Topic
Cassegrain antenna
About: Cassegrain antenna is a research topic. Over the lifetime, 3207 publications have been published within this topic receiving 28278 citations.
Papers published on a yearly basis
Papers
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18 Aug 1989
TL;DR: In this paper, a parabolic-type reflector antenna for radar was proposed, where the horizontal and vertical axes and the axis XX' of the reflector pass through the centre of phase 21 of the primary source, which centre is coincident with the focus of the reflectionor, in such a way that the system is constantly focused.
Abstract: The invention relates to a reflector antenna for radar. This antenna includes a fixed primary source 2 and a parabolic-type reflector 1 which is movable in rotation around a vertical axis GG' for pointing in azimuth, and around a horizontal axis SS' for pointing in elevation. The horizontal and vertical axes and the axis XX' of the reflector pass through the centre of phase 21 of the primary source, which centre is coincident with the focus of the reflector, in such a way that the system is constantly focused. The invention applies especially to very high power radiation with very short pulses.
8 citations
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30 Jul 2014
TL;DR: In this article, the authors proposed a box-shaped fan-beam antenna, which consists of a feed horn, a main cylindrical reflector, an auxiliary cylindric reflector and an upper cover plate.
Abstract: The invention provides a box-shaped fan-beam antenna. The box-shaped fan-bean antenna comprises a feed horn, a main cylindrical reflector, an auxiliary cylindrical reflector, an upper cover plate, a lower cover plate, a left baffle and a right baffle. The Cassegrain antenna geometric form is adopted in a bus of the main cylindrical reflector and a bus of the auxiliary cylindrical reflector, the upper side of the main cylindrical reflector, the lower side of the main cylindrical reflector, the left side of the main cylindrical reflector, the right side of the main cylindrical reflector, the upper side of the auxiliary cylindrical reflector, the lower side of the auxiliary cylindrical reflector, the left side of the auxiliary cylindrical reflector and the right side of the auxiliary cylindrical reflector form a box-shaped cavity through the upper cover plate, the lower cover plate, the left baffle and the right baffle respectively, the horn conducting feed on the box-shaped cavity is hidden inside the box-shaped cavity and a waveguide port in the rear portion of the horn serves as a feed port. The box-shaped fan-beam antenna can provide fan beams with a wide pitch (azimuth) range and a narrow azimuth (pitch) range, and is simple in structural form, easy to process and manufacture and very suitable for being applied to millimeter-wave and over-submillimeter-wave frequency bands.
8 citations
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12 Feb 1988TL;DR: In this article, a planar reflector which is controllable between a reflective condition and a transmissive condition is placed parallel to a second planar reflective reflector, and a pulse of electromagnetic energy is injected into the space between the reflectors.
Abstract: A compact electromagnetic antenna pattern range includes a planar reflector which is controllable between a reflective condition and a transmissive condition. The controllable reflector is placed parallel to a second planar reflector, and a pulse of electromagnetic energy is injected into the space between the reflectors, propagating toward one of the reflectors. After a number of re-reflections, the controllable reflector is rendered transmissive and a substantially planar wavefront is made available for application to the antenna under test.
8 citations
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TL;DR: In this article, a method for optimising the feed position of a prime focus reflector antenna from phase and amplitude recordings of the radiated field is given, and the improved radiation pattern and detailed profile map of the reflector attained after feed position correction.
Abstract: A method for optimising the feed position of a prime focus reflector antenna from phase and amplitude recordings of the radiated field is given. Experimental results illustrate the improved radiation pattern and the detailed profile map of the reflector attained after feed position correction.
8 citations
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08 Apr 2013
TL;DR: In this article, a 300 GHz radar imaging system is described, including descriptions of the radar sensor and antenna subsystems, and a prototype is being mounted and its characterization is presented.
Abstract: A 300 GHz radar imaging system is presented, including descriptions of the radar sensor and antenna subsystems. The antenna consists of a Bifocal Ellipsoidal Gregorian Reflector whose beam is scanned by a combination of the rotation and vertical tilting of a flat small secondary mirror. A prototype is being mounted and its characterization will be presented.
8 citations