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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Papers
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12 Nov 1999
TL;DR: In this article, an offset parabolic reflector has an increased focal length (FL) and/or an increased FL/D (where D is a diameter of the reflector) in order to improve off-axis performance of the system.
Abstract: A multiple beam antenna system including an offset parabolic reflector has an increased focal length (FL) and/or an increased FL/D (where D is a diameter of the reflector) in order to improve off-axis performance of the system. In certain embodiments, the system can simultaneously receive different signals from different satellites that are orbitally spaced.
7 citations
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TL;DR: In this article, a novel method to determine feed adjustment amounts based on far field is proposed, with no need to know the deformation of the reflector, and the proposed method is also employed to determine the feed installation error, which is adopted instead of fitting parameters to describe the aperture phase error.
Abstract: To improve the electrical properties of a reflector antenna, the reflector surface distortion is compensated to some extent and the feed installation error is reduced by adjusting the feed position based on far field. Considering the fact that the traditional method of best-fit paraboloid needs to obtain the accurate reflector deformation beforehand, a novel method to determine feed adjustment amounts based on far field is proposed, with no need to know the deformation. Based on aperture field method, explicit expressions of the sensitivity of far field to fitting parameters of the distorted reflector are established. Then fitting parameters and far field are linked with over-determined linear equations, and by measuring far field, the reflector deformation is approximately calculated based on least square method thereby providing guidance for the feed adjustment of the deformed reflector. In addition, the proposed method is also employed to determine the feed installation error, which is adopted instead of fitting parameters to describe the aperture phase error. Simulation cases show the correctness of the proposed method and the validity of the compensation of reflector distortion and the accurate installation of the feed.
7 citations
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TL;DR: In this article, the focusing of millimeter-wave radiation from a high power 60 GHz gyrotron was studied using a two-dimensional ellipso-parabolic focusing antenna system.
Abstract: The focusing of millimeter-wave radiation from a high power 60 GHz gyrotron is studied using a two-dimensional ellipso-parabolic focusing antenna system. Fine focusing with an elliptic reflector gives a sheet beam of about 10 mm in thickness even at a high power input of about 100 kW. The addition of a parabolic reflector produces a finely focused and nearly Gaussian beam of about 10 mm in diameter with an energy density higher than lOOkWcm-2. Spatial distributions of beam power are compared with calculations and good agreement is obtained.
7 citations
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23 Apr 2008
TL;DR: In this paper, the design of a highly effective parabolic dish antenna primary feed based on backward radiation is described, which can support both linear and circular polarization and may be directly attached to a circular waveguide.
Abstract: This paper describes the design of a highly effective parabolic dish antenna primary feed based on backward radiation. This assembly, comprising a dielectric lens and reflecting plate, supports both linear and circular polarization and may be directly attached to a circular waveguide. The current design is intended to work in the 10 GHz band with the specified parabolic dish antenna.
7 citations
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22 Jan 2002TL;DR: A self-pointing antenna has a reflector, a feed or a sub-reflector and a plurality of support struts coupled between the reflector and the boom arm as discussed by the authors.
Abstract: A self-pointing antenna has a reflector, a feed or a sub-reflector and a plurality of support struts coupled between the reflector and the boom arm and supporting the feed or sub-reflector. At least one actuator is operatively coupled with the support struts for adjusting the position of the feed or sub-reflector relative to the reflector so as to selectively adjust either/or both of the beam elevation and azimuth of a main beam axis of the antenna.
7 citations