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Analysis Of Reflector Antenna Systems For Wide Angle Scanning
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Book Synopsis Analysis of Reflector Antenna Systems for Wide-angle Scanning by : Bijan Houshmand
Download or read book Analysis of Reflector Antenna Systems for Wide-angle Scanning written by Bijan Houshmand and published by . This book was released on 1990 with total page 244 pages. Available in PDF, EPUB and Kindle. Book excerpt: A near-field Cassegrain reflector (NFCR) is an effective way to magnify a small phased array into a much larger aperture antenna for limited scan applications. Traditionally, the pattern analysis of NFCR is based on a plane wave approach. This approach simplifies the computation tremendously, but fails to provide design information about the most critical component of the whole antenna system, namely, the feed array. Here, each element in the feed array is considered individually and its diffraction pattern from the subreflector is computed by GTD. The field contributions from all elements are superimposed at the curved main reflector surface, and a physical optics integration is performed to obtain the secondary pattern. Beam-waveguide-fed Cassegrain reflector (BFCR) antennas are increasingly being used in space communication applications. Using a shooting and bouncing ray approach based on geometrical optics and aperture integration, the far-field pattern of the BFCR is calculated. This method is computationally efficient and is not restricted by the number of reflecting surfaces in the antenna configuration. The diffraction loss in the beam waveguide structure is calculated separately by the conventional near-field physical optics integration. The segmented mirror antenna is designed for the radiometer application on the planned NASA Earth Science Geostationary Platforms in the 1990s. The antenna consists of two parts: a regular parabolic dish of 5 m in diameter which converts the radiation from feeds into a collimated beam, and a movable mirror that redirects the beam to a prescribed scan direction. The mirror is composed of 28 segmented planar conducting plates, mostly one square meter in size. Based on a physical optics analysis, we have analyzed the secondary pattern of the antenna. For frequencies between 50 and 230 GHz, and for a scan range of $pm$ 8$spcirc$ (270 beamwidths scan at 230 GHz), the worst calculated beam efficiency is 95%. To cover such a wide frequency and scan range, each of the 28 plates is individually controlled for a tilting less than 4$spcirc$, and for a sliding less than 0.5 cm.
Book Synopsis A Comparison of Reflector Antenna Designs for Wide-angle Scanning by :
Download or read book A Comparison of Reflector Antenna Designs for Wide-angle Scanning written by and published by . This book was released on 1989 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Analysis of Reflector Antennas by : W. V. T. Rusch
Download or read book Analysis of Reflector Antennas written by W. V. T. Rusch and published by Academic Press. This book was released on 2013-10-22 with total page 191 pages. Available in PDF, EPUB and Kindle. Book excerpt: Analysis of Reflector Antennas provides information pertinent to the analysis of reflector-antenna systems. This book provides an understanding of how design data have been and can be derived. Organized into four chapters, this book begins with an overview of the history of focusing reflector-antenna systems characterized by a highly variable level of general interest. This text then examines the solutions of the scalar Helmholtz equation in rectangular and spherical coordinates. Other chapters consider antenna performance described in terms of several fundamental properties, including capture area, directivity, gain, beam efficiency, aperture efficiency, polarization, effective noise temperature, and phase center. This book discusses as well the resulting functional dependence between axial ratio and component amplitude, which is the same as that between voltage standing wave ratio and voltage reflection coefficient. The final chapter deals with the role of the special-purpose digital computers. This book is a valuable resource for research and development engineers.
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781721995134 Total Pages :30 pages Book Rating :4.9/5 (951 download)
Book Synopsis A Comparison of Reflector Antenna Designs for Wide-Angle Scanning by : National Aeronautics and Space Administration (NASA)
Download or read book A Comparison of Reflector Antenna Designs for Wide-Angle Scanning written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-28 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: Conventional reflector antennas are typically designed for up to + or - 20 beamwidths scan. An attempt was made to stretch this scan range to some + or - 300 beamwidths. Six single and dual reflector antennas were compared. It is found that a symmetrical parabolic reflector with f/D = 2 and a single circular waveguide feed has the minimum scan loss (only 0.6 dB at Theta sub 0 = 8 deg, or a 114 beamwidths scan). The scan is achieved by tilting the parabolic reflector by an angle equal to the half-scan angle. The f/D may be shortened if a cluster 7 to 19 elements instead of one element is used for the feed. The cluster excitation is adjusted for each new beam scan direction to compensate for the imperfect field distribution over the reflector aperture. The antenna can be folded into a Cassegrain configuration except that, due to spillover and blockage considerations, the amount of folding achievable is small. Zimmerman, M. and Lee, S. W. and Houshmand, B. and Rahmat-Samii, Y. and Acosta, R. Glenn Research Center; Jet Propulsion Laboratory RTOP 650-60-20...
