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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
14 Dec 1999
TL;DR: In this paper, a reflector antenna system with multiple feeds each operating in a separate frequency band is described, where the antenna system includes a main parabolic reflector and an ellipsoidal subreflector configured in a Gregorian arrangement.
Abstract: A reflector antenna system with multiple feeds each operating in a separate frequency band. The antenna system includes a main parabolic reflector and an ellipsoidal subreflector configured in a Gregorian arrangement. Mutual blockage between the multiple feeds is reduced by their orientation and arrangement. The system includes a transversely positioned feed and an axial feed located in the focal region of the main reflector. The transverse feed may be integral with the subreflector. The system also includes a third feed placed at the virtual focal point of the subreflector.

169 citations

Patent
14 Dec 2009
TL;DR: In this paper, a feed assembly for a parabolic dish reflector is described, which includes a waveguide cavity locatable at the focal point, or any other desired off-boresight location corresponding point.
Abstract: A feed assembly for a parabolic dish reflector is described. The feed assembly includes a waveguide cavity locatable at the focal point, or any other desired off-boresight location corresponding point, of the parabolic dish, at least one first radiating element optimized for operation at a first frequency band and provided on a top surface of the waveguide cavity, and a plurality of second radiating elements each optimized for operation at a second band of frequencies and provided on the top surface of the waveguide cavity.

167 citations

Proceedings ArticleDOI
20 Jun 1994
TL;DR: In this article, a microstrip reflectarray using patches of variable size is proposed, and several important performance criteria are compared with the standard parabolic reflector and the microstrip array.
Abstract: In a great number of microwave applications a highly directive antenna with a main beam scanned to a certain angle is required. To achieve this a certain aperture illumination with progressive phasing is used. The two primary ways to do this are reflectors and arrays. The reflector antenna uses its geometry to create the desired phase across the aperture, while the array employs distinct elements fed with progressive phasing. Reflector antennas are advantageous in the fact that they typically exhibit large bandwidth and low loss. The main disadvantage of the reflector is the geometrical constraint it imposes on the design. The most popular reflector, the parabolic reflector, also exhibits inherently high cross polarization levels. Microstrip patch arrays are lightweight, low-profile antennas that are capable of low cross polarization levels but typically have small bandwidth and fairly large loss at microwave frequencies. The more attractive features of reflectors and arrays are combined in the reflectarray. The steps taken in the design of a microstrip reflectarray using patches of variable size are outlined. Measured and theoretical results are shown for the finished design, and several important performance criteria are compared with the microstrip reflectarray.

164 citations

Patent
Tits Daniel G1
17 Jul 2002
TL;DR: In this paper, an Interactive Satellite Terminal antenna system consisting of an antenna to which is associated a feed horn is described, which is characterized in that it comprises an elliptical parabolic main reflector and a corrugated feed horn having an outer elliptical aperture and an inner cylindrical waveguide with an inner portion and a step section.
Abstract: The invention relates to a Interactive Satellite Terminal antenna system comprising an antenna to which is associated a feed horn. This antenna systems characterized in that it comprises an elliptical parabolic main reflector and a corrugated feed horn ( 2 ) having an outer elliptical aperture and an inner cylindrical waveguide with an inner portion ( 7 ) and a step section ( 8 ) and in that cavity elements ( 10 ) are added to the step section ( 8 ) for compensating cross-polar components. The invention can be used in antenna systems.

163 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202318
202267
202111
202018
201920
201824