Download or read book Development of an Ultra wideband Low profile Wide Scan Angle Phased Array Anatenna written by Henry Hoang Vo and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Coupling in phased arrays is a major issue. Mutual coupling causes both gain and bandwidth reduction. Such coupling arises from the presence of adjacent elements that produce scattering and losses during low-angle beam steering. The scattering effect is comprised of (1) structural scattering and (2) antenna-mode coupling and associated losses. Losses occur when the coupled energy received by adjacent elements is dissipated at the back-end loads, resulting in lower gain at wide scan angles. In addition, the interference from periodic nature of large arrays or feed networks may produce undesired scattering modes and traveling waves that limit the upper bound of the operational frequency and maximum scan angle in ultra-wideband (UWB) arrays. As a result, current ultra wideband (UWB) array designs typically have limited scanning to no more than 45° from normal. In this dissertation, we examine the low angle scanning issues. These issues are verified via full-wave simulation. Our studies show that mutual coupling in the H-plane is stronger than in the E-plane, likely due to the dipole element pattern shape.

Download or read book Ultra wideband RF Photonic Phased Array Antenna written by Dylan D. Ross and published by . This book was released on 2016 with total page 85 pages. Available in PDF, EPUB and Kindle. Book excerpt: Modern RF antenna systems are being asked to address many simultaneous and pressing challenges, e.g., wide operational bandwidth, dynamic gain profiles, and conformal profiles. One way to address these is to develop a flexible and ultra-wideband (UWB) phased array antenna. However, the design, fabrication, and integration of such an array using an all-RF feed is exceedingly difficult. Thus, presented is an optical feeding technique to achieve efficient excitation of an UWB connected-array (CA) antenna. By feeding the array optically, preservation of the theoretical bandwidth and low-profile of elementary connected dipole elements is enabled. Coupling of light to a photodiode merely requires enough space to firmly secure a fiber ferrule, allowing population of more densely packed arrays, namely the CA, which offers potentially wide operational bandwidth. Additionally, optical feeding of the array can provide low noise excitation of the radiating elements, which supports high fidelity beam steering of independent signals over the array's ultra-wide bandwidth along with variable gain with suitable apodization. Currently all of these abilities are unattainable by conventional electronic feeding networks. Previously the main limiting factor for the realization of such an optical system was the low power handling capability of the photodiode at the antenna feed point. Recently, however, modified uni-travelling carrier (MUTC) photodiodes, flip-chip bonded to high-thermal conductivity aluminum nitride (AlN), have achieved output powers of over 1 W at 10 GHz under CW operation [37], and over 10 W using pulsed power modulation [38]. A robust prototype MUTC photodiode-integrated antenna array on AlN with direct fiber feed to each antenna element is discussed and demonstrated that provides 5-20 GHz bandwidth and size, weight, and power (SWaP) superior to conventional electronic phased array systems [44].

Download or read book Ultrawideband Phased Array Antenna Technology for Sensing and Communications Systems written by Alan J. Fenn and published by MIT Press. This book was released on 2015-04-10 with total page 297 pages. Available in PDF, EPUB and Kindle. Book excerpt: Practical ultrawideband phased array technology used in airborne and ground-based systems applications.

