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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TL;DR: An optimum design with measured results of a tracking feed operating in 3.4 to 4.2 GHz for downlink and 6.3 to 6.8 GHz for uplink for an 11-m diameter dual shaped Cassegrain antenna is presented here.
Abstract: Monopulse tracking using multiple horns is an attractive and low-cost option for a ground station feed. In this paper, a compact design of this type of feed operating in dual band is discussed. This design uses dielectric rod elements as radiators. Four elements in 2 × 2 array configuration operate for downlink reception and tracking application. One single element with high gain at the center of the array operates for uplink using high power. This allows some design flexibility with respect to independence in configuring the two chains and also provides some inbuilt isolation between them. However, there are issues in this configuration with respect to the mutual coupling between the elements. These are addressed in detail and an optimum design with measured results of a tracking feed operating in 3.4 to 4.2 GHz for downlink and 6.3 to 6.8 GHz for uplink for an 11-m diameter dual shaped Cassegrain antenna is presented here.
23 citations
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TL;DR: In this paper, a primary-fed offset reflector antenna with the potential of radiating circular as well as elliptical beams with low cross-polarization is proposed, where the reflector is fed by a horn with a phase-correcting lens in the aperture.
Abstract: A novel compact primary-fed offset reflector antenna with the potential of radiating circular as well as elliptical beams with low cross-polarization, is proposed. The reflector is fed by a horn with a phase-correcting lens in the aperture. Compared to the dual-reflector offset antenna, the concept is easier to assemble and mechanically more robust. The antenna has been synthesized and analyzed by computer programs resulting from modifications of corresponding PO programs for dual-reflector offset antennas. The synthesized antenna exhibits similar cross-polarization, side-lobe level, and aperture efficiency as those of dual-reflector offset antennas, although the one-to-one correspondence between zero cross-polarization and conformal mapping from the feed to the aperture, is not exactly valid for this approach. >
23 citations
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TL;DR: In this article, a novel high-isolation 35/94-GHz dual-frequency orthogonal Cassegrain antenna is designed, which consists of a D = 800mm main reflector, a subreflector, and a dual-band orthogonality feed.
Abstract: In this letter, a novel high-isolation 35/94-GHz dual-frequency orthogonal Cassegrain antenna is designed. The antenna consists of a D = 800 mm main reflector, a subreflector, and a dual-band orthogonal-polarization feed. In order to get similar feed horn's E – H radiation patterns and similar phase center positions at the dual frequencies separately, the dual-mode conical horn is designed in the feed. For obtaining a high isolation, a three-order low-pass filter is designed in the Ka-band waveguide feed port. The measured antenna gains are 43.6 and 51.3 dBi, and the sidelobe levels are −27.5 and −26.5 dB at 35 and 94 GHz, respectively. The isolation between the two ports is −61.0 dB in the Ka-band and −63.5 dB in the W-band. The proposed antenna is a suitable candidate for a dual-band radar system.
23 citations
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TL;DR: In this paper, the phase center of the EBG antennas is calculated and the position and the frequency evolution of this parameter is studied, and the performances of such a feed associated with a Side Fed Offset Cassegrain Antenna (SFOCA) are evaluated and compared with a classical feed for reflector, a Potter horn, a
Abstract: Recent studies have shown that the electromagnetic band gap (EBG) antenna can be used to feed a reflector, especially to realize multibeam coverage with geostationary satellite. However, it is necessary to evaluate its performances in terms of aperture efficiency to compare this solution to the classical ones. Among all the parameters which contribute to the aperture efficiency, one of the most important is the phase center, which has never been determined for EBG antennas. This is the aim of this letter. After defining a simple method to calculate the phase center of the EBG antennas, the position and the frequency evolution of this parameter will be studied. Then, the performances of such a feed associated with a Side Fed Offset Cassegrain Antenna (SFOCA) will be evaluated and compared with a classical feed for reflector, a Potter horn
23 citations
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20 Jul 2009
TL;DR: In this article, an improved single antenna system that allows reception of RF energy at multiple frequencies is presented, which is capable of providing movement such that the feed horn with the LNB is at a focal point with the primary reflector for both Ka and Ku band reception.
Abstract: The present invention provides an improved single antenna system that allows reception of RF energy at multiple frequencies. In one embodiment, the antenna is implemented as a multi-beam, multi-feed antenna having a primary reflector fitted with a dual mode feed tube and a switchable LNB that supports both Ka band and Ku band reception. In another embodiment, the antenna is implemented as a multi-beam, multi-feed antenna having a primary reflector fitted with a feed horn and a LNB that is capable of providing movement such that the feed horn with the LNB is at a focal point with the primary reflector for both Ka and Ku band reception. In another embodiment, the antennae is implemented as a multi-beam, multi-feed antenna having a primary reflected fitted with a feed horn assembly and a switchable LNB that supports both Ka band and Ku band reception.
23 citations