59 results about "Cassegrain antenna" patented technology

Disclosed is a Cassegrain-type antenna. The Cassegrain-type antenna may comprise a main-reflector; a sub-reflector; and a radiator radiating beams by using a plurality of emitters. Also, a reflective surface of the sub-reflector has a shape of a trace formed by rotating a first curve having a vertex and being convex toward the main-reflector around a rotation axis spaced apart from the vertex.

A mechanically scanned reflector antenna system that produces a compact swept diameter and overall height, which is ideally suited for use on the external surface of a high speed mobile platform where a low profile, lightweight antenna is needed. The antenna system includes a main reflector and a subreflector both formed from composite materials. A support assembly includes a pair of arms that cantilever the main reflector forwardly of a base portion of the support assembly such that a portion of the main reflector can be positioned below an upper surface of the base portion. This enables the vertical height of the swept arc of the main reflector to be reduced when the main reflector is rotated about its elevation axis. The assembly provides an even more compact system that can be enclosed within a smaller radome when the system is employed on an external surface of a high speed mobile platform.

The invention relates to a dual-band wave beam equalization side-fed offset cassegrain antenna and a realization method thereof. The antenna comprises four pairs of standard side-fed offset cassegrain antennas and each pair of antenna comprises a primary reflector, a secondary reflector and a feed source assembly, wherein the four pairs of the standard side-fed offset cassegrain antennas are in a standard form and are used for receiving and transmitting; each feed source assembly is formed by a plurality of sample strip forming light wall loudspeaker feed sources; each sample strip forming light wall loudspeaker feed source is formed by sequentially connecting a sample strip forming light wall loudspeaker, a square and circle transition, a circular polarizer, a square and square transition and an orthogonal mould coupler; a main lobe of a low-frequency emission directional diagram and a first lateral lobe of a high-frequency receiving directional diagram irradiate the reflectors; and a phase center of each feed source assembly is located on focus planes of the reflectors and points at the center of an equivalent reflection face. According to the dual-band wave beam equalization side-fed offset cassegrain antenna and the realization method thereof disclosed by the invention, an antenna receiving-transmitting directional diagram has the equal beam width; and the dual-band wave beam equalization side-fed offset cassegrain antenna has the advantages of simple structure, portability, easiness for designing, good performance, strong practical applicability and the like, and has the good same frequency interference resistance.