Download or read book Low profile Modular Ultra wideband Phased Arrays written by Steven S. Holland and published by . This book was released on 2011 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ultrawideband (UWB) phased antenna arrays are critical to the success of future multi-functional communication, sensing, and countermeasure systems, which will utilize a few UWB phased arrays in place of multiple antennas on a platform. The success of this new systems approach relies in part on the ability to manufacture and assemble low-cost UWB phased arrays with excellent radiation characteristics. This dissertation presents the theory and design of a new class of UWB arrays that is based on unbalanced fed tightly-coupled horizontal dipoles over a ground plane. Practical implementation of this concept leads to two inexpensive wideband array topologies, the Banyan Tree Antenna (BTA) Array, and the Planar Ultrawideband Modular Antenna (PUMA) Array. The key challenge in designing unbalanced-fed tightly-coupled dipole arrays lies in the control of a common mode resonance that destroys UWB performance. This work introduces a novel feeding strategy that eliminates this resonance and results in wideband, wide-angle radiation. More importantly, the new feeding scheme is simple and intuitive, and can be implemented at low-cost in both vertically and planarly-integrated phased array architectures. Another desirable byproduct of this topology is the electrical and mechanical modularity of the aperture, which enables easy manufacturability and assembly. A theoretical framework is presented for the new phased array topologies, which is then applied to the design of innite BTA and PUMA arrays that achieve 4:1 and 5:1 bandwidths, respectively. A practical application of this technology is demonstrated through the full design, fabrication, and measurement of a 7.25-21GHz 16x16 dual-pol PUMA array prototype for SATCOM applications.

Download or read book Ultra Wideband Antennas written by Giselle M. Galvan-Tejada and published by CRC Press. This book was released on 2017-12-19 with total page 295 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ultra Wideband Antennas: Design, Methodologies, and Performance presents the current state of the art of ultra wideband (UWB) antennas, from theory specific for these radiators to guidelines for the design of omnidirectional and directional UWB antennas. Offering a comprehensive overview of the latest UWB antenna research and development, this book: Discusses the developed theory for UWB antennas in frequency and time domains Delivers a brief exposition of numerical methods for electromagnetics oriented to antennas Describes solid-planar equivalence, which allows flat structures to be implemented instead of volumetric antennas Examines the impedance matching, phase linearity, and radiation patterns as design objectives for omnidirectional and directional antennas Addresses the time domain signal analysis for UWB antennas, from which the distortion phenomenon can be modeled Includes illustrative examples, design equations, CST MICROWAVE STUDIO® simulations, and MATLAB® plot generations Compares the performance of different UWB antennas, supplying useful insight into particular tendencies and unresolved problems Ultra Wideband Antennas: Design, Methodologies, and Performance provides a valuable reference for the scientific community, as UWB antennas have a variety of applications in body area networks, radar, imaging, spectrum monitoring, electronic warfare, wireless sensor networks, and more.

Download or read book Practical Aspects of Active Phased Array Antenna Development written by Ashok K. Agrawal and published by Artech House. This book was released on 2023-05-31 with total page 281 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a practical and comprehensive guide to the design, analysis, and development of an active phased array antenna system. Reflecting the author’s decades of experience with these systems, the book is unique in that it pulls together in one volume key information from several disciplines and covers all the components of an active phased array antenna system, giving you the full scope of knowledge necessary to confidently design systems with high reliability and maintainability. It walks you through the multiple aspects of the active phased array antenna system design, with inputs from diverse specialties such as aperture design, T/R module design, hybrid lab, beam steering control, mechanical engineering, and manufacturing – helping you avoid problems that often require the redesign of some of the components of the antenna system. You will find step-by-step guidance on the design and analysis of an active phased array antenna system, including T/R modules, DC/DC converters, beamformers, beam steering controller, antenna packaging, thermal management, and antenna calibration in the field. You will also find details on antenna design for high reliability and clutter improvement factor, digital beamforming arrays, and strategies for cost reduction. With its unique coverage and practical approach, this is an important book for engineers new to the field as well as experienced antenna and radar engineers working on active phased array antenna systems.

Download or read book Ultrawideband Antennas written by Daniel Valderas and published by World Scientific. This book was released on 2011 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ultrawideband (UWB) technology, positioned as the cutting edge of research and development, paves the way to meet the emerging demands set by broadband wireless applications, such as high-speed data transmission, medical imaging, short-range radars, electromagnetic testing, etc. This breathtaking resource builds upon the basics of UWB technology to provide a complete compilation of figures of merit along with a vital state-of-the-art of the different antenna alternatives that are to be employed according to the specific application. Without excessive recourse to mathematics, this volume emphasizes on the UWB antenna design and equips readers with practical prediction techniques based on simple formulas and models. The big picture of UWB antenna technology would not be complete without addressing its applications, and this will serve to provide consultants with key clues for slot market searching. Containing over 150 supporting illustrations and figures, this comprehensive overview of UWB technology, antenna design and applications is a vital source of information and reference for R&D organizations, researchers, practitioners, consultants, RF professionals and communication engineers.

