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Author : 李威蔚
Publisher :
ISBN 13 :
Total Pages : 112 pages
Book Rating : 4.:/5 (112 download)
Download or read book Omnidirectional Dielectric Resonator Antennas for Achieving Circularly Polarized Diversity written by 李威蔚 and published by . This book was released on 2014 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Raghvendra Kumar Chaudhary
Publisher : Artech House
ISBN 13 : 1630818186
Total Pages : 310 pages
Book Rating : 4.6/5 (38 download)
Download or read book Circularly Polarized Dielectric Resonator Antennas written by Raghvendra Kumar Chaudhary and published by Artech House. This book was released on 2021-08-31 with total page 310 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book introduces 5 key feeding techniques such as coaxial probe, microstrip, conformal strip, aperture, and coplanar waveguide and covers different shapes of dielectric resonator antennas leading to improvement in circularly polarized (CP) performance. It introduces advancements in the field of dielectric resonator antennas and dilectric resonator antennas (DRAs). Five different types of feeding techniques (i.e. coaxial probe, microstrip, conformal strip, aperture, and coplanar waveguide) are described for obtaining CP followed by two modified shaped DRA (sector DRAs). Throughout this book, rectangular and circular with their modified shapes of the dielectric resonator are utilized, providing differing degrees of freedom as well as different variable parameters, including length, width, height, radius, aspect ratio and dielectric constant, which are tuned to obtain the desired antenna parameters.
Author :
Publisher : Walter de Gruyter GmbH & Co KG
ISBN 13 : 3110562804
Total Pages : 353 pages
Book Rating : 4.1/5 (15 download)
Download or read book Circularly Polarized Antenna Technology written by and published by Walter de Gruyter GmbH & Co KG. This book was released on 2020-11-23 with total page 353 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book presents basic and advanced concepts of circularly polarized antennas, including design procedure and recent applications. Cross dipole antennas, microstrip antennas, helical antennas, quadrifilar helix antennas, frequency independent antennas, horn antennas, omnidirectional circularly polarized antennas and radial line arry antennas are discussed. With abundant examples, the book is an essential reference for researchers and engineers.
Author : Vijay Janyani
Publisher : Springer
ISBN 13 : 9811073953
Total Pages : 706 pages
Book Rating : 4.8/5 (11 download)
Download or read book Optical and Wireless Technologies written by Vijay Janyani and published by Springer. This book was released on 2018-02-12 with total page 706 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents selected papers from 1st International Conference on Optical and Wireless Technologies, providing insights into the analytical, experimental, and developmental aspects of systems, techniques, and devices in these spheres. It explores the combined use of various optical and wireless technologies in next-generation networking applications, and discusses the latest developments in applications such as photonics, high-speed communication systems and networks, visible light communication, nanophotonics, and wireless and multiple-input-multiple-output (MIMO) systems. The book will serve as a valuable reference resource for academics and researchers across the globe.
Author : Laila K. Hady
Publisher :
ISBN 13 :
Total Pages : 216 pages
Book Rating : 4.:/5 (747 download)
Download or read book Multi-functional Use of Cylindrical Dielectric Resonator for Microwave Circuits and Antenna Applications written by Laila K. Hady and published by . This book was released on 2009 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt: The main objective of this PhD dissertation is to investigate the ability of utilizing a single cylindrical dielectric resonator in realizing multi-functional devices to be used for filtering, oscillating as well as radiating purposes by exciting multi-independent modes simultaneously. The complete work is devoted in three main categories or contributions. First contribution is mainly working on the use of dielectric resonators in multi-function realizations. A design of dielectric resonator antenna in a polarization filtering cavity for dual function applications is studied where a cylindrical dielectric resonator is enclosed by a hypothetical resonant cavity that acts as a shielding for the resonating mode while transparent for the radiating mode. A possible application of this device is a receiving antenna at the frequency of the radiating mode and can incorporate a local oscillator operating at the resonant frequency of the resonating mode. Moreover, a design of dielectric resonator antenna for GPS and WLAN applications is introduced where both a broadside circularly-polarized antenna and an omni-directional antenna are obtained simultaneously by exciting two independent modes. Since the previous work dealt with the dual use of a