Circularly Polarized Dielectric Resonator Antennas

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 ...

Author: Raghvendra Kumar Chaudhary

Publisher:

ISBN: 1630818186

Category: Antennas (Electronics)

Page:

View: 461

Download →

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.
Posted in:

Design and Analysis of a Compact Dielectric Resonator Circularly Polarized Antenna and Four Resonator Bandpass Filter at Ku band for Satellite Communications Applications

All communications systems require band-limiting filters and antennas for proper operation.

Author: Joshua Matthew Patin

Publisher:

ISBN: OCLC:727060530

Category:

Page: 97

View: 743

Download →

All communications systems require band-limiting filters and antennas for proper operation. In space communications, strict requirements on size, weight, and power necessitate the use of low power, low loss components which are physically small and lightweight. Often times, higher frequencies are also desired in order to sustain higher data transfer rates. Circular polarization is a common need for space communications, as the atmosphere can unpredictably re-orient the polarization of a linearly polarized system. A need therefore exists for low loss, miniaturized high frequency filters and antennas for these applications. Moreover, the antenna must satisfy the circular polarization need. This thesis presents a study of dielectric resonator use for the design of a dielectric resonator filter and dielectric resonator antenna, both at Ku-band frequencies for satellite communications applications. Dielectric resonator filters can obtain very high quality factor (Q) responses due to their inherent low loss material, which is lucrative for communications systems, while dielectric resonator antennas can exhibit low loss and high radiation efficiency, but present a challenge in excitation for circular polarization from single feed designs. The filter designed in this research is a four element dielectric resonator filter operating at a center frequency of 13.029 GHz with a bandwidth of 89.5 MHz, and achieving a loaded Q of 145.58. The filter utilizes microstrip excitation of four dielectric resonators in the TE01[subscript lower case delta] resonant mode in iris-coupled cavities mounted on a low loss substrate. An investigation of the substrate topology, parametric studies on the filter parameters, and filter tuning methodologies are presented. This thesis also presents a dielectric resonator antenna achieving right handed circular polarization centered at 12.935 GHz, with a 17.24% 3 dB axial ratio bandwidth. The antenna features a single feed design utilizing back-side microstrip excitation through novel bowtie cross slots, exciting the dielectric resonator in the HEM11[subscript lower case delta] resonant mode. Parametric studies on the antenna parameters are presented and used to tune the final design. A prototype dielectric resonator antenna was fabricated and experimentally verified for impedance matching and radiation patterns showing reasonable agreement with the simulated data.
Posted in:

Nano Dielectric Resonator Antennas for 5G Applications

M. B. Oliver, R. K. Mongia, and Y. M. M. Antar, “A New Broadband Circularly Polarized Dielectric Resonator Antenna,” IEEE Antennas Propag. Soc. Int. Symp. 1995 Dig., vol. 1, pp. 4–7, 1995. 5. C. Huang, J. Wu, and K. Wong, ...

Author: Rajveer S. Yaduvanshi

Publisher: CRC Press

ISBN: 9781000067279

Category: Technology & Engineering

Page: 350

View: 478

Download →

We are always surrounded by electromagnetic waves and fields of various spectra. This book explains basic electromagnetic theory with the help of design formulations i.e. mathematical background on antennas along with experimentations, which has made this book unique. The main purpose of this book is to embed mathematical EM theory of dielectric resonator antennas with experimental validation so that understanding of concepts takes place. Initially, basic understanding of philosophy of dielectric resonators has been discussed, then it is supported with mathematical modeling and later same is implemented with its prototype model along with experimentations. The modes theory gives important analysis on currents distribution, impedance analysis and radiation pattern in DRA. Circular polarization can built signal robustness, case studies on circular polarization has been included. Equivalent RLC circuit concept has been introduced. Challenges of switching from microwave to terahertz has been briefly discussed. Nano DRA will revolutionize the wireless technology. Nano DRA ,Terahertz DRA and Quantum DRA have analyzed and studied.
Posted in:

Circularly Polarized Antennas

Wideband omnidirectional circularly polarized dielectric resonator antenna with parasitic strips, IEEE Trans. Antennas Propagat., 60(6):2992–2997, 2012. [77] Khalily, M., M.K.A. Rahim and A.A.Kishk. Planar widebandcircularly polarized ...

Author: Steven Shichang Gao

Publisher: John Wiley & Sons

ISBN: 9781118790519

Category: Technology & Engineering

Page: 328

View: 426

Download →

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.
Posted in:

Design and Analysis of Singly fed Dielectric Resonator Antennas with a Wideband Circular Polarization

The studied geometries have been modeled using a comprehensive self developed MoM code that employs the volume surface integral equation (VSIE).

Author: Mohamad Ismail Sulaiman

Publisher:

ISBN: OCLC:862754228

Category:

Page:

View: 668

Download →

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.
Posted in:

Advances in Networks Security and Communications Reviews Vol 2

B. Li, C.-X. Hao, X.-Q. Sheng, A dual-mode quadrature-fed wideband circularly polarized dielectric resonator antenna, IEEE Antennas and Wireless Propagation Letters, Vol. 8, 2009, pp. 1036-1038. [47]. H. San Ngan, X. S. Fang, ...

Author: Sergey Yurish

Publisher: Lulu.com

ISBN: 9788409145102

Category:

Page:

View: 549

Download →

Posted in:

Trends in Wireless Communication and Information Security

Kumari R, Gangwar RK (2016) Circularly polarized dielectric resonator antennas: design and developments. Wireless Pers. Commun 86:851–886 2. Fakhte S, Oraizi H, Karimian R (2014) A novel low-cost circularly polarized rotated stacked ...

Author: Mithun Chakraborty

Publisher: Springer Nature

ISBN: 9789813363939

Category: Technology & Engineering

Page: 416

View: 388

Download →

This book presents best selected papers presented at the International Conference on Emerging Wireless Communication Technologies and Information Security (EWCIS 2020), held from 8th & 9th October 2020 at Amity University Jharkhand, Ranchi, India. The book includes papers in the research area of wireless communications and intelligent systems, signal and image processing in engineering applications, data communication and information security, IoT and cloud computing. The contribution ranges from scientists, engineers and technologists from academia as well as from industry.
Posted in: