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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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TL;DR: In this paper, the design method of and experimental results obtained from a wide-band satellite antenna with a multifrequency primary horn is described, which can be used in 4, 6, 20, and 30 GHz frequency bands.
Abstract: The design method of and experimental results obtained from a wide-band satellite antenna with a multifrequency primary horn is described. This antenna can be used in 4, 6, 20, and 30 GHz frequency bands. Some measured data of the primary horn and the antenna are reported. Consequently, the antenna efficiency is about 45-50 percent in all the above frequency bands.
10 citations
TL;DR: In this paper, a direct-machined terahertz corrugated horn with good beam characteristics and low cross-polarization was designed for a possible future ALMA band 11 (1.25-1.57 GHz) receiver.
Abstract: High-performance dual-polarization receiver optics is a key component of terahertz applications with stringent requirements, such as radio astronomy or planetary exploration. Usually, such optics use corrugated horns due to their excellent wideband performance. However, this kind of horns is difficult to fabricate for frequencies higher than 1 THz. Traditionally, the performance of optics at frequencies over 1 THz is thus limited by the choice of feed horn, usually a diagonal or smooth-wall horn. This choice limits the effective maximum aperture efficiency or bandwidth achievable, respectively. Recently, we successfully fabricated direct-machined terahertz corrugated horns with good beam characteristics and low cross polarization. Based on these horns, we have designed full receiver optics for a possible future ALMA band 11 (1.25–1.57 THz) receiver. The polarization separation is achieved by means of a wire grid. A prototype has been fabricated and tested on a near-field beam scanner. It shows aperture efficiency above 85% and polarization efficiency above 99.6% at all measured frequencies. This complies with the stringent requirements of the ALMA telescope for frequencies between 35 and 950 GHz. To our knowledge, these are the highest aperture and polarization efficiencies achieved over such a wide bandwidth at around 1.4 THz.
10 citations
Patent•
02 Nov 1992TL;DR: In this paper, a transmitter/receiver system is provided wherein a transmitter of such system produces a transmitted signal frequency modulated in accordance with the level of a modulating signal and a receiving antenna has an output thereof coupled to a receiver through a switch means, for coupling or inhibiting signals received by the receiving antenna from passing to the receiver selectively.
Abstract: A transmitter/receiver system is provided wherein a transmitter of such system produces a transmitted signal frequency modulated in accordance with the level of a modulating signal and a receiving antenna has an output thereof coupled to a receiver through a switch means, for coupling or inhibiting signals received by the receiving antenna from passing to the receiver selectively in accordance with the level of the modulating signal.
10 citations
Patent•
19 Jul 1991
TL;DR: In this article, a parabolic low wind load antenna for receiving incoming MMDS signals is proposed, where the antenna is essentially constructed of two identically formed, one-piece reflective halves connected together to form a rectangular shaped parabolic antenna.
Abstract: A parabolic low wind load antenna for receiving incoming MMDS signals wherein the antenna is essentially constructed of two identically formed, one-piece reflective halves connected together to form a rectangular shaped parabolic antenna. Each of the reflector halves comprises a substantially U-shaped rigid frame being parabolically shaped in the length dimension and being parabolically shaped in the width dimension. A plurality of reflector elements of circular cross-section and of equal length are oriented in parallel relationship to each other and are spaced apart from each other at a predetermined spacing of about ten percent of the MMDS wavelength. The predetermined spacing is determined in a plane perpendicular to the path of the incoming signals and each of the reflected elements is connected at its terminal ends to the sides of the U-shaped frame. Each of the reflector elements is formed in a full parabolic shape in the width dimension. Connectors are formed on the ends of the sides of the U-shaped frame for providing connection to the other identical reflector half. Near the center of the U-shaped frame is an additional structural parallel support for supporting the center of the linear reflector elements. These supports also terminate in connectors to which the feed of the antenna is connected and supported. All of the structural elements including the reflector elements are of a circular cross-section.
10 citations
TL;DR: In this article, a scanning dual-offered reflector antenna using the simple motion of a flat subreflector to illuminate different parts of a shaped main reflector is presented, and a particular case having a 20-degree linear field-of-view (for a DBS application) with a 30/spl lambda/ aperture diameter is explored.
Abstract: A scanning dual-offset reflector antenna using the simple motion of a flat subreflector to illuminate different parts of a shaped main reflector is presented. A particular case having a 20-degree linear field-of-view (for a DBS application) with a 30/spl lambda/ aperture diameter is explored. The main reflector surface is shaped to minimize the phase aberrations across the field-of-view. Once the main reflector surface is designed, the subreflector parameters are determined to ensure optimum focusing across the field-of-view. >
10 citations