By completing this presentation will be have a clear idea about Antenna's working principles, Antenna's Types & Antenna's Parameters. At the end to this document you'll have a brief idea about Antenna's Tilt vs Distance Calculation & Cluster wise optimum Antenna Selection procedure. Impact of antenna PIM & VSWR have been described elaborately in this document as well.
A Klystron is a vacuum tube that can be used either as a generator or as an amplifier or as an oscillator, at microwave frequencies.The Klystron is a linear beam device; that is, the electron flow is in a straight line focused by an axial magnetic field.
By completing this presentation will be have a clear idea about Antenna's working principles, Antenna's Types & Antenna's Parameters. At the end to this document you'll have a brief idea about Antenna's Tilt vs Distance Calculation & Cluster wise optimum Antenna Selection procedure. Impact of antenna PIM & VSWR have been described elaborately in this document as well.
A Klystron is a vacuum tube that can be used either as a generator or as an amplifier or as an oscillator, at microwave frequencies.The Klystron is a linear beam device; that is, the electron flow is in a straight line focused by an axial magnetic field.
hello readers i give my PPT presentation for about antenna and ther properties and working explain in this ppt
i hope you like it THANK YOU.......!!!!!!!
An Antenna is a transducer, which converts electrical power into electromagnetic waves and vice versa.
An Antenna can be used either as a transmitting antenna or a receiving antenna.
A transmitting antenna is one, which converts electrical signals into electromagnetic waves and radiates them.
A receiving antenna is one, which converts electromagnetic waves from the received beam into electrical signals.
In two-way communication, the same antenna can be used for both transmission and reception.
Basic Parameters
Frequency
Wavelength
Impedance matching
VSWR & reflected power
Bandwidth
Percentage bandwidth
Radiation intensity.
A horn antenna or microwave horn is an antenna that consists of a flaring metal waveguide shaped like a horn to direct radio waves in a beam. Horns are widely used as antennas at UHF and microwave frequencies, above 300 MHz.
hello readers i give my PPT presentation for about antenna and ther properties and working explain in this ppt
i hope you like it THANK YOU.......!!!!!!!
An Antenna is a transducer, which converts electrical power into electromagnetic waves and vice versa.
An Antenna can be used either as a transmitting antenna or a receiving antenna.
A transmitting antenna is one, which converts electrical signals into electromagnetic waves and radiates them.
A receiving antenna is one, which converts electromagnetic waves from the received beam into electrical signals.
In two-way communication, the same antenna can be used for both transmission and reception.
Basic Parameters
Frequency
Wavelength
Impedance matching
VSWR & reflected power
Bandwidth
Percentage bandwidth
Radiation intensity.
A horn antenna or microwave horn is an antenna that consists of a flaring metal waveguide shaped like a horn to direct radio waves in a beam. Horns are widely used as antennas at UHF and microwave frequencies, above 300 MHz.
Antenna to transmit and receive wireless electromagnetic waves, how does the transmitting and receiving antenna work?
Any radio frequency equipment cannot work without an antenna, which is responsible for transmitting and receiving electromagnetic radiation, or electromagnetic waves from the air.
In the transmitting direction, the antenna can convert the high-frequency current signal generated by the radio frequency equipment into electromagnetic waves, and transmit them into the air for propagation.
In the receiving direction, the antenna can capture electromagnetic waves in the air and convert the electromagnetic waves into high-frequency current signals inside the radio frequency equipment.
This article will disassemble the basic principles of electromagnetic waves, the basic principles of transmitting and receiving antennas, the transmission and reception of electromagnetic waves by wireless terminal equipment transmitting and receiving antennas, and common transmitting and receiving antenna parameters.
Welcome to WIPAC Monthly the magazine brought to you by the LinkedIn Group Water Industry Process Automation & Control.
In this month's edition, along with this month's industry news to celebrate the 13 years since the group was created we have articles including
A case study of the used of Advanced Process Control at the Wastewater Treatment works at Lleida in Spain
A look back on an article on smart wastewater networks in order to see how the industry has measured up in the interim around the adoption of Digital Transformation in the Water Industry.
