Download or read book Hemispherically Scanned Arrays written by Alfred T. Villeneuve and published by . This book was released on 1975 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt: The report contains analyses of the radiation characteristics of grounded dielectric slabs fed by slots in a groundplane. It also contains experimental patterns of such configurations. In Addition, measured patterns of slots with parasitic radiating elements, and of combinations of slots, surface wave structures and parasitic elements, are included. It is shown that significant improvement of radiation at the horizon can be obtained in the E-plane and that significant broadening of the pattern can be obtained in the H-plane. Patterns of a linear array of slots in a groundplane with curved extensions, electronically scanned in the E-plane show that significant improvement in radiation at endfire can be obtained using a surface wave structure. Recommendations for further study are included. (Author).
Download or read book Hemispherically Scanned Arrays written by Alfred T. Villeneuve and published by . This book was released on 1973 with total page 37 pages. Available in PDF, EPUB and Kindle. Book excerpt: The report contains analyses of the radiation characteristics of grounded dielectric slabs fed by slots in a groundplane. It also contains experimental patterns of such configurations. In Addition, measured patterns of slots with parasitic radiating elements, and of combinations of slots, surface wave structures and parasitic elements, are included. It is shown that significant improvement of radiation at the horizon can be obtained in the E-plane and that significant broadening of the pattern can be obtained in the H-plane. Patterns of a linear array of slots in a groundplane with curved extensions, electronically scanned in the E-plane show that significant improvement in radiation at endfire can be obtained using a surface wave structure. Recommendations for further study are included. (Author).
Download or read book Electronically Scanned Arrays written by Robert J. Mailloux and published by Morgan & Claypool Publishers. This book was released on 2007 with total page 93 pages. Available in PDF, EPUB and Kindle. Book excerpt: Provides a compact but comprehensive treatment of the scanned array, from the underlying basis for array pattern behaviour to the engineering choices leading to successful design. The book describes the scanned array in terms of radiation from apertures and wire antennas and introduces the effects resulting directly from scanning.
Download or read book Active Electronically Scanned Arrays written by Arik D. Brown and published by John Wiley & Sons. This book was released on 2021-12-14 with total page 276 pages. Available in PDF, EPUB and Kindle. Book excerpt: In Active Electronically Scanned Arrays: Fundamentals and Applications, electromagnetics expert Dr. Arik D. Brown delivers a foundational treatment of active electronically scanned arrays (AESAs) ideal for engineering students and professionals. The distinguished author provides an overview of the primary subsystems of an AESA and detailed explanations of key design concepts and fundamentals for subsystems, including antenna array elements, transmit/receive modules, and beamformers. Performance results for various AESA architectures often found in industry, including analog, subarrayed, and digital beamforming AESAs, are discussed. With a focus on practical knowledge and applications, Active Electronically Scanned Arrays: Fundamentals and Applications offers an accessible overview of a technology critical to the implementation of collision avoidance in cars, air surveillance radar, communication antennas, and defense technologies. The book also includes: A thorough introduction to AESAs, including a top-level block diagram view and explanations of key components and subsystems Detailed explanations of the impact of AESAs on mission applications including Radar, Electronic Attack (EA), Electronic Support Measures (ESM), SIGINT and Communications Comprehensive explorations of antenna array elements, transmit/receive modules, and beamformers including their purpose, functions, and practical design considerations In-depth examinations of AESA architecture performance for current and future systems Utility of AESAs for implementing adaptive beamforming for Electronic Counter-Countermeasures (ECCM) Perfect for electrical engineers working with active electronically scanned arrays, electronic warfare technologies, radar, or communications, Active Electronically Scanned Arrays: Fundamentals and Applications will also prove to be an invaluable resource for defense students undertaking military education and training.
Download or read book Antenna Elements that Enable a Phased Array to be Scanned Over a Hemispherical Sector written by Pierce Johnson and published by . This book was released on 1969 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Microstrip Antenna Elements for Use in Hemispherically Scanned Arrays written by Nicholas P. Kernweis and published by . This book was released on 1979 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report is an experimental study of various modifications that affect the radiation pattern of a circular disc microstrip element. The objective is to produce an element pattern with enhanced performance in the angular regions well away from broadside. The study includes the effect of higher order modes, an investigation of circumferential loading, the use of shorting pins at the element edge, and the pattern changes produced by mutual coupling in a closely spaced array. (Author).