dielectric resonator, a new challenge was to go for the triplet functioning. Therefore, part of the work is devoted to study the triple mode operation using a single dielectric resonator for filtering and radiating purposes. The design utilized the dielectric resonator simultaneously as a dual band radiator and as a filter operating for the lower frequency radiating mode band. Traditionally, mechanical direction finding antennas were built with either loop or dipole antenna elements. In radar applications, spiral and horn antennas have been used for the precision direction finding. The second contribution of this dissertation work is studying the use of dielectric resonator antennas in the design of direction finding systems. The direction finding operation is achieved by comparing the received signal with the two generated dielectric resonator antenna patterns. Those patterns are obtained by exciting certain mode through two different ports, once out of phase and once in phase, to produce a broadside type and a monopole type of radiation patterns. Because of its small size, the DRA can be used for an approximate hand-held target tracking, but it could also be used as a feed for reflector antenna for an accurate direction finding in point-to-point applications. The intended application of this antenna is to track a position of a source of radiation. Since the previous parts of the dissertation work are mainly all about the implementation of multi-functional devices with a single dielectric resonator, it was of interest to investigate the use of higher order modes and explore the ability of incorporating such modes in the implementation of new microwave devices. Cylindrical dielectric resonators sustain high-Q electromagnetic modes called "Whispering Gallery Modes" (WGMs). Such high order modes have attracted the attention due to their intensive applications in quantum electrodynamics (QEM), photonics, and telecommunications. The third contribution of this dissertation is mainly studying the ability to excite a WGM transverse magnetic type of mode and use it for the realization of an equally distributed power dividers to be used later in the feeding of antenna array. An X-band WGM excited dielectric resonator enclosed by a cylindrical cavity was designed built and measured to perform as a 5-way uniformly distributed power divider. The excitation of the transverse magnetic WGH 3,1,1 mode was carried out by using microstrip feeding technology integrated with electric probe coupling technique or magnetic slot coupling for different design realizations.
Author : Kwai Man Luk
Publisher : Research Studies Press Limited
ISBN 13 : 9780863802638
Total Pages : 0 pages
Book Rating : 4.8/5 (26 download)
Download or read book Dielectric Resonator Antennas written by Kwai Man Luk and published by Research Studies Press Limited. This book was released on 2003 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The use of dielectric resonator as a resonant antenna was proposed in 1983. Due to the absence of metallic loss, the dielectric resonator antenna (DRA) is highly efficient when operated at millimetre wave frequencies. With the use of high dielectric constant material, the DRA can also be used as a small and low profile antenna operated at low microwave frequencies. Low cost dielectric materials are now easily available commercially, encouraging more antenna engineers to design communication systems with DRAs.
Author : Zhijiao Chen
Publisher : John Wiley & Sons
ISBN 13 : 1394169140
Total Pages : 325 pages
Book Rating : 4.3/5 (941 download)
Download or read book Dielectric Resonator Antennas written by Zhijiao Chen and published by John Wiley & Sons. This book was released on 2023-12-19 with total page 325 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dielectric Resonator Antennas A detailed guide to dielectric-based techniques for antenna array design and construction Dielectric designs, which transmit electricity without conducting it, have in recent decades been increasingly incorporated into antenna arrays. The resulting Dielectric Resonator Antennas (DRAs) provide significant benefits over metal antennas, avoiding conduction loss and increasing efficiency. Dielectric elements can also be incorporated into metal antennas to improve performance. Dielectric Resonator Antennas provides an introduction to dielectric-based techniques for manufacturing antenna arrays. It supplies guidelines for identifying dielectric antenna designs (as opposed to metal ones), describes recent developments in dielectric antenna technology, and points toward potential areas of future growth and development. Readers will also find: Cutting-edge DRA applications in microwave and millimeter-wave communications Detailed discussion of array types including wideband, high-gain, high efficiency, and more Instructions for fabricating dielectric antenna arrays and assessing tolerance levels Dielectric Resonator Antennas is ideal for researchers and students in electrical engineering, as well as for engineers and others working in wireless communications.
