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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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Proceedings ArticleDOI
01 Nov 2006
TL;DR: This work presents a new concept (patent pending) where a shaped reflector reduces both the number of feeds per beam and theNumber of reflectors to one (with separate receive and transmit antennas) and the price paid is an oversizing of the reflector making thereflector area comparable to the total area of the conventional four-reflector solution.
Abstract: Current Ka-band multibeam satellite antenna systems often use one feed per beam, but involve a high number of reflector antennas (four for transmit and four for receive) to realise both acceptable crossover levels and spillover losses (Rao, 1999). Several developments go on to reduce the number of reflectors to one for transmit and one for receive at the cost of much complexity in the feed array and beamforming. Orthogonal efforts aim at developing antennas that both receive and transmit. Here we present a new concept (patent pending) where a shaped reflector reduces both the number of feeds per beam and the number of reflectors to one (with separate receive and transmit antennas). The price paid is an oversizing of the reflector making the reflector area comparable to the total area of the conventional four-reflector solution.

22 citations

Patent
11 Jun 1999
TL;DR: In this article, a shape ring focus type subreflector is employed for air-to-ground link hemispherical communication coverage, which is rotationally symmetric about the boresight axis of a feed horn to which communication equipment on board an unmanned aerial vehicle is coupled.
Abstract: An antenna, such as may be employed for air-to-ground link hemispherical communication coverage, comprises a shaped ring focus type subreflector, that is rotationally symmetric about the boresight axis of a feed horn to which communication equipment on board an unmanned aerial vehicle is coupled. There is no main reflector associated with the shaped subreflector, so that rays from the subreflector, which emanate in a generally hemispherical pattern, are not intercepted. The generally hemispherical radiation pattern extends toward the horizon and encompasses a ground station. The subreflector is preferably shaped such that the hemispherical radiation pattern has a peak gain profile that extends from a first prescribed elevation differential slightly above the horizon to a second prescribed elevation differential slightly below the horizon. Although the feed horn causes a partial blockage of rays reflected by the shaped subreflector directly beneath the antenna, reduction in nadir gain is quite tolerable in a UAV application, as it lasts for only a fraction of second when the UAV platform passes directly over the ground station, where range-based propagation loss is minimum. Also, as the principal theater of deployment of a UAV is geographically remote from the ground station, nadir-associated gain reduction is not a practical problem.

21 citations

Patent
30 Sep 1998
TL;DR: In this paper, a multiband, shaped ring focus antenna architecture employs only a single or common main reflector, that is shaped such that it can be shared by each of a pair of interchangeable, diversely shaped close proximity-coupled, subreflector-feed pairs designed for operation at respectively different spectral bands.
Abstract: A multiband, shaped ring focus antenna architecture employs only a single or common main reflector, that is shaped such that it can be shared by each of a pair of interchangeable, diversely shaped close proximity-coupled, subreflector-feed pairs designed for operation at respectively different spectral bands. The operational band of the antenna is changed by swapping out the subreflector-feed pairs. Placement of the shaped subreflector in close proximity to the feed horn reduces the diameter of the main shaped reflector relative to a conventional ring focus structure, so as to facilitate installation within a constrained space facility, such as a shipboard-mounted satellite communication system.

21 citations

Patent
11 Oct 1979
TL;DR: In this paper, a number of different forms of suitable frequency dependent reflectors are described, employing composite arrangements frequency selective mesh or grid reflector elements, or arrays of reflecting horns or wedges.
Abstract: A reflector antenna comprising a reflector system, and a feed system, for instance a log-periodic feed system, the phase center of which moves with frequency, for illuminating the reflector system to produce a substantially focussed antenna beam. To compensate for frequency variations in the position of the phase-center of the feed system, the reflector system includes a frequency dependent reflector the effective surface of reflection of which varies with frequency to cause the focus of the reflector system to move with the phase-center of the feed system. A number of different forms of suitable frequency dependent reflectors are described, employing composite arrangements frequency selective mesh or grid reflector elements, or arrays of reflecting horns or wedges.

21 citations

Journal ArticleDOI
TL;DR: In this paper, the edge-diffraction theory is applied to compute the H -plane pattern of a pyramidal horn and a back-lobe pattern obtained by using finite current elements is also given.
Abstract: Edge-diffraction theory is applied to compute the H - plane pattern of a pyramidal horn. Diffracted rays from E edges of the aperture are shown contributing to back-lobe radiation. A back-lobe pattern obtained by using finite current elements is also given. The computed results agree well with measurements.

21 citations


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