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Author : Pittungpay Appuhamylage Janaka Ratnasiri
Publisher :
ISBN 13 :
Total Pages : 172 pages
Book Rating : 4.:/5 (55 download)
Download or read book Wide Angle Slide Lobes of Reflector Antennas written by Pittungpay Appuhamylage Janaka Ratnasiri and published by . This book was released on 1969 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : P. A. J. Ratnasiri
Publisher :
ISBN 13 :
Total Pages : 59 pages
Book Rating : 4.:/5 (227 download)
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).
Author : Satish K. Sharma
Publisher : Artech House
ISBN 13 : 160807515X
Total Pages : 323 pages
Book Rating : 4.6/5 (8 download)
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.
Author :
Publisher :
ISBN 13 :
Total Pages : 34 pages
Book Rating : 4.:/5 (317 download)
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 : 9781721995134
Total Pages : 30 pages
Book Rating : 4.9/5 (951 download)
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 : S. H. Lee
Publisher :
ISBN 13 :
Total Pages : 105 pages
Book Rating : 4.:/5 (227 download)
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).
Author : Carlyle J. Sletten
Publisher : Artech House Publishers
ISBN 13 :
Total Pages : 464 pages
Book Rating : 4.F/5 ( download)
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:
Author : Carlyle J. Sletten
Publisher :
ISBN 13 :
Total Pages : 92 pages
Book Rating : 4.3/5 (91 download)
Download or read book The Theory of Reflector Antennas written by Carlyle J. Sletten and published by . This book was released on 1966 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : M. H. A. J. Herben
Publisher :
ISBN 13 : 9789061442523
Total Pages : 141 pages
Book Rating : 4.4/5 (425 download)
Download or read book Wide angle radiation pattern calculation of paraboloidal reflector antennas written by M. H. A. J. Herben and published by . This book was released on 1991 with total page 141 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Bijan Houshmand
Publisher :
ISBN 13 :
Total Pages : 244 pages
Book Rating : 4.:/5 (238 download)
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.
Author : Jacob W. M. Baars
Publisher : Springer Science & Business Media
ISBN 13 : 0387697349
Total Pages : 270 pages
Book Rating : 4.3/5 (876 download)
Download or read book The Paraboloidal Reflector Antenna in Radio Astronomy and Communication written by Jacob W. M. Baars and published by Springer Science & Business Media. This book was released on 2007-08-06 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt: Radio astronomers have developed techniques of calibration of large reflector antennas with radio astronomical methods, but these have not been comprehensively described. This text aims to fill this gap, taking a practical approach to the characterisation of antennas. All calculations and results in the form of tables and figures have been made with Mathematica by Wolfram Research. The reader can use the procedures for the implementation of his own input data.
Author : Alan J. Simmons
Publisher :
ISBN 13 :
Total Pages : 38 pages
Book Rating : 4.:/5 (227 download)
Download or read book Wide-angle Properties of Dual-reflector Antennas-experimental written by Alan J. Simmons and published by . This book was released on 1964 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two dual-reflector Cassegrain microwave systems were studied experimentally and theoretically for wide-angle performance at 9000 mc. The parabolic reflector diameter was 72 inches and the hyperbolic subdish diameter 14.4 inches in Case 1 (d/D = 0.2) and 21.6 inches in Case 2 (d/D = 0.3). In Case 1, a scan of 4 beamwidths off-axis was achieved with 3db drop in gain, in Case 2, 5 beamwidths. Sidelobe level on-axis for Case 1 was about 18db, for Case 2 about 14db. Scanning performance was in good agreement with theory. (Author).
Author : James Joseph Meyers
Publisher :
ISBN 13 :
Total Pages : 192 pages
Book Rating : 4.:/5 (125 download)
Download or read book Minimization of the Side Lobes of a Multi-feed Parabolic Reflector Antenna written by James Joseph Meyers and published by . This book was released on 1984 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Nelson A. Armas
Publisher :
ISBN 13 :
Total Pages : 69 pages
Book Rating : 4.:/5 (64 download)
Download or read book Low Sidelobe Reflector Antenna Design for Communications written by Nelson A. Armas and published by . This book was released on 1993 with total page 69 pages. Available in PDF, EPUB and Kindle. Book excerpt: The current antenna used in the Marine Radio AN/MRC-142 is a focal point fed reflector with a first sidelobe of -10 dB. A new antenna design is required with a sidelobe reduction of another 10 dB, and a minimum impact on the system upgrade cost. An improved feed consisting of a fed dipole and disk in the vicinity of a parasitic ring was designed for use with the current reflector. The disk acts as a ground plane for the dipole, with the ring narrowing the beamwidth. resulting in a stronger edge taper on the reflector. An existing computer code based on the method of moments was used to compute the gain and the radiation pattern. Circular parabolic reflectors of 36 inches and 48 inches were analyzed. The results show that the 36 inch reflector cannot satisfy the conditions over the entire frequency band (1350 to 1850 MHz) simultaneously. The 48 inch reflector came very close to satisfying all the conditions, although the sidelobe level is off by approximately 2 dB at wide angles in the H-plane.
Author : GEORGE R. EVANS
Publisher :
ISBN 13 :
Total Pages : 1 pages
Book Rating : 4.:/5 (227 download)
Download or read book Theory and Design of Spherical Reflector Antennas. Annotated Bibliography written by GEORGE R. EVANS and published by . This book was released on 1961 with total page 1 pages. Available in PDF, EPUB and Kindle. Book excerpt: A search was undertaken to collect published information on the use of a spherical reflector as a wide-angle antenna. The period generally covered is 1940 to the present. To make the bibliography more comprehensive and possibly more useful, articles and reports gathered during the search, but not directly applicable to the specific subject, are included. (Author).
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)
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...
Author :
Publisher :
ISBN 13 :
Total Pages : 1106 pages
Book Rating : 4.E/5 ( download)
Download or read book International Conference on Antennas and Propagation written by and published by . This book was released on 1989 with total page 1106 pages. Available in PDF, EPUB and Kindle. Book excerpt:
