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Feed horn

About: Feed horn is a research topic. Over the lifetime, 2395 publications have been published within this topic receiving 26548 citations. The topic is also known as: feedhorn.


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Patent
14 Apr 1983
TL;DR: In this article, an aperture transformation sidelobe canceller includes a plurality of auxiliary feed elements disposed in the vicinity of, but critically offset from, a main feed horn, and the signal paths for the auxiliary feed horns are coupled through a low loss cascade RF variable direction coupler network to be combined with the RF signal path for the main antenna feed.
Abstract: An aperture transformation sidelobe canceller includes a plurality of auxiliary feed elements disposed in the vicinity of, but critically offset from, a main feed horn. The signal paths for the auxiliary feed horns are coupled through a low loss cascade RF variable direction coupler network to be combined with the RF signal path for the main antenna feed. The combined signal path is coupled to a performance monitoring processor which, in turn, adjusts the coupling action of each variable directional coupler to achieve the necessary weighting and combining of the auxiliary feed signal paths. The critically offset auxiliary feed elements provide the capability of achieving very broadband and deep nulls from the simple variable directional coupler network. The null availability makes it possible to null the entirety of the main elements sidelobe region, including backlobe and even the first sidelobe region of the antenna pattern, as the offset auxiliary feed horns provide substantial coverage in this region. These offset auxiliary feed elements provide low differential dispersion, require reduced waveguide runs, enjoy polarization diversity by slightly depolarizing and rotating each feed and suffer essentially no grating problems.

23 citations

Journal ArticleDOI
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

Journal ArticleDOI
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

Journal ArticleDOI
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

Patent
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


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202313
202254
202123
202024
201934
201841