The Short Backfire Antenna
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The Short Backfire Antenna
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Author : Hermann W. Ehrenspeck
language : en
Publisher:
Release Date : 1965
The Short Backfire Antenna written by Hermann W. Ehrenspeck and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1965 with Antennas (Electronics) categories.
The Short Backfire Antenna As An Element For High Gain Arrays
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Author : Hermann W. Ehrenspeck
language : en
Publisher:
Release Date : 1971
The Short Backfire Antenna As An Element For High Gain Arrays written by Hermann W. Ehrenspeck and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1971 with Antenna arrays categories.
The short backfire (SBF) antenna consisting of a large reflector illuminated by a dipole feed and smaller disk reflector produces a gain of 15 dB above isotropic. As an array element it has been efficiently adapted for various configurations of high-gain antennas producing gains of up to 25 dB, with a single SBF element capable of replacing four to six elements of a conventional multidipole array. Farfield patterns and directivity measurements are presented for a single element and for a twin element mounted on a common reflector. Optimized dimensions for both cases are discussed for possible application to more complex types of antennas.
The Modified Short Backfire Antenna
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Author : Finn A. Hass
language : en
Publisher:
Release Date : 1971
The Modified Short Backfire Antenna written by Finn A. Hass and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1971 with categories.
Measurements have shown it possible to increase the gain of the short backfire antenna significantly in different ways: (1) By increasing the size of the reflectors. (2) By placing extra reflectors in multiples of a half wavelength from the surface wave reflector. (3) By placing a quarter-wave ring in front of the surface of the wave reflector. The surface of the ring is perpendicular to the reflector and the ring has the same diameter as the reflector. The distance between the ring and the reflector giving maximum gain depends on the size and the number of the reflectors. The choice of parameters (size of reflectors) was based on numerical calculations using a theory developed by Drago Neilsen and Pontoppidan at the contracting laboratory. Measurements have shown a decrease in impedance bandwidth product. The levels of the backward lobe and the side lobes are increased, too, but the levels are kept at an acceptable height due to the influence of the quarter-wave ring. The beamwidths in E- and H-plane tend to be equal with increasing gain. This is an advantage if circular polarization is wanted. The modified short backfire antenna has a higher gain than any other backfire antenna of the same size (same length and diameter of the surface wave reflector). The antenna is easy to construct. (Author).
The Short Backfire Antenna A Numerical Physical Optics Study Of Its Characteristics
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Author : Tsing-Zone Hsieh
language : en
Publisher:
Release Date : 1971
The Short Backfire Antenna A Numerical Physical Optics Study Of Its Characteristics written by Tsing-Zone Hsieh and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1971 with categories.
A numerical-physical optics method is applied to study the circuit (impedance) and radiation characteristics of the short-backfire antenna. This radiator, developed through extensive experimentation by AFCRL, consists of a dipole exciter located between a large rimmed reflector and a small secondary reflector. It has wide bandwidth and high directivity comparable to sophisticated reflector antennas. In the numerical-physical optics method, the following steps are followed: (1) a set of coupled integral equations for the currents excited in the dipole and on the surface of the secondary reflector are formulated and solved numerically, assuming for this step that the large reflector is infinite; (2) the surface currents of the large reflector are approximated by a truncated form of those calculated for the infinite conducting sheet; (3) the radiation field maintained by the currents of the steps (1) and (2) is calculated; and (4) a diffracted field correction is made to account for the finite dimensions of the large reflector and its rim. This method has the advantage, relative to earlier studies, that it can successfully predict the antenna's circuit characteristics. Excellent results are obtained for both square and circular geometries. Comparison is made with experimental measurements made by AFCRL. (Author).
Influence Of Variation Of Backfire Antenna Parameters Ii Short Backfire Antenna
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Author : Erik Drago Nielsen
language : en
Publisher:
Release Date : 1970
Influence Of Variation Of Backfire Antenna Parameters Ii Short Backfire Antenna written by Erik Drago Nielsen and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1970 with categories.
A large number of numerical and experimental results showing the influence of a variation of the antenna parameters on the radiation properties of a short-backfire antenna are presented. These results may be very useful for the design of such antennas. The numerical results were calculated on a digital computer using a previously published theory for backfire antennas with dipole elements. The experimental results were measured in a radio anechoic chamber. Other numerical results were obtained, which show that the radiation properties of the short-backfire antenna correspond to those of open resonators. Finally, a number of computations were carried out in order to investigate the possibility of applying the short-backfire antenna as the excitation system of a Yagi antenna. (Author).
The Short Backfire Antenna As An Element For High Gain Arrays
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Author : Hermann W. Ehrenspeck
language : en
Publisher:
Release Date : 1971
The Short Backfire Antenna As An Element For High Gain Arrays written by Hermann W. Ehrenspeck and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1971 with Antenna arrays categories.
The short backfire (SBF) antenna consisting of a large reflector illuminated by a dipole feed and smaller disk reflector produces a gain of 15 dB above isotropic. As an array element it has been efficiently adapted for various configurations of high-gain antennas producing gains of up to 25 dB, with a single SBF element capable of replacing four to six elements of a conventional multidipole array. Farfield patterns and directivity measurements are presented for a single element and for a twin element mounted on a common reflector. Optimized dimensions for both cases are discussed for possible application to more complex types of antennas.
The Research On Short Backfire Antenna
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Author : C. L. Lin
language : en
Publisher:
Release Date : 1983
The Research On Short Backfire Antenna written by C. L. Lin and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1983 with categories.
Literature Survey On Short Backfire Antennas
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Author : Jan Kinberg
language : en
Publisher:
Release Date : 1976
Literature Survey On Short Backfire Antennas written by Jan Kinberg and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1976 with categories.
Influence Of Variation Of Backfire Antenna Parameters 1
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Author : Erik Drago Nielsen
language : en
Publisher:
Release Date : 1970
Influence Of Variation Of Backfire Antenna Parameters 1 written by Erik Drago Nielsen and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1970 with categories.
A large number of numerical results for Yagi backfire antennas are presented, from which the influence of a variation of the antenna parameters may be deducted. The results were obtained by means of a previously described theory for backfire antennas with dipole elements, and the numerical computations were carried out on a digital computer. Samples of the numerical results were compared with experimental results obtained in a radio anechoic chamber. Finally, the influence of small changes in the general Yagi backfire antenna structure, such as changing the single dipole reflector elements into a half-transparent or solid conducting plate or changing the array of equally long dipole director elements into a tapered array, was investigated. (Author).
A Short Backfire Antenna Fitted With A Waveguide Feed
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Author : John A. Strom
language : en
Publisher:
Release Date : 1976
A Short Backfire Antenna Fitted With A Waveguide Feed written by John A. Strom and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1976 with categories.
A short backfire antenna incorporating an open-ended waveguide as its feed mechanism has been measured experimentally in three different structural configurations. A complete set of curves describing the directivity, sidelobe levels, and half-power beamwidths as a function of frequency, as well as a few of the more important radiation patterns, are presented for each case. The effects obtained by varying parameters such as disk diameter and waveguide spacing are discussed, especially with regard to the directive gain and area illumination efficiency. Recommendations are made on techniques for fabrication, impedance-matching, and arraying antennas of this type for possible airframe applications. (Author).