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781723182631 Total Pages :190 pages Book Rating :4.1/5 (826 download)
Book Synopsis Integrated Reflector Antenna Design and Analysis by : National Aeronautics and Space Administration (NASA)
Download or read book Integrated Reflector Antenna Design and Analysis written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-18 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reflector antenna design is a mature field and most aspects were studied. However, of that most previous work is distinguished by the fact that it is narrow in scope, analyzing only a particular problem under certain conditions. Methods of analysis of this type are not useful for working on real-life problems since they can not handle the many and various types of perturbations of basic antenna design. The idea of an integrated design and analysis is proposed. By broadening the scope of the analysis, it becomes possible to deal with the intricacies attendant with modem reflector antenna design problems. The concept of integrated reflector antenna design is put forward. A number of electromagnetic problems related to reflector antenna design are investigated. Some of these show how tools for reflector antenna design are created. In particular, a method for estimating spillover loss for open-ended waveguide feeds is examined. The problem of calculating and optimizing beam efficiency (an important figure of merit in radiometry applications) is also solved. Other chapters deal with applications of this general analysis. The wide angle scan abilities of reflector antennas is examined and a design is proposed for the ATDRSS triband reflector antenna. The development of a general phased-array pattern computation program is discussed and how the concept of integrated design can be extended to other types of antennas is shown. The conclusions are contained in the final chapter. Zimmerman, M. L. and Lee, S. W. and Ni, S. and Christensen, M. and Wang, Y. M. Unspecified Center ANTENNA DESIGN; ELECTROMAGNETIC INTERFERENCE; REFLECTOR ANTENNAS; FIGURE OF MERIT; PHASED ARRAYS; RADIOMETERS; WAVEGUIDES...
Book Synopsis Handbook of Reflector Antennas and Feed Systems Volume I: Theory and Design of Reflectors by : Satish K. Sharma
Download or read book Handbook of Reflector Antennas and Feed Systems Volume I: Theory and Design of Reflectors written by Satish K. Sharma and published by Artech House. This book was released on 2013-07-01 with total page 323 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is the first truly comprehensive and most up-to-date handbook available on modern reflector antennas and feed sources for diversified space and ground applications. There has never been such an all-encompassing reflector handbook in print, and no currently available title offers coverage of such recent research developments. The Handbook consists of three volumes. Volume I provides a unique combination of theoretical underpinnings with design considerations and techniques. The need for knowledge in reflector antennas has grown steadily over the last two decades due to increased use in space and ground applications, as well as their high gain and wide bandwidth capabilities at relatively low cost. This volume brings you to the leading edge of developments in the field related to numerical techniques, classical reflector geometries, adaptive reflector antennas, shaped reflectors, bifocal and bicollimated dual reflectors, advanced reflectors, and reflect arrays. A must-have reference for both practicing engineers as well as academic researchers.
Book Synopsis Reflectarray Antennas by : Payam Nayeri
Download or read book Reflectarray Antennas written by Payam Nayeri and published by John Wiley & Sons. This book was released on 2018-02-23 with total page 426 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides engineers with a comprehensive review of the state-of-the-art in reflectarray antenna research and development. The authors describe, in detail, design procedures for a wide range of applications, including broadband, multi-band, multi-beam, contour-beam, beam-scanning, and conformal reflectarray antennas. They provide sufficient coverage of basic reflectarray theory to fully understand reflectarray antenna design and analysis such that the readers can pursue reflectarray research on their own. Throughout the book numerous illustrative design examples including numerical and experimental results are provided. Featuring in-depth theoretical analysis along with practical design examples, em style="mso-bidi-font-style: normal;"Reflectarray Antennas is an excellent text/reference for engineering graduate students, researchers, and engineers in the field of antennas. It belongs on the bookshelves of university libraries, research institutes, and industrial labs and research facilities.
Book Synopsis An Analysis of Stationary Henmispherical Reflectors Used as Narrow-beam, Wide-angle Scanning Antennas by : Lockheed Aircraft Corporation. Missiles and Space Division
Download or read book An Analysis of Stationary Henmispherical Reflectors Used as Narrow-beam, Wide-angle Scanning Antennas written by Lockheed Aircraft Corporation. Missiles and Space Division and published by . This book was released on 1959 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Reflector and Lens Antennas by : Carlyle J. Sletten
Download or read book Reflector and Lens Antennas written by Carlyle J. Sletten and published by Artech House Publishers. This book was released on 1988 with total page 464 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Journal of Research of the National Bureau of Standards by : United States. National Bureau of Standards
Download or read book Journal of Research of the National Bureau of Standards written by United States. National Bureau of Standards and published by . This book was released on 1960 with total page 832 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Modern Antenna Handbook by : Constantine A. Balanis
Download or read book Modern Antenna Handbook written by Constantine A. Balanis and published by John Wiley & Sons. This book was released on 2011-09-20 with total page 1617 pages. Available in PDF, EPUB and Kindle. Book excerpt: The most up-to-date, comprehensive treatment of classical and modern antennas and their related technologies Modern Antenna Handbook represents the most current and complete thinking in the field of antennas. The handbook is edited by one of the most recognizable, prominent, and prolific authors, educators, and researchers on antennas and electromagnetics. Each chapter is authored by one or more leading international experts and includes cover-age of current and future antenna-related technology. The information is of a practical nature and is intended to be useful for researchers as well as practicing engineers. From the fundamental parameters of antennas to antennas for mobile wireless communications and medical applications, Modern Antenna Handbook covers everything professional engineers, consultants, researchers, and students need to know about the recent developments and the future direction of this fast-paced field. In addition to antenna topics, the handbook also covers modern technologies such as metamaterials, microelectromechanical systems (MEMS), frequency selective surfaces (FSS), and radar cross sections (RCS) and their applications to antennas, while five chapters are devoted to advanced numerical/computational methods targeted primarily for the analysis and design of antennas.
Book Synopsis A GTD Analysis of the Circular Reflector Antenna Including Feed and Strut Scatter by : S. H. Lee
Download or read book A GTD Analysis of the Circular Reflector Antenna Including Feed and Strut Scatter written by S. H. Lee and published by . This book was released on 1977 with total page 105 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recently, the wide angle side lobes of a circular reflector antenna pattern were calculated by the Geometrical Theory of Diffraction and an overall pattern can be obtained from a combination of GTD and aperture integration methods. In this report, the analysis is extended to include the scattering from the feed supports. The feed support scattering is treated using the concept of equivalent current line source. The cylinder scattering model developed in this report gives the effect of strut scattering on the wide angle side lobes of the reflector. The scattering from the feed struts always has its greatest effect near the scattering cones for each strut. These scattering cones usually give rise to a maximum aperture blockage effect in certain off-principal plane patterns. The analysis given here can be used to compute the complete pattern of any arbitrary plane cut for a practical circular reflector antenna system. (Author).
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1990 with total page 996 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Wave Propagation written by Andrey Petrin and published by BoD – Books on Demand. This book was released on 2011-03-16 with total page 584 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book collects original and innovative research studies of the experienced and actively working scientists in the field of wave propagation which produced new methods in this area of research and obtained new and important results. Every chapter of this book is the result of the authors achieved in the particular field of research. The themes of the studies vary from investigation on modern applications such as metamaterials, photonic crystals and nanofocusing of light to the traditional engineering applications of electrodynamics such as antennas, waveguides and radar investigations.
Book Synopsis The Telecommunications and Data Acquisition Progress Report by :
Download or read book The Telecommunications and Data Acquisition Progress Report written by and published by . This book was released on 1994-10 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Wiley Encyclopedia of Telecommunications by :
Download or read book Wiley Encyclopedia of Telecommunications written by and published by . This book was released on 2003 with total page 578 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Journal of Research by : United States. National Bureau of Standards
Download or read book Journal of Research written by United States. National Bureau of Standards and published by . This book was released on 1959 with total page 1136 pages. Available in PDF, EPUB and Kindle. Book excerpt:
