Download or read book Lumped Element and Leaky wave Antennas for Millimeter Waves written by Arthur A. Oliner and published by . This book was released on 1984 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This abstract is concerned with certain types of antennas for millimeter waves that cannot be successfully scaled from their microwave frequency counterparts Among these antennas, we chose first to explore novel antennas of the leaky-wave type, largely because they form a natural class of antennas for millimeter waves. Leaky-wave antennas for the millimeter wave range face two main problems. The first relates to the small wavelengths involved, which require small waveguide dimensions and pose fabrication difficulties. The second problem is higher metal loss. We are overcoming the first of these problems by considering leaky-wave structures with longitudinally-continuous apertures, and the second by basing the antennas on low-loss waveguides. With these essential features in mind, our program involves two parallel approaches to the same basic problem: novel leaky-wave antennas suitable for millimeter wavelengths. The parallel approaches employ, first of all, two different basic low-loss waveguides, and second, two different mechanisms to produce leakage. As a result, two new antenna types have emerged.

Download or read book Lumped Element and Leaky Wave Antennas for Millimeter Waves written by A. A. Oliner and published by . This book was released on 1986 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt: Some millimeter wave antennas can be scaled from their microwave frequency counterparts, but others cannot because of two main problems; the small wavelengths, which require small waveguide dimensions and pose fabrication difficulties, and higher metal loss. This contract was concerned with those antennas that cannot be scaled successfully, and it concentrated on novel leaky wave antennas. Two such waveguides were selected: the groove guide, and nonradiative dielectric (NRD) guide. Six different leaky wave antennas were analyzed on this program, with two treated in special detail. Three different leaky wave antennas were analyzed on this program, with two treated in special detail. Three different mechanisms for producing leakage were employed: asymmetry, foreshortening the structure's cross section, and using leaky higher modes. The different mechanisms also lead to different polarizations of the radiated fields. Accurate theoretical analyses were conducted for each of the antenna structures. Transverse equivalent networks were established, the elements of which were derived in closed form, so that the dispersion relations were also. Numerical values for the propagation characteristics were obtained as a function of various geometric parameters, to aid in the design of antennas based on these leaky structures. Special design considerations, including optimization procedures, were also developed when possible. In the case of the foreshortened top antenna based on NRD guide, detailed measurements were also taken, which showed very good agreement with our theory.

Download or read book A New Leaky Wave Antenna for Millimeter Waves Based on the Groove Guide written by P. Lampariello and published by . This book was released on 1984 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Leaky wave antennas for millimeter waves face two main problems. The first relates to the small wavelengths involved, which require small waveguide dimensions and pose fabrication difficulties. The second problem is higher metal loss. In the new leaky wave antenna described and analyzed here, we overcome the first of these problems by choosing a structure with a longitudinally continuous aperture, and the second by basing the antenna on a low-loss waveguide, the groove guide. The groove guide is an open waveguide, but its dominant mode is purely bound by virtue of structural symmetry. By placing a longitudinal asymmetric metal strip along the guide, the symmetry is distributed and a new TEM-like mode is produced in the transverse direction that propagates to the open end and leaks power away. An accurate theoretical analysis is presented for the performance properties of this antenna structure. The cross section is represented by a transverse equivalent network that contains some subtle features. All of the elements of this transverse network are obtained in closed form, so that the dispersion relation for the propagation characteristics is likewise in closed form.

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1986 with total page 992 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Infrared and Millimeter Waves V4 written by Kenneth J. Button and published by Elsevier. This book was released on 2014-04-08 with total page 379 pages. Available in PDF, EPUB and Kindle. Book excerpt: Infrared and Millimeter Waves is a series of books that compiles the work of several authors, with each volume focusing on certain aspects of infrared and millimeter waves, such as sources of radiation, instrumentation, and millimeter systems. This book concerns itself with millimeter systems. Comprised of seven chapters, this book discusses several systems that involve the use of millimeter waves, such as radars and missile guidance systems. The first chapter provides a comprehensive overview of millimeter waves, while the succeeding chapter discusses several technologies that involve millimeter systems, such as radar, missile guidance, and imaging systems. This book will be of great use to researchers and professionals whose work involves infrared and millimeter waves.

Download or read book Millimeter Wave Antennas Configurations and Applications written by Jaco du Preez and published by Springer. This book was released on 2016-06-20 with total page 165 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book comprehensively reviews the state of the art in millimeter-wave antennas, traces important recent developments and provides information on a wide range of antenna configurations and applications. While fundamental theoretical aspects are discussed whenever necessary, the book primarily focuses on design principles and concepts, manufacture, measurement techniques, and practical results. Each of the various antenna types scalable to millimeter-wave dimensions is considered individually, with coverage of leaky-wave and surface-wave antennas, printed antennas, integrated antennas, and reflector and lens systems. The final two chapters address the subject from a systems perspective, providing an overview of supporting circuitry and examining in detail diverse millimeter-wave applications, including high-speed wireless communications, radio astronomy, and radar. The vast amount of information now available on millimeter-wave systems can be daunting for researchers and designers entering the field. This book offers readers essential guidance, helping them to gain a thorough understanding based on the most recent research findings and serving as a sound basis for informed decision-making.

