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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TL;DR: In this paper, a dual-band coaxial hybrid-mode feed horn with partial dielectric loading for reflector antennas has been numerically and experimentally investigated, which provides larger band separation and rather good electrical performances over a wide frequency range (20% and more) within each operational frequency band.
Abstract: Copolar and crosspolar radiation as well as matching characteristics of a novel dual-band coaxial hybrid-mode feed horn with partial dielectric loading [1] for reflector antennas have been numerically and experimentally investigated. In comparison with dual-band corrugated horns this horn has higher crosspolar level, but provides larger band separation and rather good electrical performances over a wide frequency range (20% and more) within each operational frequency band. Furthermore, the main concept of the coaxial feed system can be easily extended for multi-band cost-effective applications in reflector antennas with polarization diversity.
8 citations
TL;DR: In this article, the cross-polarization properties of multi-phase-center parabolic reflector antennas, illuminated by over-moded primary feeds, have been investigated and a simple array technique with a simple signal processing is used for the symmetric case, whereas a trimode primary feed is employed for the offset case.
Abstract: This letter addresses the cross-polarization properties of electronically controlled multi-phase-center parabolic reflector antennas, illuminated by over-moded primary feeds. Due to the presence of the higher-order modes in the primary feed, the secondary cross-polarization levels deteriorate in the case of symmetric reflector antennas. As for the offset reflectors, the primary multimode feed required to displace the phase-center location may produce a significant crosstalk in the orthogonal polarization. It is shown how one can improve the cross-polarization performances of aforementioned adaptive antennas, which are capable of providing axial beams while their phase-center locations are displaced. The conventional array technique with a simple signal processing is used for the symmetric case, whereas a trimode primary feed is employed for the offset case.
8 citations
27 Jul 2015
TL;DR: In this paper, the authors presented the fabrication and experimental validation results of compact size high gain conical horn lens antenna for E-band (71-86GHz) applications, and very promising measured results were obtained in terms of return loss |S 11 |, gain, aperture efficiency, bandwidth and SLL as will be shown in this article.
Abstract: This article presents the fabrication and experimental validation results of compact size high gain conical horn lens antenna for E-band (71–86GHz) applications. Very promising measured results are obtained in terms of return loss |S 11 |, gain, aperture efficiency, bandwidth and SLL as will be shown in this article. A peak measured gain of 25.8dB, gain improvement 6.5∼8.8dB over the gain of the horn without lens, maximum aperture efficiency of 48.8%, SLL 11 |<−10dB for 70–110GHz band.
8 citations
Patent•
29 Mar 2011
TL;DR: In this paper, an apparatus for direction-finding a received radio signal is described, which consists of two or three antennas, including one or two loop antennas that work in conjunction with a third reference antenna, such as a dipole, monopole or helical antenna.
Abstract: An apparatus for direction-finding a received radio signal is disclosed. The receiving apparatus selectively receives on a predetermined frequency to match the transmitter frequency. The receiving apparatus comprises of two or three antennas, including one or two loop antennas that work in conjunction with a third reference antenna (whose phase does not vary when its orientation changes relative to the transmitter), such as a dipole, monopole or helical antenna. By comparing the phase between the antennas the direction of the incoming RF signal can be determined. In some embodiments, the windings of the two loop antennas are wound in reverse with respect to each other in order to substantially double the sensitivity of the signal-detection capabilities.
8 citations
01 Oct 2003
TL;DR: In this paper, a leaky-wave retrodirective reflector using short and matched terminations is presented, which consists of terminating a backfire-to-end-fire leaky wave antenna by a short load at one end and by and matched load at the other end.
Abstract: A novel leaky-wave retrodirective reflector using short and matched terminations is presented. The principle of this reflector consists of terminating a backfire-to-endfire leaky-wave antenna by a short load at one end and by and matched load at the other end. In this manner, the incident field excites the antenna, is reflected by the short, and is reradiated toward the source, while it is absorbed by the matched load at the other end, avoiding a spurious beam a the "wrong" side of the normal to the antenna. While using a conventional antenna would lead a reflector working only in a 90 degrees space, using the recently developed backfire-to-endfire leaky wave antenna allows 180 degrees reflector operation.
8 citations