solution for thrust as a function of deflection
while the KZ Force Eq. and BE Force Eq. both utilize some form of small angle approximations.
Figure 14. Comparison of Different Thrust Measurement for Small Forces.
D. Magnetron Antenna
In order to find positions of resonance, an antenna was used to mimic the output power distribution of the
magnetron. First, a sacrificial magnetron was torn open to discover the optimal method of connection to the center
10. tap wire as seen in Fig. 15. This wire connects the inner resonant cavity of the magnetron to the tip of the antenna
for power output. Next an identical Galanz M24FB-610A was carefully cut open and the tap wire was detached from
the internal spokes of the magnetron so that the length of wire remained the same. The resulting magnetron antenna
can be seen in Fig. 16. Although professionally made antennas exist, this proved to be a cost effective method for
emulating the output power distribution.
Figure 15. Deconstructed Magnetron Cavity with Labels. Here the inner cavity of the magnetron can be seen,
this section is surrounded by the heat sinks and magnets in the intact magnetron at the top of the picture.
Figure 16. Magnetron Antenna for Resonance Testing. This antenna consists of the top ceiling of the magnetron
cavity shown in Fig. 15 as well as the actual magnetron antenna. An SMA connection was soldered to the central
wire of the magnetron for VNA testing.
E. VNA Testing
One of the biggest challenges associated with creating an EM Drive is obtaining resonance. A Vector
Network Analyzer (VNA) was utilized to measure frequencies of resonance inside the cylindrical cavity. The
internal plate was moved axially and spun azimuthally until the VNA displayed a resonance within our magnetron's
bandwidth (2450 MHz ± 30 MHz).
Initial resonance testing seen in Fig. 17 revealed that a waveguide delivery mechanism would be necessary
to improve the reflection from -10 dB to at least -30 dB. This was achieved by cutting out the delivery waveguide
used on the Hamilton Beach Microwave Oven where the Galanz was taken from. This resulted in a solid connection
between the magnetron and waveguide as well as the desired reduction in reflected power.
11. Figure 17. Picture of Experimental Setup for VNA Testing. The VNA can be seen on the left side of the picture,
which was attached to the desktop computer for data acquisition
An attempt was made to balance the energy reflected with the energy amplified in order to create a system
that didn't destroy the source but still amplified the energy enough to see thrust. Several design iterations were
introduced including a rough and polished inner surface as well as many types and thicknesses of dielectric. The
highest quality resonance observed seen in Fig. 18 was achieved using three dielectrics in series from least to
greatest dielectric constant: HDPE, Plexiglas, and Nylon. Unfortunately the polarity of Nylon causes it to heat
dramatically under RF power therefore it was unsuitable for future experiments.
Figure 18. S11 Plot for a Partially Loaded Resonator with HDPE, Plexiglas and Nylon Inserts. Point 4 denotes
the central frequency of the magnetron while point 2 and point 1 are the lower and upper limits of the bandwidth of
the signal. There is a -3 dB offset of the plot in order to better asses the quality of the resonance.
12. This resonance is perfectly situated at the central output frequency of the Galanz magnetron. A reflection of
-33 dB equates to 0.05% of the power at this frequency will be reflected back to the source. The half power
bandwidth of this resonance is approximately 8 MHz resulting in a quality of 306.25. (quality = central frequency
over-3 dB bandwidth) Although in practice resonant cavities can reach qualities in the tens of thousands, a quality of
that magnitude would reflect nearly all energy back into the magnetron. The Smith Chart in Fig. 19 depicts how well
the impedance is matched over the frequency range. Point 4 is within milliohms of the desired 50 Ohm perfect
match. Subsequently, points 2 and 3 are very far from matched which leads to an acceptable quality.
Figure 19. Smith Chart for a Partially Loaded Resonator with HDPE, Plexiglas and Nylon Inserts. Point 4
corresponds to the position of resonance shown in Fig. 18. The distance between Point 4 and the number one
located on the dotted central axis denote a well impedance matched resonance.
