Download or read book Investigation of Active Array Geometries to Improve Performance for 30 GHz Portable Satellite Communications Terminals written by and published by . This book was released on 1999 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Investigation of Active Array Geometries to Improve Performance for 30 GHz Portable Satellite Communications Terminals written by Theresa Rae Mekelburg and published by . This book was released on 1999 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Investigation of Active Array Geometries to Iimprove Performance for 30 GHz Portable Satellite Communications Terminals written by Theresa R. Mekelburg and published by . This book was released on 1999 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1994 with total page 836 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Modular and Scalable Architecture for Millimeter Wave Beam forming Antenna Systems written by HUSSAM. AL-SAEDI and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: As the demand for higher data rates increases, wireless technologies (e.g., satellite communications, fifth Generation (5G) wireless communications, and automotive radars) are migrating toward millimeter-wave (mm-W) frequencies (30-300 GHz) to utilize the numerous unused spectra available over this frequency band. For truly ubiquitous coverage over the globe, high throughput Ka-band satellite communication (SATCOM) offers the most optimal and a unique solution for providing world-wide information and sensing. Of particular interest is the development of land, or close-to-land, mobile systems for high data rate communications with continuous coverage for on-the-move commercial platforms, including cars, airplanes, ships, and trains. A modular and scalable phased-array antenna (PAA) architecture wherein the entire phased-array system is made of identical sub-array modules (building blocks) is the most promising approach to develop cost effective and flexible systems for mass market applications. Obviously, such architecture depends on the availability of a high-performance antenna element, antenna subarray modules, and beam-forming circuits. These are the main topics investigated in this PhD thesis. Two approaches were extensively studied in this PhD research to develop intelligent steerable antenna array modules as building blocks for large-scale Ka-band SATCOM applications. The first approach targeted the development of a working prototype for a wide-angle beam-steering Ka-band active PAA (APAA). In this approach, two APAA architectures were proposed, designed, fabricated, and measured to validate the proposed concepts. Both approaches exhibit wide beam-steering angles and fast beam-forming capabilities with full control on amplitude and phase of each antenna element by utilizing an intelligent beam-forming circuit that was developed at CIARS (Centre for Intelligent Antenna and Radio Systems). The first architecture comprises a novel single-fed CP antenna element integrated with the intelligent beam-forming circuit, to construct a wide beam-steering and low-cost CP-APAA. A 4×16 CP-APAA was designed and fabricated using low-cost printed circuit board (PCB) technology and it was tested over the frequency range (29.5-30 GHz) over an angular range of 0o-±40o. The second architecture utilized a highly integrated and wide band dually-polarized antenna element as a core component for the realization of a high-performance, compact, and polarization-agile Ka-band APAA module. The proposed antenna module was used to construct a proof-of-concept 16×16 modular APAA to radiate a high polarization purity pattern over a wide beam-steering angles ≥70o. The second proposed approach investigated two novel wideband and passive steerable antenna concepts as attractive low-cost alternatives suitable for a wide range of emerging mm-W communication systems. Such antenna systems are made of passive components, antennas, phase shifters, and passive feeding networks to reduce the power consumption, cost, and complexity of conventional active electronically steered arrays. In order to build such systems, a high-performance antenna and passive phase shifter (invented at CIARS) were integrated to eliminate the necessity for costly variable gain amplifiers (VGAs). The first proposed concept is a novel CP passive PAA comprised of the proposed single-fed CP antenna integrated with the CIARS phase shifter. The novel high-performance passive phase shifter was controlled by a low-profile and low-power consumption novel magnetic actuator to overcome the limitation of state-of-the-art passive phased arrays. The proposed CP passive PAA was designed, fabricated and tested at Ka-band (29.5-30.5 GHz) over an angular range of 0o-±38o. The second concept proposed here is a novel reconfigurable reflectarray antenna (RAA) element with a true-time-delay functionality. Its reconfigurability is realized by utilizing the proposed phase shifter integrated with an aperture-coupled microstrip patch antenna (ACMPA) to receive and re-radiate the electromagnetic energy efficiently. The proposed RAA element was designed and tested at Ka-band (27.5-30 GHz).
