Topic
Cassegrain antenna
About: Cassegrain antenna is a research topic. Over the lifetime, 3207 publications have been published within this topic receiving 28278 citations.
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Patent•
22 Mar 1996
TL;DR: In this article, an antenna system which is capable of producing multiple, high-gain, independently steerable antenna beams from a single antenna aperture is described, in part by utilizing a separate phased array antenna as the feed element of a spherical lens for each desired beam.
Abstract: The invention relates to an antenna system which is capable of producing multiple, high-gain, independently steerable antenna beams from a single antenna aperture. The system accomplishes this, in part, by utilizing a separate phased array antenna as the feed element of a spherical lens for each desired beam. In this fashion, the beam(s) produced by the antenna system can each be electronically steered (independently of the other beams, if any) and physical movement of the feed element(s) is not required. The invention may also use multiple spherical lenses, wherein each lens includes at least one phased array feed.
28 citations
Patent•
02 Apr 1976TL;DR: In this article, an antenna assembly wherein the direction of a beam of radio frequency energy may be changed by combining the effects of a mechanically movable reflector and an electromagnetic lens is disclosed.
Abstract: An antenna assembly wherein the direction of a beam of radio frequency energy may be changed by combining the effects of a mechanically movable reflector and an electromagnetic lens is disclosed. In the preferred embodiment the antenna arrangement includes a corporate monopulse feed arranged to produce a linearly polarized divergent beam which is first reflected from a linearly polarized paraboloid to direct a convergent beam toward a mechanically rotatable polarization-twisting reflector. A selected portion of a spherical electromagnetic lens arrangement is illuminated by the still convergent beam from the latter reflector, such lens then determining the direction of the beam finally propagated in free space. The relative positions of the corporate monopulse feed, the linearly polarized paraboloid, the mechanically rotatable polarization-twisting reflector and the characteristics of the spherical electromagnetic lens arrangement are selected so that, for a given antenna assembly for electromagnetic energy of a given frequency, the linearly polarized divergent beam from the corporate monopulse feed is converted to a substantially collimated beam in free space.
28 citations
15 Apr 1991
TL;DR: The authors present aspects of the design and performance of a reconfigurable mesh reflector antenna, and the first demonstration of electrically controlled reconfiguration is illustrated.
Abstract: The authors present aspects of the design and performance of a reconfigurable mesh reflector antenna, and the first demonstration of electrically controlled reconfiguration is illustrated. These aspects include the influence of boundary constraints on performance when compared to a rigid shaped reflector and the repeatability of practical configurations. The first topic is explored theoretically, while the second involves an experimental study made using an 85 cm diameter mesh reflector antenna.<
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27 citations
TL;DR: In this article, the effect of the width and length of the reflecting surfaces on the width of the main lobe and the level of the radiation to the rear is summarized in a series of curves.
Abstract: Radiation patterns were measured for corner-reflector antennas having various combinations of widths and lengths of the reflecting surfaces. The widths of these ranged from 1 to 10 wavelengths, the lengths from 0.5 to 5 wavelengths. The aperture angle was, in general, set at a value required to maximize the gain. Radiation patterns are arranged according to the size of the reflecting surfaces. The effect of the widths and lengths of the surfaces on the widths of the main lobe and on the level of the radiation to the rear is summarized in a series of curves. A corner-reflector antenna with a collinear array of dipoles was designed, constructed, and tested to have sidelobe radiation below -40-db level.
27 citations
TL;DR: The suitability of various radiating systems for generating a directive high-power microwave (HPM) beam is considered in this article, where offset reflector antenna systems are well suited for this purpose.
Abstract: The suitability of various radiating systems for generating a directive high-power microwave (HPM) beam is considered. It is concluded that offset reflector antenna systems are well suited for this purpose. An HPM reflector antenna may consist of one or two reflectors that are illuminated by single or array feeds. To accurately predict the performance of an HPM reflector antenna, a versatile analysis scheme is used to compute the fields of an array feed with general configurations, and the diffraction techniques of physical optics (PO) and physical theory of diffraction (PTD) are applied to analyze reflectors of conic or shaped surfaces. Design examples of offset dual-reflector antennas for HPM applications are presented. Analysis results are shown with emphasis on both the near-field and far-field radiation characteristics. Applications of optimization (mathematical programming) techniques to the diffraction synthesis of HPM reflector antenna systems are discussed, and examples are given to demonstrate their effectiveness. >
27 citations