Forklift Classes Overview by Intella PartsIntella Parts
Discover the different forklift classes and their specific applications. Learn how to choose the right forklift for your needs to ensure safety, efficiency, and compliance in your operations.
For more technical information, visit our website https://intellaparts.com
Vaccine management system project report documentation..pdfKamal Acharya
The Division of Vaccine and Immunization is facing increasing difficulty monitoring vaccines and other commodities distribution once they have been distributed from the national stores. With the introduction of new vaccines, more challenges have been anticipated with this additions posing serious threat to the already over strained vaccine supply chain system in Kenya.
Quality defects in TMT Bars, Possible causes and Potential Solutions.PrashantGoswami42
Maintaining high-quality standards in the production of TMT bars is crucial for ensuring structural integrity in construction. Addressing common defects through careful monitoring, standardized processes, and advanced technology can significantly improve the quality of TMT bars. Continuous training and adherence to quality control measures will also play a pivotal role in minimizing these defects.
COLLEGE BUS MANAGEMENT SYSTEM PROJECT REPORT.pdfKamal Acharya
The College Bus Management system is completely developed by Visual Basic .NET Version. The application is connect with most secured database language MS SQL Server. The application is develop by using best combination of front-end and back-end languages. The application is totally design like flat user interface. This flat user interface is more attractive user interface in 2017. The application is gives more important to the system functionality. The application is to manage the student’s details, driver’s details, bus details, bus route details, bus fees details and more. The application has only one unit for admin. The admin can manage the entire application. The admin can login into the application by using username and password of the admin. The application is develop for big and small colleges. It is more user friendly for non-computer person. Even they can easily learn how to manage the application within hours. The application is more secure by the admin. The system will give an effective output for the VB.Net and SQL Server given as input to the system. The compiled java program given as input to the system, after scanning the program will generate different reports. The application generates the report for users. The admin can view and download the report of the data. The application deliver the excel format reports. Because, excel formatted reports is very easy to understand the income and expense of the college bus. This application is mainly develop for windows operating system users. In 2017, 73% of people enterprises are using windows operating system. So the application will easily install for all the windows operating system users. The application-developed size is very low. The application consumes very low space in disk. Therefore, the user can allocate very minimum local disk space for this application.
Saudi Arabia stands as a titan in the global energy landscape, renowned for its abundant oil and gas resources. It's the largest exporter of petroleum and holds some of the world's most significant reserves. Let's delve into the top 10 oil and gas projects shaping Saudi Arabia's energy future in 2024.
Courier management system project report.pdfKamal Acharya
It is now-a-days very important for the people to send or receive articles like imported furniture, electronic items, gifts, business goods and the like. People depend vastly on different transport systems which mostly use the manual way of receiving and delivering the articles. There is no way to track the articles till they are received and there is no way to let the customer know what happened in transit, once he booked some articles. In such a situation, we need a system which completely computerizes the cargo activities including time to time tracking of the articles sent. This need is fulfilled by Courier Management System software which is online software for the cargo management people that enables them to receive the goods from a source and send them to a required destination and track their status from time to time.
Immunizing Image Classifiers Against Localized Adversary Attacksgerogepatton
This paper addresses the vulnerability of deep learning models, particularly convolutional neural networks
(CNN)s, to adversarial attacks and presents a proactive training technique designed to counter them. We
introduce a novel volumization algorithm, which transforms 2D images into 3D volumetric representations.
When combined with 3D convolution and deep curriculum learning optimization (CLO), itsignificantly improves
the immunity of models against localized universal attacks by up to 40%. We evaluate our proposed approach
using contemporary CNN architectures and the modified Canadian Institute for Advanced Research (CIFAR-10
and CIFAR-100) and ImageNet Large Scale Visual Recognition Challenge (ILSVRC12) datasets, showcasing
accuracy improvements over previous techniques. The results indicate that the combination of the volumetric
input and curriculum learning holds significant promise for mitigating adversarial attacks without necessitating
adversary training.