Download or read book International Aerospace Abstracts written by and published by . This book was released on 1999 with total page 974 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Electrical Electronics Abstracts written by and published by . This book was released on 1997 with total page 1860 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Antenna Engineering Handbook written by John Volakis and published by McGraw Hill Professional. This book was released on 2018-11-05 with total page 1424 pages. Available in PDF, EPUB and Kindle. Book excerpt: The gold-standard reference on the design and application of classic and modern antennas—fully updated to reflect the latest advances and technologiesThis new edition of the “bible of antenna engineering” has been updated to provide start-to-finish coverage of the latest innovations in antenna design and application. You will find in-depth discussion of antennas used in modern communication systems, mobile and personal wireless technologies, satellites, radar deployments, flexible electronics, and other emerging technologies, including 5G, terahertz, and wearable electronics. Antenna Engineering Handbook, Fifth Edition, is bolstered by real-world examples, hundreds of illustrations, and an emphasis on the practical aspects of antennas.Featuring 60 chapters and contributions from more than 80 renowned experts, this acclaimed resource is edited by one of the world’s leading antenna authorities. This edition features all of the classic antenna types, plus new and emerging designs, with 13 all-new chapters and important updates to nearly all chapters from past editions.Antenna Engineering Handbook, Fifth Edition, clearly explains cutting-edge applications in WLANs, automotive systems, PDAs, and handheld devices, making it an indispensable companion for today’s antenna practitioners and developers.Coverage includes:•Antenna basics and classic antennas•Design approaches for antennas and arrays•Wideband and multiband antennas•Antennas for mobile devices and PDAs, automotive applications, and aircraft•Base station and smart antennas•Beamforming and 5G antennas•Millimeter-wave and terahertz antennas•Flexible, wearable, thin film, origami, dielectric, and on-chip antennas•MIMO antennas and phased arrays•Direction-finding and GPS antennas•Active antennas•Low-profile wideband antennas•Nanoantennas•Reflectors and other satellite and radio-telescope antennas•Low-frequency, HF, VHF, UHF, ECM, and ESM antennas•Impedance-matching techniques and material characteristics•Metastructured and frequency selective surfaces•Propagation and guided structures•Computational techniques and toolsets•Indoor and outdoor measurements
Download or read book Large Deployable Satellite Antennas written by Baoyan Duan and published by Springer Nature. This book was released on 2020-06-29 with total page 282 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book discusses the innovative design, cable-net design and analysis, control, deployment, development and applications of large space-deployable antennas. Drawing on the authors’ own work in this field, it describes and analyzes various typical deployable antennas, membrane antennas and super-large space-assembled antennas, while chiefly focusing on mesh antennas due to their wide range of applications. It also investigates forming–finding design and the analysis of cable-truss structures for high-precision reflector antennas, as well as deployment process control and deployment reliability based on flexible multibody dynamic analysis. The book covers not only mechanical structure performance, but also electromagnetic performance realization and stability. Lastly, it proposes an electrical equivalent method for mesh reflector antennas and a coupling model for the structural displacement field and electrostatic field. Given the nature of its content, the book is intended for researchers, graduate students and engineers in the field of space antennas.
Download or read book Science Abstracts written by and published by . This book was released on 1993 with total page 980 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Satellite Communications Systems Engineering written by Louis J. Ippolito, Jr. and published by John Wiley & Sons. This book was released on 2017-02-28 with total page 464 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first edition of Satellite Communications Systems Engineering (Wiley 2008) was written for those concerned with the design and performance of satellite communications systems employed in fixed point to point, broadcasting, mobile, radio navigation, data relay, computer communications, and related satellite based applications. This welcome Second Edition continues the basic premise and enhances the publication with the latest updated information and new technologies developed since the publication of the first edition. The book is based on graduate level satellite communications course material and has served as the primary text for electrical engineering Masters and Doctoral level courses in satellite communications and related areas. Introductory to advanced engineering level students in electrical, communications and wireless network courses, and electrical engineers, communications engineers, systems engineers, and wireless network engineers looking for a refresher will find this essential text invaluable.
Download or read book Massive MIMO Systems written by Kazuki Maruta and published by MDPI. This book was released on 2020-07-03 with total page 330 pages. Available in PDF, EPUB and Kindle. Book excerpt: Multiple-input, multiple-output (MIMO), which transmits multiple data streams via multiple antenna elements, is one of the most attractive technologies in the wireless communication field. Its extension, called ‘massive MIMO’ or ‘large-scale MIMO’, in which base station has over one hundred of the antenna elements, is now seen as a promising candidate to realize 5G and beyond, as well as 6G mobile communications. It has been the first decade since its fundamental concept emerged. This Special Issue consists of 19 papers and each of them focuses on a popular topic related to massive MIMO systems, e.g. analog/digital hybrid signal processing, antenna fabrication, and machine learning incorporation. These achievements could boost its realization and deepen the academic and industrial knowledge of this field.
Download or read book Conformal Array Antenna Theory and Design written by Lars Josefsson and published by John Wiley & Sons. This book was released on 2006-02-10 with total page 512 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is the first comprehensive treatment of conformal antenna arrays from an engineering perspective. While providing a thorough foundation in theory, the authors of this publication provide a wealth of hands-on instruction for practical analysis and design of conformal antenna arrays. Thus, you get the knowledge you need, alongside the practical know-how to design antennas that are integrated into such structures aircrafts or skyscrapers.