Author : Faith A. Morrison
Publisher : Cambridge University Press
ISBN 13 : 1107003539
Total Pages : 945 pages
Book Rating : 4.1/5 (7 download)
Download or read book An Introduction to Fluid Mechanics written by Faith A. Morrison and published by Cambridge University Press. This book was released on 2013-04-15 with total page 945 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Why Study Fluid Mechanics? 1.1 Getting Motivated Flows are beautiful and complex. A swollen creek tumbles over rocks and through crevasses, swirling and foaming. A child plays with sticky tafy, stretching and reshaping the candy as she pulls it and twist it in various ways. Both the water and the tafy are fluids, and their motions are governed by the laws of nature. Our goal is to introduce the reader to the analysis of flows using the laws of physics and the language of mathematics. On mastering this material, the reader becomes able to harness flow to practical ends or to create beauty through fluid design. In this text we delve deeply into the mathematical analysis of flows, but before beginning, it is reasonable to ask if it is necessary to make this significant mathematical effort. After all, we can appreciate a flowing stream without understanding why it behaves as it does. We can also operate machines that rely on fluid behavior - drive a car for exam- 15 behavior? mathematical analysis. ple - without understanding the fluid dynamics of the engine, and we can even repair and maintain engines, piping networks, and other complex systems without having studied the mathematics of flow What is the purpose, then, of learning to mathematically describe fluid The answer to this question is quite practical: knowing the patterns fluids form and why they are formed, and knowing the stresses fluids generate and why they are generated is essential to designing and optimizing modern systems and devices. While the ancients designed wells and irrigation systems without calculations, we can avoid the wastefulness and tediousness of the trial-and-error process by using mathematical models"--
Author : Amir Hussain
Publisher : CRC Press
ISBN 13 : 1315682109
Total Pages : 1868 pages
Book Rating : 4.3/5 (156 download)
Download or read book Electronics, Communications and Networks IV written by Amir Hussain and published by CRC Press. This book was released on 2015-07-01 with total page 1868 pages. Available in PDF, EPUB and Kindle. Book excerpt: The 4th International Conference on Electronic, Communications and Networks (CECNet2014) inherits the fruitfulness of the past three conferences and lays a foundation for the forthcoming next year in Shanghai. CECNet2014 was hosted by Hubei University of Science and Technology, China, with the main objective of providing a comprehensive global foru
Download or read book Circularly Polarized Rectangular Dielectric Resonator Antennas for Personal Communications written by and published by . This book was released on 1996 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Binod Kumar Kanaujia
Publisher : CRC Press
ISBN 13 : 1000218279
Total Pages : 488 pages
Book Rating : 4.0/5 (2 download)
Download or read book Printed Antennas written by Binod Kumar Kanaujia and published by CRC Press. This book was released on 2020-11-22 with total page 488 pages. Available in PDF, EPUB and Kindle. Book excerpt: Printed antennas have become an integral part of next-generation wireless communications and have been found to be commonly used to improve system capacity, data rate, reliability, etc. This book covers theory, design techniques, and the chronological regression of the printed antennas for various applications. This book will provide readers with the basic conceptual knowledge about antennas along with advanced techniques for antenna design. It covers a variety of analytical techniques and their CAD applications and discusses new applications of printed antenna technology such as sensing. The authors also present special reconfigurable antennas such as ME dipole, polarization, feeding, and DGS. The book will be useful to students as an introduction to design and applications of antennas. Additionally, experienced researchers in this field will find this book a ready reference and benefit from the techniques of research in printed antennas included in this book. Following are some of the salient features of this book: Covers a variety of analytical techniques and their CAD applications Discusses new applications of printed antenna technology such as sensing Examines the state of design techniques of printed antenna Presents special reconfigurable antennas such as ME dipole, polarization, feeding, and DGS
Author : Steven Shichang Gao
Publisher : John Wiley & Sons
ISBN 13 : 111837441X
Total Pages : 341 pages
Book Rating : 4.1/5 (183 download)
