DIPOLE PLANAR ARRAY
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The document describes the design and simulation of a 3x4 dipole planar array antenna. Key objectives of the antenna include studying its radiation properties, frequency response, gain, and radiation patterns. The antenna is designed to operate at 3.3 GHz using dipole elements that are half the wavelength in length, spaced at intervals of one-twentieth the wavelength, and placed on a 1.6 mm thick substrate. Simulation results show the antenna achieves good impedance matching and a maximum gain of around 6.35dB within the target frequency band, along with the desired radiation pattern.
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This document discusses different types of antennas and their applications. It covers tower types, common antenna designs like dipole, monopole, patch and parabolic antennas. Key antenna concepts discussed include directionality, gain, bandwidth and radiation patterns. Specific applications mentioned include wireless communications, radio transmission from towers, and the US Navy's extremely low frequency system for communicating with submarines.
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Log periodic antennas are broadband antennas with multiple dipole elements of varying lengths arranged logarithmically. This allows them to radiate across a wide frequency range. They have moderate directivity compared to other directional antennas. The individual dipole elements are excited through cross connections, and the point of excitation can be varied to change the radiation pattern. Log periodic antennas are used when both wide frequency coverage and some directivity are needed, such as in television antennas.
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An array antenna uses multiple antenna elements to increase directivity and gain over a single element. It allows controlling the radiation pattern through configuration of elements, their excitation amplitude and phase. A linear array's far-field pattern is determined by its array factor, which is calculated based on number of elements, their spacing and excitation. Common array types include uniform linear arrays and end-fire/broadside arrays. The total pattern is obtained by multiplying the array factor and single element pattern. Arrays find applications in mobile communication base stations, TV reception and more.
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A Yagi-Uda array consists of an array of dipoles with one directly excited dipole and additional parasitic dipoles that are parasitically coupled. The parasitic elements influence the radiation pattern depending on their length and spacing from the driven dipole. A director element, which is shorter than the driven element, increases forward directivity, while a reflector element, which is longer, increases backward directivity. Increasing the number of directors can further increase the directivity of the Yagi-Uda array.
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The document discusses different types of antennas used in wireless communication. It describes antennas such as dipole antennas, horn antennas, parabolic dish antennas, and antenna arrays. Dipole antennas are simple and widely used. They consist of two conductive elements that transmit and receive electromagnetic waves. Horn antennas guide radio waves into a beam but have limited directivity. Parabolic dish antennas have high gain and directivity due to their distinctive parabolic shape. Antenna arrays combine the radiation patterns of individual antenna elements to provide benefits such as high gain and directivity.
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This document presents the design of a dual-band electrically small microstrip antenna with folded dipole slots for C and X band applications. A rectangular probe-fed microstrip patch antenna is designed using Rogers RT/duroid 5880 as the substrate. Slots are placed in the patch to form a folded dipole structure, which increases the bandwidth. Parameters like return loss, gain, radiation patterns, surface currents and E/H fields are simulated using HFSS. The antenna achieves return losses of -17.13dB and -18.81dB at 6.31GHz and 11.08GHz respectively, with a maximum gain of 8.1dB. The proposed antenna design can be used for applications requiring operation in C
Antenna Types and their impact on the comn sys.pptx
- Antennas come in different types based on frequency range, operating range, mode of application, and physical structure. Common types include wire antennas, slot/aperture antennas, reflector/lens antennas, and microstrip antennas.
- Key antenna parameters that impact communication systems include radiation pattern, impedance, bandwidth, gain, efficiency, directivity, and polarization. Proper impedance matching between the antenna and transmission line is important for maximum power transfer. A high gain antenna directs radiation more effectively in a desired direction.
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This document provides an overview of antennas and wave propagation. It defines an antenna as an electrical conductor that radiates or receives electromagnetic waves. Key antenna parameters discussed include radiation pattern, beam area, directivity, gain, and radiation resistance. Common antenna types like dipoles, loops, and arrays are examined. The document also covers topics such as effective aperture, polarization, and the radiation characteristics of half-wave dipoles and Yagi-Uda antennas.
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The document discusses the Yagi-Uda antenna, which consists of a driven element connected to a transmitter or receiver, along with multiple parasitic elements called reflectors and directors that help direct radio waves. It operates based on the principle that elements of specific lengths resonate at particular frequencies. The reflector is longer than the driven element to reflect waves forward, while progressively shorter directors increase directivity. Yagi-Uda antennas are commonly used for television reception due to their high gain and directionality over long distances.
Types of microstrip antenna
Microstrip antennas come in various types based on their feeding mechanism, patch shape, operating frequency, and bandwidth. The main types include microstrip patch antennas, microstrip dipole antennas, printed slot antennas, and microstrip traveling wave antennas. Printed slot antennas comprise a slot in the ground plane of a grounded substrate and can take any shape. They are typically bidirectional radiators but can be made unidirectional using a reflected plate. Microstrip dipole antennas simply consist of two lengths of metal arranged end to end with feed in the middle. Microstrip traveling wave antennas support transverse wave propagation along periodic microstrip lines or long segments.
AWP PPT.pdf
This document provides an overview of basic antenna theory concepts. It begins with an outline that reviews basic antenna types like monopoles, slots, patches and reflector antennas. It then discusses topics like radiation patterns, gain, polarization, equivalent circuits and efficiency. The document provides examples of different antenna types and applications. It explains key antenna concepts such as radiation patterns, power patterns versus field patterns, and principal patterns. Overall, the document serves as an introduction to refresh fundamental concepts in antenna physics.
Classification of antenna
The document discusses different types of antennas used for radio transmission and reception. It categorizes antennas into several groups: log periodic antennas, wire antennas, travelling wave antennas, microwave antennas, and reflector antennas. Within each category, specific antenna types are described, including their basic design and purpose. Key antenna types mentioned include dipole antennas, monopole antennas, Yagi-Uda arrays, parabolic reflectors, horn antennas, and slot antennas.
Microstrip rectangular patch antenna
The document discusses reducing the size of planar microstrip antennas by varying slit dimensions. It aims to reduce antenna size and increase efficiency and gain. It analyzes different methods to reduce antenna size and identifies slot loading the patch as the best solution. Three antenna designs with different slit configurations are proposed, simulated, and tested. Results show the designs reduce antenna size by up to 8% while maintaining performance.
RADIO ENGINEERING Week 9 Lecture 9 various types of antenna
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DIPOLE PLANAR ARRAY
- 1. 3×4 DIPOLE PLANAR ARRAY DESIGN AND SIMULATION Vengalam Mahendra
- 2. AIM • The aim is to design and simulate 3 × 4 dipole planar array and study the radiation properties and frequency responses through antenna parameter wavelength.
- 3. Technical objective • There are several important antenna characteristics that should be considered when choosing an antenna for your application as follows: 1).Antenna radiation patterns 2).Gain 3).Frequency response
- 4. DESCRIPTION • Half wave dipole antenna consists of two identical conductive elements such as metal rods which are bilaterally symmetrical. The "half-wave" term means that the length of this dipole antenna is equal to a half-wavelength at the frequency of operation. • It is basically fed in the center where the impedance falls to lowest. The voltage and current levels vary along the length of the radiating section of the antenna. For a dipole antenna that is an electrical half wavelength long, the inductive and capacitive reactance cancel each other and the antenna becomes resonant.
- 5. DESIGN • To design 3×4 dipole planar array antenna • By Putting dipoles into an array is used to increase the directional gain of the resulting array beyond the small gain of a single dipole element.
- 6. SIMULATION Designed for 3.3 GHz operation on a substrate with 1.6 mm thickness. λ=90.9mm 𝑓 = 𝑐 λ where c=3*1010mm
- 7. DESIGN FABRICATION • Length of dipole = λ 4 • Width of dipole = λ 20 • Spacing between dipoles = λ 20
- 10. CONCLUSION • Within the 3.3 GHz band, the proposed antenna shows good impedance matching and the measured antenna gain reaches about 6.35dB . • Achieved desired radiation pattern