Download or read book Realization of a Planar Low profile Broadband Phased Array Antenna written by Justin Allen Kasemodel and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: With space at a premium, there is strong interest to develop a single ultra wideband (UWB) conformal phased array aperture capable of supporting communications, electronic warfare and radar functions. However, typical wideband designs transform into narrowband or multiband apertures when placed over a ground plane. Therefore, it is not surprising that considerable attention has been devoted to electromagnetic bandgap (EBG) surfaces to mitigate the ground plane's destructive interference. However, EBGs and other periodic ground planes are narrowband and not suited for wideband applications. As a result, developing low-cost planar phased array apertures, which are concurrently broadband and low-profile over a ground plane, remains a challenge.

Download or read book Finite Antenna Arrays and FSS written by Ben A. Munk and published by John Wiley & Sons. This book was released on 2003-07-22 with total page 394 pages. Available in PDF, EPUB and Kindle. Book excerpt: A periodic surface is an assembly of identical elements arranged in a one or two-dimensional array. Such surfaces have various effects on incident electromagnetic waves. Their applications range from antennas to stealth aircraft.This book discusses finite antenna arrays and how to minimize the radar cross section of these arrays. "Ben has been the world-wide guru of this technology...Ben Munk has written a book that represents the epitomy of practical understanding." W. Bahret, United States Air Force Frequency selective surfaces (FSSs) have important military and civilian applications including antenna theory, satellite communications and stealth technology Author is an authory on the subject, having been instrumental in the development of stealth technology for the US Air Force Much of the material in this book was deemed classified due to its importance to defence

Download or read book Array and Phased Array Antenna Basics written by Hubregt J. Visser and published by John Wiley & Sons. This book was released on 2006-02-03 with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reflecting a growing interest in phased array antenna systems, stemming from radar, radio astronomy, mobile communications and satellite broadcasting, Array and Phased Array Antenna Basics introduces the principles of array and phased array antennas. Packed with first-hand practical experience and worked-out examples, this is a valuable learning tool and reference source for those wishing to improve their understanding of basic array antenna systems without relying heavily on a thorough knowledge of electromagnetics or antenna theory. Features a general introduction to antennas and explains the array antenna principle through discussion of the physical characteristics rather than the theory Explores topics often not covered in antenna textbooks, such as active element pattern, array feeding, means of phase changing, array antenna characterisation, sequential rotation techniques and reactively loaded arrays Guides the reader through the necessary mathematics, allowing them to move onto specialist books on array and phased array antennas with a greater understanding of the topic Supported by a companion website on which instructors and lecturers can find electronic versions of the figures An ideal introduction for those without a background in antennas, this clear, concise volume will appeal to technicians, researchers and managers working in academia, government, telecommunications and radio astronomy. It will also be a valuable resource for professionals and postgraduates with some antenna knowledge.