Download or read book Circularly Polarized Antennas written by Steven Shichang Gao and published by John Wiley & Sons. This book was released on 2014-02-03 with total page 341 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents a comprehensive insight into the design techniques for different types of CP antenna elements and arrays In this book, the authors address a broad range of topics on circularly polarized (CP) antennas. Firstly, it introduces to the reader basic principles, design techniques and characteristics of various types of CP antennas, such as CP patch antennas, CP helix antennas, quadrifilar helix antennas (QHA), printed quadrifilar helix antennas (PQHA), spiral antenna, CP slot antennas, CP dielectric resonator antennas, loop antennas, crossed dipoles, monopoles and CP horns. Advanced designs such as small-size CP antennas, broadband, wideband and ultra-wideband CP antennas are also discussed, as well as multi-band CP antennas and dual CP antennas. The design and analysis of different types of CP array antennas such as broadband CP patch arrays, dual-band CP arrays, CP printed slot arrays, single-band and multi-band CP reflectarrays, high-gain CP waveguide slot antennas, CP dielectric resonator antenna arrays, CP active arrays, millimetre-waveband CP arrays in LTCC, and CP arrays with electronically beam-switching or beam-steering capabilities are described in detail. Case studies are provided to illustrate the design and implementation of CP antennas in practical scenarios such as dual-band Global Navigation Satellite Systems (GNSS) receivers, satellite communication mobile terminals at the S-band, Radio Frequency Identification (RFID) readers at 2.4 GHz, and Ka-band high-speed satellite communication applications. It also includes the detailed designs for a wideband Logarithmic spiral antenna that can operate from 3.4-7.7 GHz. In addition, the book offers a detailed review of the recent developments of different types of CP antennas and arrays. Presents comprehensive discussions of design techniques for different types of CP antennas: small-size CP antennas, broadband CP antennas, multi-band CP antennas and CP arrays. Covers a wide range of antenna technologies such as microstrip antennas, helix, quadrifilar helix antenna, printed quadrifilar helix antenna, dielectric resonator antennas, printed slots, spiral antennas, monopoles, waveguide slot arrays, reflectarrays, active arrays, millimetre-wave arrays in LTCC, electronically beam-switching arrays and electronically beam-steerable arrays. Reviews recent developments in different types of CP antennas and arrays, reported by industries, researchers and academics worldwide. Includes numerous case studies to demonstrate how to design and implement different CP antennas in practical scenarios. Provides both an introduction for students in the field and an in-depth reference for antenna/RF engineers who work on the development of CP antennas. Circularly Polarized Antennas will be an invaluable guide for researchers in R&D organizations; system engineers (antenna, telecom, space and satellite); postgraduates studying the subjects of antenna and propagation, electromagnetics, RF/microwave/millimetre-wave systems, satellite communications and so on; technical managers and professionals in the areas of antennas and propagation.
Author : Mohammad Abdul Matin
Publisher : BoD – Books on Demand
ISBN 13 : 9535129252
Total Pages : 222 pages
Book Rating : 4.5/5 (351 download)
Download or read book Modern Antenna Systems written by Mohammad Abdul Matin and published by BoD – Books on Demand. This book was released on 2017-02-22 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt: The field of antenna engineering has been advancing at a remarkable pace to support modern communication systems. Recently, significant progress has been made in the development of new antennas and techniques targeted for applications in medical, defense, health care, communication, etc. The motivation of this project is to present cutting-edge research materials in the field of antennas for modern wireless communication.
Author : Mohamad Ismail Sulaiman
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (862 download)
Download or read book Design and Analysis of Singly-fed Dielectric Resonator Antennas with a Wideband Circular Polarization written by Mohamad Ismail Sulaiman and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The proliferation of mobile communications technology increases the demands for faster and more robust services, in addition to the ever decreasing sizes of antennas. These demands can be satisfied using circularly polarized (CP) dielectric resonator antennas (DRAs) exhibiting wide operational bandwidth capability. By utilizing such antennas, the probability of linking the transmitted and received signals is higher, and the system is more reliable since the CP wave is transmitted in all planes and less susceptible to unwanted reflections and absorptions. As CP system is insensitive to the transmitter and receiver orientation, the time consuming practice of continuously aligning the antennas can be avoided. Furthermore, the antennas profile can be reduced simply by using dielectric material with higher permittivity. The thesis focuses on the design and analysis of singly-fed regular-shaped DRAs with a wideband circular polarization. Two new single-point excitation schemes that can be easily used to excite an arbitrarily shaped DRA are introduced, where a square spiral and a rectangular open half-loop are used for DRA excitation. These proposed feeding methods are based on employing conformal conducting metal strips that are placed on the DRA surface. Additionally, two different approaches are employed onto the DRA design to enhance the CP bandwidth. The first approach is based on using a multilayer dielectric, and the second introduces a parasitic half-loop inside the feeding element. The generated broad CP bands have been achieved in conjunction with sufficient impedance matching bandwidths. The studied geometries have been modeled using a comprehensive self developed MoM code that employs the volume surface integral equation (VSIE). The computed results have been validated against those obtained from measurements as well as CST microwave studio simulations. Theoretical and experimental results demonstrate a several folds enhancement in the CP bandwidths compared to those reported in the literature for identical DRA geometries.