In this experiment, the quality was severely limited by the magnetron's output. Because the output has a
relatively wide bandwidth and can be unstable, it is difficult to pair this source with a high quality cavity on the
order of 20,000. A significant portion of the energy delivered to this cavity would be rejected back into the
magnetron which could potentially be damaging. On the other hand, a low quality on the order of 50 would accept
the entire bandwidth of the magnetron (as done by Tajmar et al
5
) but would do little to amplify the energy. Fig. 18
depicts the bandwidth of the resonator and one can clearly see that this sharp position of resonance can not accept all
of the power that is produced across the magnetron's bandwidth. Points 2 and 3, corresponding to the upper and
lower limits of the signal, are well beyond the bandwidth of the resonator.
F. EM Pro Verification
A different resonance using only HDPE was further analyzed in EM Pro to compare the validity of
computer simulations to actual experimental results. Fig. 20 shows the S11 output from EM Pro which matches
exceedingly well to the S11 plot obtained using the VNA seen in Fig. 19. The slight difference in central frequency
can be attributed to the differences in excitation. In order to model the system in EM Pro, a 1 W modal power feed
plane wave excitation was created at an input port identical to the opening of the microwave oven waveguide as seen
in Fig. 21.
13. Figure 19. S11 Plot for a Partially Loaded Resonator with HDPE. Point 1 denotes the central frequency of the
magnetron while point 2 and point 3 are the lower and upper limits of the bandwidth of the signal. There is a -3 dB
offset of the plot in order to better asses the quality of the resonance.
Figure 20. Simulated S11 Chart for a Partially Loaded Resonator with HDPE. This plot can be compared to the
experimental results in Fig. 19.
14. Figure 21. Depiction of the Plane Wave Excitation used to Simulate the Magnetron Source. The color bar in
this picture is used to depict the strength of the electric field at the input to the cavity. Red corresponds to a strong
electric field while the yellow areas indicate a weaker electric field.
The Smith Chart in Fig. 22 exemplifies this source difference and shows that in input impedance around the
central frequency varies dramatically between the plane wave excitation and the magnetron antenna. This is most
likely due to the difference in location that the impedance is being measured.
Figure 22. Simulated Smith Chart for a Partially Loaded Resonator with HDPE Inserts. This plot can be
compared to the experimental results seen in Fig. 19.
15. In Fig. 23 and 24 we can see each figures' respective electric and magnetic field lines with their
corresponding magnitudes and directions. Notice that the strength of the electric field is about three orders larger
than the strength of the magnetic field. This is partially due to an excitation of a transverse magnetic mode which
orients the electric field in the axial direction.
Upon further inspection it can be seen that both fields are compressed within the dielectric due to the high
dielectric constant. This is a key feature of the asymmetric resonance that seems key to producing thrust. The
surface currents can be seen in Fig. 24, which correspond to the associated electric fields. The concentration of
surface currents highlights a key problem with the movable plate design. Due to a lack of connection between the
movable plate and cylindrical cavity, arcing often occurred between the closest edges. Once an electrical connection
was established between the internal plate and the cylinder arcing was mitigated.
Figure 23. Simulated Electric Fields for a Partially Loaded Resonator with HDPE Inserts. The transparent red
sections display the outer walls of the cavity while the orange cylinders depict the screws used to fasten the
dielectric. Colored arrows are used to display the magnitude and direction of the electric fields, higher values appear
red or yellow while weaker values appear green or blue.
16. Figure 24. Simulated Magnetic Fields for a Partially Loaded Resonator with HDPE Inserts. The transparent
red sections display the outer walls of the cavity while the orange cylinders depict the screws used to fasten the
dielectric. Colored arrows are used to display the magnitude and direction of the Magnetic fields, higher values
appear red or yellow while weaker values appear green or blue.
Figure 25. Surface Currents for a Partially Loaded Resonator with HDPE Inserts. Colors are used to display
the magnitude of surface currents, higher values appear red or yellow while weaker values appear green or blue.
