Topic
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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26 Mar 2012
TL;DR: In this article, a novel method to form multiple high-sensitivity beams with a reflector-based radio telescope is proposed to accurately reconstruct the polarization state of the incident radio waves, the beam patterns of the PAF are of crucial importance.
Abstract: A novel method to form multiple high-sensitivity beams with a reflector based radio telescope is to use a phased array feed (PAF). To accurately reconstruct the polarization state of the incident radio waves, the beam patterns of the PAF are of crucial importance. The co- and cross-polar element patterns of an oversampled L-band PAF prototype system have been measured in an interferometric setup. It is demonstrated that, although the antenna elements sampling the two orthogonal polarizations of the focal field are not co-located, dual polarized beams can be formed by combining the element responses in a beamformer. The capability of the PAF to optimize its beams in terms of sensitivity, sidelobes and polarization characteristics is demonstrated.
6 citations
08 Jun 1986
6 citations
13 Jul 1997
TL;DR: An on-board antenna for future S-band mobile satellite communications using hand-held terminals is studied, which consists of a large deployable mesh reflector and a primary feed using an active phased array that has the advantage of beam forming flexibility.
Abstract: Recently, engineers have focused on developing mobile satellite communications systems using GEO, MEO and LEO satellites. We are now studying an on-board antenna for future S-band mobile satellite communications using hand-held terminals. This antenna is carried on a GEO satellite, and consists of a large deployable mesh reflector and a primary feed using an active phased array. It has the advantage of beam forming flexibility. For example, when its radiation pattern changes due to an amplifier problem, we can obtain the desired pattern by adjusting the only excitation phase of the array feed. We first present the satellite antenna's configuration, then describe pattern correction by adjusting the excitation phase of the array feed.
6 citations
TL;DR: In this paper, a simple mathematical model for the vector radiation field from offset-parabolic reflector antennas is presented, which allows the primary feed to be offset from the reflector geometric focus, thus allowing the study of multiple-beam antennas.
Abstract: The development of a simple mathematical model for the vector radiation fields from offset-parabolic-reflector antennas is outlined. The model permits the primary feed to be offset from the reflector geometric focus, and thus allows the study of multiple-beam antennas. Predicted results are shown and correlated with measurements made on a 30 GHz antenna system.
6 citations
Patent•
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TL;DR: In this article, the authors propose to suppress degradation in characteristics by electromagnetic coupling between plurality of antennas and to cope with miniaturization of a housing even if a plurality of radio circuits operate simultaneously.
Abstract: To make it possible to suppress degradation in characteristics by electromagnetic coupling between plurality of antennas and to cope with miniaturization of a housing even if a plurality of radio circuits operate simultaneously. In a mobile radio apparatus in which a circuit board 102 , a first antenna 111 and a second antenna 112 are mounted in a housing 101 , a first radio section 121 and a second radio section 122 are mounted in the circuit board 102 and the first radio section 121 and the second radio section 122 can operate simultaneously, a reactance element 131 for influencing an operating frequency of the first radio section 121 or the second radio section 122 is disposed in at least one of the first antenna 111 and the second antenna 112 when an electric length of the circuit board 102 is configured to be shorter than one-fourth a wavelength of at least one of the operating frequencies of the first radio section 121 and the second radio section 122.
6 citations