Download or read book Modelling and Design Theory of Multi faceted Antenna Arrays for Hemispherical Scan Coverage written by Inas Taymour Khalifa and published by . This book was released on 2007 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Hemispherical scan coverage, where the antenna beam may be positioned anywhere above horizon, is required in many applications such as satellite communications, and surveillance and tracking radar systems. This work involves the modelling and design of multi-faceted antenna arrays for providing general hemispherical coverage. Two classes of multi-faceted antenna arrays are used, namely, pyramids and pyramidal frusta, and four stages of their design process are considered. The first stage concerns the geometric design of the antenna and presents simple and novel methods to determine the optimal antenna geometry. Investigations of how the maximum scan angle is affected by far-field approximation and by the number of faces are also presented. The second stage focuses on the design of the circularly polarized circular patch antenna element. Its polarization purity is investigated over angular sectors about broadside. The results show that there is a well-defined optimal patch size which produces extremely pure polarization. This size corresponds to specific low values of the relative substrate permittivity. The third stage deals with the design of the planar array supported by each of the antenna faces. It presents a comparison between the two methods typically used to compute the element spacing over all coverage ranges and using different antenna configurations. The final stage presents a performance evaluation framework which compares planar, pyramidal, and pyramidal frustum arrays. Four increasingly detailed levels of evaluation are performed: using the geometric structure only; then incorporating the array factor; and finally including both the modelled; and the simulated element patterns. The results demonstrate that the performance advantages of multi-faceted arrays over planar arrays increase as the coverage range becomes wider and/or closer to horizon, and when the directional radiation characteristics of the antenna element are considered. They also show that no clear improvement is gained by using more than about 10 faces, given the added area, cost, and complexity involved. Moreover, under most circumstances, there is no significant difference in performance among pyramids with 4 to 7 faces or among pyramidal frusta with 5 to 9 faces.
Download or read book Active Electronically Scanned Arrays written by Arik D. Brown and published by John Wiley & Sons. This book was released on 2021-11-23 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt: In Active Electronically Scanned Arrays: Fundamentals and Applications, electromagnetics expert Dr. Arik D. Brown delivers a foundational treatment of active electronically scanned arrays (AESAs) ideal for engineering students and professionals. The distinguished author provides an overview of the primary subsystems of an AESA and detailed explanations of key design concepts and fundamentals for subsystems, including antenna array elements, transmit/receive modules, and beamformers. Performance results for various AESA architectures often found in industry, including analog, subarrayed, and digital beamforming AESAs, are discussed. With a focus on practical knowledge and applications, Active Electronically Scanned Arrays: Fundamentals and Applications offers an accessible overview of a technology critical to the implementation of collision avoidance in cars, air surveillance radar, communication antennas, and defense technologies. The book also includes: A thorough introduction to AESAs, including a top-level block diagram view and explanations of key components and subsystems Detailed explanations of the impact of AESAs on mission applications including Radar, Electronic Attack (EA), Electronic Support Measures (ESM), SIGINT and Communications Comprehensive explorations of antenna array elements, transmit/receive modules, and beamformers including their purpose, functions, and practical design considerations In-depth examinations of AESA architecture performance for current and future systems Utility of AESAs for implementing adaptive beamforming for Electronic Counter-Countermeasures (ECCM) Perfect for electrical engineers working with active electronically scanned arrays, electronic warfare technologies, radar, or communications, Active Electronically Scanned Arrays: Fundamentals and Applications will also prove to be an invaluable resource for defense students undertaking military education and training.
Download or read book Phased Array Antennas written by Robert C. Hansen and published by John Wiley & Sons. This book was released on 2009-11-19 with total page 571 pages. Available in PDF, EPUB and Kindle. Book excerpt: An in-depth treatment of array phenomena and all aspects of phased array analysis and design Phased Array Antennas, Second Edition is a comprehensive reference on the vastly evolving field of array antennas. The Second Edition continues to provide an in-depth evaluation of array phenomena with a new emphasis on developments that have occurred in the field over the past decade. The book offers the same detailed coverage of all practical and theoretical aspects of phased arrays as the first edition, but it now includes: New chapters on array-fed reflector antennas; connected arrays; and reflect arrays and retrodirective arrays Brand-new coverage of artificial magnetic conductors, and Bode matching limitations A clear explanation of the common misunderstanding of scan element pattern measurement, along with appropriate equations In-depth coverage of finite array Gibbsian models, photonic feeding and time delay, waveguide simulators, and beam orthogonality The book is complemented with a multitude of original curves and tables that illustrate how particular behaviors were derived from the author's hundreds of programs developed over the past forty years. Additionally, numerous computer design algorithms and numerical tips are included throughout the book to help aid in readers' comprehension. Phased Array Antennas, Second Edition is an ideal resource for antenna design engineers, radar engineers, PCS engineers, and communications engineers, or any professional who works to develop radar and telecommunications systems. It also serves as a valuable textbook for courses in phased array design and theory at the upper-undergraduate and graduate levels.