Democratizing Fuzzing at Scale by Abhishek Aryaabh.arya
Presented at NUS: Fuzzing and Software Security Summer School 2024
This keynote talks about the democratization of fuzzing at scale, highlighting the collaboration between open source communities, academia, and industry to advance the field of fuzzing. It delves into the history of fuzzing, the development of scalable fuzzing platforms, and the empowerment of community-driven research. The talk will further discuss recent advancements leveraging AI/ML and offer insights into the future evolution of the fuzzing landscape.
2. TWT
Travelling wave tubes are broadband microwave devices which
have no cavity resonators like Klystrons.
Amplification is done through the prolonged interaction between
an electron beam and Radio Frequency RF field.
3. PRINCIPLE
◦ Electrons emitted from the cathode are accelerated by a potential difference between the cathode and the anode. An electron beam is
formed and focused in the electron gun region to be injected into the slow-wave circuit where it interacts with the propagating RF wave.
◦ The axial phase velocity of the RF wave is delayed by the slow-wave circuit such that it is almost the same velocity as the electron beam.
Upon injection into the input section of the RF circuit, the electron beam is velocity-modulated.
◦ As it passes through the RF circuit, the velocity-modulation in the electron beam changes gradually to density-modulation, and then induces
an amplified RF wave at the output section of the slow-wave circuit. The role of the RF attenuator placed in the center portion of the slow-
wave circuit is to prevent feedback oscillation in the TWT.
◦ After passing over the slow-wave circuit, the electron beam reaches the collector, and the electron energy is converted to heat and
dissipated.
4. CONSTRUCTION
◦ Travelling wave tube is a cylindrical structure which contains an electron gun from a cathode tube. It has anode plates, helix
and a collector. RF input is sent to one end of the helix and the output is drawn from the other end of the helix.
◦ An electron gun focusses an electron beam with the velocity of light. A magnetic field guides the beam to focus, without
scattering. The RF field also propagates with the velocity of light which is retarded by a helix.
◦ Helix acts as a slow wave structure. Applied RF field propagated in helix, produces an electric field at the center of the
helix.
◦ The resultant electric field due to applied RF signal, travels with the velocity of light multiplied by the ratio of helix pitch to
helix circumference. The velocity of electron beam, travelling through the helix, induces energy to the RF waves on the helix
5. The following figure explains the constructional features of a
travelling wave tube.
6. CONSTRUCTION
◦ Thus, the amplified output is obtained at the output of TWT. The axial phase velocity Vp is represented as
Vp=Vc(Pitch/2πr)
◦ Where r is the radius of the helix. As the helix provides least change in Vp phase velocity, it is preferred over other slow wave structures for
TWT. In TWT, the electron gun focuses the electron beam, in the gap between the anode plates, to the helix, which is then collected at the
collector.
7. The following figure explains the electrode
arrangements in a travelling wave tube.
8. OPERATION
◦ The anode plates, when at zero potential, which means when the axial electric field is at a node, the electron beam velocity remains
unaffected. When the wave on the axial electric field is at positive antinode, the electron from the electron beam moves in the opposite
direction.
◦ This electron being accelerated, tries to catch up with the late electron, which encounters the node of the RF axial field.
◦ At the point, where the RF axial field is at negative antinode, the electron referred earlier, tries to overtake due to the negative field effect.
The electrons receive modulated velocity.
◦ As a cumulative result, a second wave is induced in the helix. The output becomes larger than the input and results in amplification.
9. APPLICATIONS
◦ TWT is used in microwave receivers as a low noise RF amplifier.
◦ TWTs are also used in wide-band communication links and co-axial cables as repeater amplifiers or intermediate amplifiers to amplify low
signals.
◦ TWTs have a long tube life, due to which they are used as power output tubes in communication satellites.
◦ Continuous wave high power TWTs are used in Troposcatter links, because of large power and large bandwidths, to scatter to large
distances.
◦ TWTs are used in high power pulsed radars and ground based radars.