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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TL;DR: In this article, a method of designing reflector surfaces by the geometrical-optics approximation is introduced, in which a given generalised far field is realized when the reflector is illuminated by a point source.
Abstract: A method of designing reflector surfaces by the geometrical-optics approximation is introduced, in which a given generalised far field is realised when the reflector is illuminated by a point source. The problem is shown to be reduced to solving a nonlinear 2nd-order partial differential equation of the Monge-Ampere type. A computed example is given.
9 citations
10 Apr 2016
TL;DR: In this paper, a dual-polarization offset reflector antenna that has a feed antenna composed of a 2 × 2 microstrip antenna array was designed for 12 GHz band satellite broadcasting reception.
Abstract: A 12-GHz (11.7 to 12.75 GHz) band satellite service with dual-circular polarization has been studied for transmission channels to deliver advanced broadcasting services such as 8K Super Hi-Vision in Japan. A right- and left-hand circularly polarized parabolic reflector antenna will make it possible to receive the services provided over the dual-circular polarization with a single reflector antenna. We manufactured and tested a dual-polarization offset reflector antenna that has a feed antenna composed of a 2 × 2 microstrip antenna array. Measured results showed that the antenna gain was 33.7 dBi and that the cross polarization discrimination was 25 dB. This demonstrates that our design is valid for a dual-circularly polarized antenna for 12-GHz band satellite broadcasting reception.
9 citations
Patent•
04 Mar 1983TL;DR: A beam scanning antenna system as discussed by the authors uses a small, rapidly rotatable feed enna to illuminate a large, fixed secondary collimating device, such as a reflector or electromagnetic lens, which in turn illuminates a fixed primary collimating devices.
Abstract: A beam scanning antenna system that uses a small, rapidly rotatable feed enna to illuminate a large, fixed secondary collimating device, such as a reflector or electromagnetic lens, which in turn illuminates a large, fixed primary collimating device. The primary collimating device forms a narrow collimating beam that is reflected or transmitted into space. Rotation of the small feed antenna causes the beam to scan.
9 citations
TL;DR: In this paper, the phase of the elements of a phased array feed is optimized to yield a maximum directivity for front fed and offset cylindrical parabolic reflector antennas, especially for front-fed reflectors with larger feeds.
Abstract: The phase of the elements of a phased array feed is optimized to yield a maximum directivity for front fed and offset cylindrical parabolic reflector antennas. Calibration improves the reflector antenna performance, especially for front fed reflectors with larger feeds.
9 citations
07 Aug 2002
TL;DR: In this article, the authors describe a feed for an 18.3 m Cassegrain antenna operating simultaneously at C-Band and Ku-Band at the same time using a quadrature junction, which can switch between circular and linear polarization and adjust the linear polarization angle independently in each band.
Abstract: In satellite communications, single frequency band systems with narrow bandwidth have gradually evolved into multi-band antenna systems with ever increasing bandwidth. Additional characteristics for earth stations are dual polarization, CP/LP switching, and TE/sub 21/ monopulse tracking, all integrated behind a common horn aperture. In the course of designing a multi-band feed system, a common wide-band orthomode transducer (OMT) followed by a series of diplexers or triplexers is often considered. However, such a design fails to work if the total operating frequency band goes beyond the bandwidth capabilities of the common OMT. A different approach is to separate polarization and frequency at the same time using a quadrature junction. The paper describes a feed for an 18.3 m Cassegrain antenna operating simultaneously at C-Band and Ku-Band. The system is able to switch between circular and linear polarization and, furthermore, to adjust the linear polarization angle independently in each band. Measured feed test results and calculated reflector performance are reported.
9 citations