Download or read book A Phased Array Antenna with Hemispheric Scan for Satellite Tracking written by Thomas B. Markham (CAPT, USAF.) and published by . This book was released on 1972 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Hemispherically Scanned Antennas written by Alfred T. Villeneuve and published by . This book was released on 1975 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: The report contains the results of a study of techniques for obtaining extended coverage element patterns for use on hemispherically scanned phased arrays on cylinders of large radius of curvature. It contains experimental patterns of slot radiators on such a cylinder covered with surface wave structures. Experimental patterns of slots coupled to parasitic dipoles extended around the cylinder are also included. An analysis that treats sources on reactive cylinders is performed to determine what type of surfaces will give extended coverage when the polarization is parallel to the cylinder axis. The results of the study indicate that improved coverage can be obtained using reactive surfaces that are selected to affect TE waves and TM waves in different manners. Such surfaces can be constructed by combining corrugated conductors and dielectric slabs. The combination can be selected to provide effectively the proper surface reactance to allow radiation near the horizon for both polarizations.
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 Scientific and Technical Aerospace Reports written by and published by . This book was released on 1987 with total page 964 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Phased Array Antenna Handbook Third Edition written by Robert J. Mailloux and published by Artech House. This book was released on 2017-11-30 with total page 549 pages. Available in PDF, EPUB and Kindle. Book excerpt: This completely revised third edition of an Artech House classic, Phased Array Antenna Handbook, Second Edition, offers an up-to-date and comprehensive treatment of array antennas and systems. This edition provides a wealth of new material, including expanded coverage of phased array and multiple beam antennas. New modern machine learning techniques used for analysis are included. Additional material on wideband antennas and wideband coverage in array antennas are incorporated in this book, including new methods, devices, and technologies that have developed since the second edition. A detailed treatment of antenna system noise, sections on antenna pattern synthesis, developments in subarray technology, and in-depth coverage of array architecture and components are additional new features of this book. The book explores design elements that demonstrate how to size an array system with speed and confidence. Moreover, this resource provides expanded coverage of systems aspects of arrays for radar and communications. Supported with numerous equations and illustrations, this practical book helps evaluate basic antenna parameters such as gain, sidelobe levels, and noise. Readers learn how to compute antenna system noise, design subarray geometries for given bandwidth, scan and sidelobe constraints, and choose array illumination tapers for given sidelobe levels.
Download or read book Report on Research at AFCRL written by Air Force Cambridge Research Laboratories (U.S.) and published by . This book was released on 1972 with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Antenna and Array Technologies for Future Wireless Ecosystems written by Yingjie Jay Guo and published by John Wiley & Sons. This book was released on 2022-07-20 with total page 795 pages. Available in PDF, EPUB and Kindle. Book excerpt: ANTENNA AND ARRAY TECHNOLOGIES FOR FUTURE WIRELESS ECOSYSTEMS Discover a timely and accessible resource on the latest antenna research driving new developments in the field In Antenna and Array Technologies for Future Wireless Ecosystems, distinguished academics and authors Drs. Y. Jay Guo and Richard W. Ziolkowski deliver a cutting-edge resource for researchers, academics, students, and engineers who need the latest research findings on the newest challenges facing antenna designers who will be creating the technology that drives future 6G and beyond wireless systems and networks. This timely and impactful book offers the fundamental knowledge that will facilitate new research activities in the antennas and applied electromagnetics communities, and conveys innovative and practical solutions to many wireless industry problems. Its international cohort of leading authors delivers their findings on a variety of advanced topics in antenna and array research, including metasurface antennas; electrically small directive antennas; RF, millimeter-wave and THz antennas and arrays; atom-based sensors, and arrays of quantum emitters. The book also includes resources that cover the important topics: A thorough introduction to various intelligent and low-cost beam scanning, beamforming and beam-reconfigurable array technologies to support dynamic networking of future systems An exploration of advanced techniques for analyzing large arrays, as well as an examination of advanced antenna-in-package technologies for future mm-wave systems Discussions of the latest research on electrically small and extremely large hybrid antenna arrays, and photonic beamforming networks to address spectrum scarcity in future systems Low form-factor, low energy-consumption, and wireless power transfer antennas for the Internet of Things (IoT) This book is the companion of the Wiley book by the same authors, Advanced Antenna Array Engineering for 6G and Beyond Wireless Communications. Perfect for antenna engineers in academia and industry, Antenna and Array Technologies for Future Wireless Ecosystems will also be an essential resource in the libraries of senior undergraduate and graduate students studying antenna engineering applied electromagnetics and seeking a one-stop reference for state-of-the-art global antenna and antenna array research activities.
Download or read book International Symposium Digest Antennas and Propagation written by and published by . This book was released on 1982 with total page 404 pages. Available in PDF, EPUB and Kindle. Book excerpt:
