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A Comparison Of Reflector Antenna Designs For Wide Angle Scanning
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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...
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:
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 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 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 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 1994 with total page 772 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 729 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 Monthly Catalogue, United States Public Documents by :
Download or read book Monthly Catalogue, United States Public Documents written by and published by . This book was released on 1991 with total page 1430 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Monthly Catalog of United States Government Publications by :
Download or read book Monthly Catalog of United States Government Publications written by and published by . This book was released on with total page 1042 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Millimetre Wave Antennas for Gigabit Wireless Communications by : Kao-Cheng Huang
Download or read book Millimetre Wave Antennas for Gigabit Wireless Communications written by Kao-Cheng Huang and published by John Wiley & Sons. This book was released on 2008-10-13 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt: Complete and comprehensive application-focused reference on millimetre wave antennas Millimetre Wave Antennas for Gigabit Wireless Communications covers a vast wealth of material with a strong focus on the current design and analysis principles of millimetre wave antennas for wireless devices. It provides practising engineers with the design rules and considerations required in designing antennas for the terminal. The authors include coverage of new configurations with advanced angular and frequency filtering characteristics, new design and analysis techniques, and methods for filter miniaturization. The book reviews up-to-date research results and utilizes numerous design examples to emphasize computer analysis and synthesis whilst also discussing the applications of commercially available software. Key Features: Advanced and up-to-date treatment of one of the fastest growing fields of wireless communications Covers topics such as Gigabit wireless communications and its required antennas, passive and active antenna design and analysis techniques, multibeam antennas and MIMO, IEEE 802.15.3c, WiMedia®, and advanced materials and technologies Offers a practical guide to integrated antennas for specific configurations requirements Addresses a number of complex, real-world problems that system and antenna engineers are going to face in millimetre-wave communications industry and provides solutions Contains detailed design examples, drawings and predicted performance This book is an invaluable tool for antenna professionals (engineers, designers, and developers), microwave professionals, wireless communication system professionals, and industries with microwave and millimetre wave research projects. Advanced students and researchers working in the field of millimetre wave engineering will also find this book very useful.
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 The Wide Angle Side Lobes of Reflector Antennas by : P. A. J. Ratnasiri
Download or read book The Wide Angle Side Lobes of Reflector Antennas written by P. A. J. Ratnasiri and published by . This book was released on 1970 with total page 59 pages. Available in PDF, EPUB and Kindle. Book excerpt: The complete pattern of a parabolic reflector antenna was calculated using the singly-diffracted rays of the geometrical theory of diffraction, with proper corrections for the forward and real axial directions. Excellent agreement with experimental patterns can be expected, if the aperture blockage is not significant. The solution has the usual advantages of a solution based on the geometrical theory of diffraction, namely, it is obtained in the form of simple functions, its computation cost is low, it is directly related to the radiation mechanism of the antenna and so it can be readily used in the design problem, and it can be easily extended and modified as the need arises. (Author).
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 Large Space Structures & Systems in the Space Station Era by :
Download or read book Large Space Structures & Systems in the Space Station Era written by and published by . This book was released on 1991 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis International Symposium Digest, Antennas and Propagation by :
Download or read book International Symposium Digest, Antennas and Propagation written by and published by . This book was released on 1989 with total page 600 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Antenna Systems for Modern Wireless Devices by : Shiban K. Koul
Download or read book Antenna Systems for Modern Wireless Devices written by Shiban K. Koul and published by Springer Nature. This book was released on with total page 344 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis 1989 International Symposium Digest by :
Download or read book 1989 International Symposium Digest written by and published by . This book was released on 1989 with total page 598 pages. Available in PDF, EPUB and Kindle. Book excerpt:
