Topic
Cassegrain antenna
About: Cassegrain antenna is a research topic. Over the lifetime, 3207 publications have been published within this topic receiving 28278 citations.
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Patent•
15 Dec 1978
TL;DR: In this article, a parabolic main reflector and two hyperbolic auxiliary reflectors with a focal point of one in a focal plane of the other were used for tracking radars.
Abstract: Cassegrain type reception cone scanning antenna system comprising a parabolic main reflector (1) and two hyperbolic auxiliary reflectors (3, 4) with a focal point of one in a focal plane of the other. One of these reflectors (3) is semi-transparent and the other (4) is rotated around an axis (54) inclined relative to the focal axis (ox) of the system. Application to tracking radars.
8 citations
TL;DR: In this article, an additional subreflector is introduced between the Gregorian corrector and the spherical reflector, in order to cause the power of the feed horn to be uniformly distributed over the main reflector aperture.
Abstract: A technique is proposed for raising the efficiency of sphereical-reflector antennas embodying the Gregorian method of phase correction. The method is based on the Galindo-Williams modified Cassegrain antenna. An additional subreflector is introduced between the Gregorian corrector and the spherical reflector, in order to cause the power rom the feed horn to be uniformly distributed over the main reflector aperture. Equations are presented which enable the co-ordinates of the subreflectors to be computed. Two examples are given and a theoretical effieciency of 93% is predicted in one case.
8 citations
Proceedings Article•
08 Apr 2013
TL;DR: In this paper, four quadruple-ridged flared horn designs achieving 6-1 frequency bandwidth with good match and near-constant beamwidth in E- and D-planes were presented.
Abstract: In this paper, we present four quadruple-ridged flared horn designs achieving 6-1 frequency bandwidth with good match and near-constant beamwidth in E- and D-planes. Nominal 10 dB beamwidths of the designs range from 32 to 115 degrees. Such design flexibility makes the quad-ridge horn a very attractive reflector antenna feed candidate, especially for next generation radio telescopes.
8 citations
TL;DR: In this paper, the performance of single offset compact antenna test ranges with different reflector edge treatments and rim shapes was compared using the physical optics technique, and a comparison between reflector edges taper and rim serrations in controlling edge diffraction was demonstrated.
Abstract: The physical optics technique is used to compare the performance of single offset compact antenna test ranges with different reflector edge treatments and rim shapes. A comparison between reflector edge taper and rim serrations in controlling edge diffraction is demonstrated.
8 citations
TL;DR: This paper demonstrates a Ku-band medium and long distance microwave wireless energy transmission system based on the rectifier diode, which is likely to be used in unmanned aerial vehicle hovering charging system, robot charging while working, isolated island wireless power supplying and wireless charging of various sensors.
Abstract: This paper demonstrates a Ku-band medium and long distance microwave wireless energy transmission system based on the rectifier diode. The transmitting compact Cassegrain antenna with an aperture of 1.5m forms a more centralized and uniform 2m x 2m field zone, which has more than 80% transmission efficiency. According to the distribution of receiving field, the multiple ways synthesizers connected to rectangular patch arrays are designed. And the results predict that the receiving efficiency of the antenna is directly related to the performance of the system, which reaches 50%, not including the possible insert loss. Besides, the Ku-band rectifying circuit is optimized and measured, and the comparing results show that the practical rectifier diode can obtain more than 40% conversion efficiency at the operating frequency of 12.75GHz. Finally, the microwave wireless energy transmission system is designed, and it finally obtains 4% DC-DC conversion efficiency at a distance of 60m, which is likely to be used in unmanned aerial vehicle hovering charging system, robot charging while working, isolated island wireless power supplying and wireless charging of various sensors.
8 citations