Author : Junping Geng
Publisher : Springer
ISBN 13 : 9789811590917
Total Pages : 170 pages
Book Rating : 4.5/5 (99 download)
Download or read book Omnidirectional Slots Antenna written by Junping Geng and published by Springer. This book was released on 2021-12-05 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt: Omnidirectional antenna with high gain, low profile, vertical polarization, even CP polarization is very difficult to design, although it is from the dipole. In this book, a novel idea that the running wave in the coaxial wire is disturbed by the orthogonal slot array on the cylindrical metal shell is introduced, which radiates the CP wave in omni-direction. When feeding on two ends of the coaxial wire respectively, there will appear left hand circularly polarized (LHCP) omnidirectional radiation or right hand circularly polarized (RHCP) omnidirectional radiation. By introducing the T-shaped feed structure, the coaxial wire with slot array can conveniently produce the LHCP and RHCP radiation diversity with one end feeding. In the further, combining with the directional antenna, it will generate the pattern diversity in the half-sphere space. The antenna of the coaxial wire with slot array can further transform into conical CP beam antenna if the coaxial wire becomes into a conical frustum. By introducing the PIN diode into the slot, the antenna of the coaxial wire with slot array can radiate the reconfigurable directional beam by switching the states of the PIN diodes. By introducing a novel switchable microwave circuit, the omnidirectional /directional pattern switchable antenna can be realized easily.This book proposes a continues method to develop the potentialities of the omnidirectional antenna. And the readers can study the method or ideas of the omnidirectional slots antenna, even graft the CP or diversity methods to other antennae.
Author : Aldo Petosa
Publisher : Artech House Publishers
ISBN 13 :
Total Pages : 332 pages
Book Rating : 4.3/5 (91 download)
Download or read book Dielectric Resonator Antenna Handbook written by Aldo Petosa and published by Artech House Publishers. This book was released on 2007 with total page 332 pages. Available in PDF, EPUB and Kindle. Book excerpt: Today, more and more antenna engineers are viewing the Dielectric Resonator Antenna (DRA) as a preferable alternative to conventional low-gain designs because of several attractive features, including high radiation, light weight, small size and low profile. This practical resource presents complete, up-to-date details on DRAs in a single volume. The book provides professionals with clear guidance on the mode of operation and radiation behavior of DRAs, the main methods of excitation, and the major advances in DRA technology. This hands-on reference equips engineers with simple equations and graphs that help them rapidly design DRAs, without the need for complex analytical or numerical calculations. Numerous design examples are included to give practitioners a sense of the versatility that DRAs afford.
Author : Kin-Lu Wong
Publisher : John Wiley & Sons
ISBN 13 : 0471465739
Total Pages : 343 pages
Book Rating : 4.4/5 (714 download)
Download or read book Compact and Broadband Microstrip Antennas written by Kin-Lu Wong and published by John Wiley & Sons. This book was released on 2004-04-07 with total page 343 pages. Available in PDF, EPUB and Kindle. Book excerpt: Compact microstrip antennas are of great importance in meeting the miniaturization requirements of modern portable communications equipment This book is a comprehensive treatment of design techniques and test data for current compact and broadband microstrip designs Summarizes the work of the author and his graduate students who have published over 80 refereed journal articles on the subject in the past few years Advanced designs reported by various other prestigious antenna designers are incorporated as well