G. Results
17. Although the majority of tests resulted in zero deflection, several tests yielded deflections in both
X and Y directions. All of the Y deflections observed were in the direction of the dielectric, and
corresponded to a maximum calculated force of 2.4 mN. The deflection plots for this force can be seen in
Fig. 26. The source of the X deflection was not definitively proven but there may be several effects taking
place. Because the pendulum mirror was not perfectly aligned in the Y direction, as can be seen in Fig. 9,
some of the Y deflection contributed to X deflection, although the magnitude would be a component of
the Y deflection. However the majority of the X displacement most likely came from an asymmetric flow
of current. The cavity was not electrically sealed therefore the current traveled through the suspension
wires to the table, finding the path of least resistance. On the other hand, there could have been an "EM
Drive effect" in a direction that was misaligned with the cylinder axis due to an asymmetric placement of
the screws.
Figure 26. Maximum X and Y Displacements Observed with 1.675 Inches of HDPE The vertical black lines
indicate where the microwave was turned on and off. This test lasted a duration of 12 second.
Many early tests resulted in dramatic RF interference with the PSD which can be seen in Fig. 27. This interference
was eliminated using microwave absorbing sheets around the PSD.
18. Figure 27. Example of X and Y Displacements Observed with 0.99 Inches of HDPE This example was chosen to
illustrate the effect of RF interference on the PSD..
III. Conclusion
Further experimentation must be performed to verify or disprove the functionality of the EM Drive.
Although displacements were observed it is difficult to assert that the displacements were caused by the reported
'thrust' or another spurious effect. Asymmetric current flow could be a major factor in the observed data. An
electromagnetic choke could be used in future experimentation to simplify the grounding requirements associated
with movable components. Furthermore, air currents from thermal effects and the air conditioning system had an
impact on the noise of the signal. Future testing will utilize a vacuum chamber to reduce the impacts of air flow. A
new proposal has been prepared which will address some of the issues outlined above as well as improve upon
various parameters including engineering tolerances, VSWR, quality, and most importantly, power delivery.
Implementing these changes will produce an environment where the validity of the EM Drive can be assessed with
high confidence and accuracy.
Acknowledgements
K. Zeller and B. Kraft would like to thank their advisor, Dr. Echols, for his unyielding support. His encouragement
greatly enhanced their dedication to this endeavor. They would also like to thank the participants on the NASA
Space Forum as well as the various manufacturers who have provided great insight into all facets of the previous
experiments as well as this particular campaign.
References
1
Brady, D. A, White H. G, March P., Lawrence J.T., and Davies F. J., "Anomalous Thrust Production from an
RF Test Device Measured on a Low-Thrust Torsion Pendulum", NASA Lyndon B. Johnson Space Center, Houston,
Texas 77058, July 2014.
2
Juan Y., Yu-Quan W., Yan-Jie M., Peng-Fei L., Le Y., Yang W., and Guo-Qiang H., "Prediction and
Experimental Measurement of the Electromagnetic Thrust Generated by a Microwave Thruster System", College of
Astronautics, Northwestern Polytechnic University, Xi’an 710072, China, Dec 2012.
3
Juan Y., Yu-Quan W., Yan-Jie M., Peng-Fei L., Le Y., Yang W., and Guo-Qiang H., "", College of
Astronautics, Northwestern Polytechnic University, Xi’an 710072, China, Dec 2014.
19. 4
Shawyer R., "The EM Drive-A New Satellite Propulsion Technology", SPR. Ltd., UK.
5
Fetta G., "Numerical and Experimental Results for a Novel Propulsion Technology Requiring no On-Board
Propellant", Cannae LLC., Doylestown PA, 18901, July 2014.
6
Tajmar, M., Fiedler, G., "Direct Thrust Measurements of an EM Drive and an Evaluation of Possible Side-
Effects", Institute of Aerospace Engineering, Technische Universität Dresden, 01062 Dresden, Germany.
7
Shawyer, Roger. 'Electrical Propulsion Unit For Spacecraft'. 1988
Appendices
A: Investigation and Analysis of Anomalous Electromagnetic Propulsion Devices
B: Derivation of Thrust as a Function of Displacement