Download or read book A Dielectric loaded Leaky Wave Antenna written by Jorgen Aasted and published by . This book was released on 1961 with total page 114 pages. Available in PDF, EPUB and Kindle. Book excerpt: The design and the measured performance are described of a flat, leaky-wave antenna in which the inductive, leaky surface is backed with a slab of dielectric. The analysis is based on a transverse resonance analysis which determines the physical dimensions of the antenna for a certain specified aperture distribution. An antenna was built to compare the theoretical behavior with the measured performance. Two ways of forming the dielectric to the antenna were tested. When the dielectric was molded in place the radiation pattern agreed very well with the theoretically predicted pattern, but high losses in the casting resin gave a lower gain for the antenna than anticipated. For a machined piece of dielectric, the radiation pattern was not as close to the predicted pattern as for the molded sample, but the gain was close to the predicted value. The antenna consists of a 28-by-18-inch through filled with a dielectric material over which a sheet of parallel wires is strung. At the design frequency, 4.75 gc, the antenna radiates a pencil beam 9.4 by 8.3 degrees wide at an angle of 54 degrees measured from the normal to the inductive surface. The beam can be scanned from approximately 75 degrees down to 12 degrees from the normal to the aperture by changing the frequency from 5.25 gc to 4.20 gc. (Author).

Download or read book Dielectric Leaky wave Antennas for Millimeter wave Applications written by Scott Lee Ray and published by . This book was released on 1981 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Infrared and Millimeter Waves Millimeter systems written by Kenneth J. Button and published by . This book was released on 1979 with total page 390 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Trapped Image Guide Leaky Wave Antennas for Millimeter Wave Applications written by Tatsuo Itoh and published by . This book was released on 1980 with total page 6 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 Millimeter wave Frequency Scannable Dielectric Leaky wave Antenna written by John Yao-An Liao and published by . This book was released on 1995 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Concepts and Applications of MICROWAVE ENGINEERING written by SANJAY KUMAR and published by PHI Learning Pvt. Ltd.. This book was released on 2014-04-02 with total page 358 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book is primarily designed to cater to the needs of undergraduate and postgraduate students of Electronics and Communication Engineering and allied branches. The book has been written keeping average students in mind. This well-organised and lucidly written text gives a comprehensive view of microwave concepts covering its vast spectrum, transmission line, network analysis, microwave tubes, microwave solid-state devices, microwave measurement techniques, microwave antenna theories, radars and satellite communication. KEY FEATURES • A fairly large number of well-labelled diagrams provides practical understanding of the concepts. • Solved numerical problems aptly crafted and placed right after conceptual discussion provide better comprehension of the subject matter. • Chapter summary highlights important points for quick recap and revision before examination. • About 200 MCQs with answers help students to prepare for competitive examinations. • Appropriate number of unsolved numerical problems with answers improves problem solving skill of students. • Simplified complex mathematical derivations by synthesising them in smaller parts for easy grasping. Audience Undergraduate and Postgraduate students of Electronics and Communication Engineering and allied branches

Download or read book Microwave and RF Product Applications written by Mike Golio and published by CRC Press. This book was released on 2003-06-27 with total page 442 pages. Available in PDF, EPUB and Kindle. Book excerpt: The field of microwave engineering has undergone a radical transformation in recent years, as commercial wireless endeavors overtook defense and government work. The modern microwave and RF engineer must be knowledgeable about customer expectations, market trends, manufacturing technologies, and factory models to a degree that is unprecedented. Unfortunately, most of the available literature does not reflect this fact, but remains focused on high-performance, low-volume applications. Microwave and RF Product Applications helps resolve that deficiency. Editor Mike Golio culled its chapters from his bestselling RF and Microwave Handbook, incorporated critical updates contributed by the original authors, and organized the chapters into a practical, tightly focused reference. A complete table of contents at the front of the text makes finding specific answers quick and easy, and detailed lists of references in each chapter provide convenient access to the relevant expert literature. For engineers in industry, government, or academia, Microwave and RF Product Applications provides insight and information that may be outside their area of expertise. For managers, marketers, and technical support personnel, it builds a better understanding of the fields that drive and are affected by their decisions.

Download or read book Government Reports Annual Index written by and published by . This book was released on 1986 with total page 1336 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Research in Progress written by and published by . This book was released on with total page 424 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Metamaterials written by Nader Engheta and published by John Wiley & Sons. This book was released on 2006-06-23 with total page 438 pages. Available in PDF, EPUB and Kindle. Book excerpt: Leading experts explore the exotic properties and exciting applications of electromagnetic metamaterials Metamaterials: Physics and Engineering Explorations gives readers a clearly written, richly illustrated introduction to the most recent research developments in the area of electromagnetic metamaterials. It explores the fundamental physics, the designs, and the engineering aspects, and points to a myriad of exciting potential applications. The editors, acknowledged leaders in the field of metamaterials, have invited a group of leading researchers to present both their own findings and the full array of state-of-the-art applications for antennas, waveguides, devices, and components. Following a brief overview of the history of artificial materials, the publication divides its coverage into two major classes of metamaterials. The first half of the publication examines effective media with single (SNG) and double negative (DNG) properties; the second half examines electromagnetic band gap (EBG) structures. The book further divides each of these classes into their three-dimensional (3D volumetric) and two-dimensional (2D planar or surface) realizations. Examples of each type of metamaterial are presented, and their known and anticipated properties are reviewed. Collectively, Metamaterials: Physics and Engineering Explorations presents a review of recent research advances associated with a highly diverse set of electromagnetic metamaterials. Its multifaceted approach offers readers a combination of theoretical, numerical, and experimental perspectives for a better understanding of their behaviors and their potentialapplications in components, devices, and systems. Extensive reference lists provide opportunities to explore individual topics and classes of metamaterials in greater depth. With full-color illustrations throughout to clarify concepts and help visualize actual results, this book provides a dynamic, user-friendly resource for students, engineers, physicists, and other researchers in the areas of electromagnetic materials, microwaves, millimeter waves, and optics. It equips newcomers with a basic understanding of metamaterials and their potential applications. Advanced researchers will benefit from thought-provoking perspectives that will deepen their knowledge and lead them to new areas of investigation.