Download or read book Sparse Phased Array Antennas Theory and Applications written by Ashutosh Kedar and published by Artech House. This book was released on 2022-03-31 with total page 315 pages. Available in PDF, EPUB and Kindle. Book excerpt: This ground-breaking resource gives you the background theories and know-how you need to effectively design active phased array antennas with wider bandwidth and scan volume utilizing sparse array technology. The book shows you how to incorporate aperiodic arrays and sparse arrays as a solution for overcoming the restrictions faced in conventional phased antenna designs – such as blind spots, limited scan volume, large power and cooling requirements, RF path losses, and increased complexity – while adhering to the maintenance of SWAP-C resources widely used in aerospace and defence. Packed with step-by-step information and research results unavailable in any other single source to date, the book presents new concepts and techniques that potentially can be applied to many critical defense and commercial requirements such as: radars, satcom on move, sonars, weather monitoring, 5G and 6G for mobile communication, fault and crack detection in buildings and underground pipelines, automotive anti-collisions mechanism in automobiles, mine detection, through wall imaging, and more. The book helps you to understand the fundamental antenna technology being deployed in modern systems and equips you to design problem-solving sparse array models proven by electromagnetic simulations that can reduce the cost and overall complexity of the existing systems. Numerous design studies are documented to validate the theories presented. The book takes into account the functional constraints in designing commercial and military systems while demonstrating provable techniques that are practical and achievable. This is an important resource for phased array antenna designers interested in utilizing sparse array technology with wider bandwidth and scan volume. The book’s straightforward approach and easy-to-follow language also make it accessible to students and those new to the field.

Download or read book High power Photonic Antenna Arrays written by Matthew R. Konkol and published by . This book was released on 2018 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt: As RF phased array antennas continue to evolve to meet the demands of modern wireless applications, several pressing challenges are making it difficult for electronic-based systems to adapt. New systems are desired that exhibit ultra-wideband (UWB) performance, improved size, weight, and power (SWaP) characteristics, and provide functionality extending into the mmW regime. However, inherent to the current phased array paradigm is the inclusion of bulky and interferent electronic feed circuitry which has proven prohibitive in bringing these goals to fruition. ☐ In this work, a photonic solution is proposed to enable progress in these areas. An all-dielectric, fiber optic phased array feed is presented, which demonstrates inherent electromagnetic field immunity, small size and weight, and wide operational bandwidth. These feed properties enable the preservation of the theoretical UWB response and low-profile of a variety of high-performance antennas. To provide sufficient RF output power, high-power charge-compensated modified uni-traveling carrier (CC-MUTC) photodiodes are directly integrated into the feed points of these antennas. By properly designing the “photonic antennas” to compensate for the capacitive reactance and heat dissipation of the photodiodes, they are shown to demonstrate effective isotropic radiated power (EIRP) exceeding 1 W, and RF power conversion efficiency (PCE) approaching 50% close to mmW. ☐ A number of increasingly complex, high-power photonic phased array systems are studied for modern RF applications. Aperture coupled patch antennas (ACPAs) are designed for 22 and 28 GHz operation, which demonstrate near ideal performance metrics. A 28 GHz photonic ACPA array is also fabricated for narrowband 5G applications. Later, photonic connected array antennas are investigated, which realize efficient 5-20 GHz response, while retaining the excellent SWaP qualities of elementary dipole elements. The fiber optic feed is shown to mitigate common problems that inhibit the UWB operation of traditional electronic phased array antennas, such as scan blindness and unbalanced feeding. And lastly, a photonic tightly coupled array is fabricated, which improves antenna output power and beam steering through addition of a ground plane. Simulations indicate that large-scale photonic TCAs can have similar bandwidth performance to that of their electronic counterparts, while being more flexible in their potential physical deployment scenarios and operating bands of interest.

Download or read book Design and Analysis of Substrate integrated Cavity backed Antenna Arrays for Ku band Applications written by Mohamed Hamed Awida Hassan and published by . This book was released on 2011 with total page 237 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mobile communication has become an essential part of our daily life. We love the flexibility of wireless cell phones and even accept their lower quality of service when compared to wired links. Similarly, we are looking forward to the day that we can continue watching our favorite TV programs while travelling anywhere and everywhere including satellite channels and the wish list goes on. Mobility, flexibility, and portability are the themes of the next generation communication. Motivated and fascinated by such technology breakthroughs, this effort is geared towards enhancing the quality of wireless services and bringing mobile satellite reception one step closer to the market. On the other hand, phased array antennas are vital components for RADAR applications where the antenna is required to have certain scan capabilities. One of the main concerns in that perspective is how to avoid the potential of scan blindness in the required scan range. Targeting to achieve wideband wide-scan angle phased arrays free from any scan blindness our efforts is also geared. Conventionally, the key to lower the profile of the antenna is to use planar structures. In that perspective microstrip patch antennas have drawn the attention of antenna engineers since the 1970s due to their attractive features of being low profile, compact size, light weight, and amenable to low-cost PCB fabrication processes. However, patch elements are basically resonating at a single frequency, typically have

Download or read book Wideband Low profile Antenna Arrays written by Jonathan Doane and published by . This book was released on 2013 with total page 239 pages. Available in PDF, EPUB and Kindle. Book excerpt: Our fundamental bandwidth limits reveal for the first time the extent of the realizable design space for wideband low-profile arrays, and suggest there are significant opportunities for further improvement. Several practical techniques are also presented for increasing bandwidth and scanning performance while reducing the total size, weight and cost of the array. In summary, the ongoing development of high-performance wideband low-profile arrays will likely remain an important and fertile area of research for the foreseeable future.

Download or read book The Art and Science of Ultrawideband Antennas Second Edition written by Hans G. Schantz and published by Artech House. This book was released on 2015-06-01 with total page 591 pages. Available in PDF, EPUB and Kindle. Book excerpt: This comprehensive treatment of ultrawideband (UWB) antennas and time-domain microwave engineering serves as an invaluable practical reference for anyone involved in antenna and RF design work. This authoritative volume enables readers to select the proper UWB antennas for their applications, design and analyze UWB antennas, and integrate these antennas in an RF system. By applying time-domain thinking to problems of practical interest, the reader will not only learn how to build and analyze antennas, but also understand them at the most fundamental level. This second edition is updated and expanded throughout, providing readers with a history of antennas, numerous new problem sets and worked examples, along with new information on plotting time-domain field lines, time-domain reflectometry, matching techniques, and more. This book also addresses system issues like spectral control and antenna efficiency.

Download or read book The Art and Science of Ultrawideband Antennas written by Hans Schantz and published by Artech House Antennas and Prop. This book was released on 2005 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ultra-wideband (UWB) technology is on the cutting edge of contemporary wireless development and this comprehensive treatment of UWB antennas serves as an invaluable practical reference for your antenna and RF design work. Generously supported with over 200 equations and more than 200 illustrations, this authoritative volume enables you to select the proper UWB antennas for your applications, design and analyze UWB antennas, and integrate these antennas in an RF system.

Download or read book Novel Technologies and Techniques for Low cost Phased Arrays and Scanning Antennas written by Christopher Timothy Rodenbeck and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation introduces new technologies and techniques for low-cost phased arrays and scanning antennas. Special emphasis is placed on new approaches for low-cost millimeter-wave beam control. Several topics are covered. A novel reconfigurable grating antenna is presented for low-cost millimeter-wave beam steering. The versatility of the approach is proven by adapting the design to dual-beam and circular-polarized operation. In addition, a simple and accurate procedure is developed for analyzing these antennas. Designs are presented for low-cost microwave/millimeter-wave phased-array transceivers with extremely broad bandwidth. The target applications for these systems are mobile satellite communications and ultra-wideband radar. Monolithic PIN diodes are a useful technology, especially suited for building miniaturized control components in microwave and millimeter-wave phased arrays. This dissertation demonstrates a new strategy for extracting bias-dependent small-signal models for monolithic PIN diodes. The space solar-power satellite (SPS) is a visionary plan that involves beaming electrical power from outer space to the earth using a high-power microwave beam. Such a system must have retrodirective control so that the high-power beam always points on target. This dissertation presents a new phased-array architecture for the SPS system that could considerably reduce its overall cost and complexity. In short, this dissertation presents technologies and techniques that reduce the cost of beam steering at microwave and millimeter-wave frequencies. The results of this work should have a far-ranging impact on the future of wireless systems.