Download or read book Fading and Shadowing in Wireless Systems written by P. Mohana Shankar and published by Springer. This book was released on 2017-05-05 with total page 827 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book offers a comprehensive overview of fading and shadowing in wireless channels. A number of statistical models including simple, hybrid, compound and cascaded ones are presented along with a detailed discussion of diversity techniques employed to mitigate the effects of fading and shadowing. The effects of co-channel interference before and after the implementation of diversity are also analyzed. To facilitate easy understanding of the models and the analysis, the background on probability and random variables is presented with relevant derivations of densities of the sums, products, ratios as well as order statistics of random variables. The book also provides material on digital modems of interest in wireless systems. The updated edition expands the background materials on probability by offering sections on Laplace and Mellin transforms, parameter estimation, statistical testing and receiver operating characteristics. Newer models for fading, shadowing and shadowed fading are included along with the analysis of diversity combining algorithms. In addition, this edition contains a new chapter on Cognitive Radio. Based on the response from readers of the First Edition, detailed Matlab scripts used in the preparation of this edition are provided. Wherever necessary, Maple scripts used are also provided.
Download or read book Millimeter Wave Antennas for 5G Mobile Terminals and Base Stations written by Shiban Kishen Koul and published by CRC Press. This book was released on 2020-11-24 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book discusses antenna designs for handheld devices as well as base stations. The book serves as a reference and a handy guide for graduate students and PhD students involved in the field of millimeter wave antenna design. It also gives insights to designers and practicing engineers who are actively engaged in design of antennas for future 5G devices. It offers an in-depth study, performance analysis and extensive characterization of novel antennas for 5G applications. The reader will learn about basic design methodology and techniques to develop antennas for 5G applications including concepts of path loss compensation, co-design of commercial 4G antennas with millimeter wave 5G antennas and antennas used in phase array and pattern diversity modules. Practical examples included in the book will help readers to build high performance antennas for 5G subsystems/systems using low cost technology. Key Features Provides simple design methodology of different antennas for handheld devices as well as base stations for 5G applications. Concept of path loss compensation introduced. Co-design of commercial 4G antennas with millimetre wave 5G antennas presented. Comparison of phased array versus pattern diversity modules discussed in detail. Fabrication and Measurement challenges at mmWaves and Research Avenues in antenna designs for 5G and beyond presented. Shiban Kishen Koul is an emeritus professor at the Centre for Applied Research in Electronics at the Indian Institute of Technology Delhi. He served as the chairman of Astra Microwave Products Limited, Hyderabad from 2009-2018. He is a Life Fellow of the Institution of Electrical and Electronics Engineering (IEEE), USA, a Fellow of the Indian National Academy of Engineering (INAE), and a Fellow of the Institution of Electronics and Telecommunication Engineers (IETE). Karthikeya G S worked as an assistant professor in Visvesvaraya technological university from 2013 to 2016 and completed his PhD from the Centre for Applied Research in Electronics at the Indian Institute of Technology Delhi in Dec.2019. He is a member of IEEE-Antenna Propagation Society and Antenna Test and Measurement society.
Download or read book Radiowave Propagation in Satellite Communications written by Louis J. Ippolito and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 249 pages. Available in PDF, EPUB and Kindle. Book excerpt: Radiowave Propagation in Communications was written with two basic objec tives: (l) to present an up-to-date review of the major radiowave propagation phenomena which hinder reliable space communications, and (2) to describe how these propagation phenomena affect the design and performance of satellite communications systems. Earth-orbiting satellites are employed extensively for the relay of information in a vast array of telecommunications, meteorological, government, and sci entific applications. Satellite systems rely on the transmission of radiowaves to and from the satellite and are dependent on the propagation characteristics of the transmission path, primarily the earth's atmosphere. Radiowave propagation thus plays a very important part in the design and ultimate performance of space communications systems. This book presents, for the first time, the meshing in a single publication of the fundamentals of radiowave propagation factors with a discussion of the practical consequences of these factors on satellite communications systems. Two major subfie1ds are involved in this book. Radiowave propagation, which is basically applied electromagnetic theory, provides the theory and an alytical tools for the first several chapters. Later chapters then apply propagation effects to the field of electrical engineering involved with satellite communi cations. The material progresses from the essential aspects of radiowave prop agation to the application of practical methods and techniques in the design and performance of satellite communications systems.
Download or read book Government Reports Announcements Index written by and published by . This book was released on 1994 with total page 646 pages. Available in PDF, EPUB and Kindle. Book excerpt:
