59 results about "Cassegrain antenna" patented technology

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.

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.

The invention provides a three-reflector compact field antenna measuring system. The three-reflector compact field antenna measuring system comprises a feed source, a primary reflector, a first shaping secondary reflector and a second shaping secondary reflector, wherein electromagnetic waves sent by the feed source are reflected to the second shaping secondary reflector through the first shaping secondary reflector, the electromagnetic waves are reflected to the primary reflector through the second shaping secondary reflector, the electromagnetic waves reflected by the primary reflector outgo as plane electromagnetic waves, and a system outgoing field is generated; the first shaping secondary reflector and the second shaping secondary reflector form a Cassegrain antenna structure, and the second shaping secondary reflector and the primary reflector form a Gregory antenna structure. According to the three-reflector compact field antenna measuring system, the Cassegrain-Gregory three-reflector structure is adopted to design the compact field antenna measuring system, a high primary reflector caliber using rate can be achieved, good silent area performance is kept, and manufacturing cost is lowered.

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 multimode substrate integrated waveguide monopulse antenna which can be directly applied to microwave and millimeter wave tracking systems, detection systems, communicationsystems, measurement systems, astronomy observing systems and the like and can serve as a feed source of a parabolic reflector antenna and a cassegrain antenna. An upper layer metal copper-clad surface (1) and a lower layer metal copper-clad surface (2) of the antenna are respectively arranged on the front side and the reverse side of a medium substrate (3); a plated-though-hole (4) is connected with the upper layer metal copper-clad surface (1) and the lower layer metal copper-clad surface (2) after passing through the medium substrate (3) to form a substrate integrated waveguide 3dB directional coupler (5), a substrate integrated waveguide 90-degree phase shifter (6), a substrate integrated waveguide wave mode device (7) and a master wave guide (8) which are arranged in sequence, i.e. the output end of the former component is connected with the input end of the latter component; the substrate integrated waveguide 3dB directional coupler (5) is respectively connected with a first input port (101) and a second input port (102), and the output end of the main wave guide (8) is connected with the input end of a horn antenna (9).

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.

The invention discloses a Cassegrain monopulse antenna based on a planar array structure, which belongs to the technical field of antennas. The antenna comprises a feed source, a main reflecting surface, an auxiliary reflecting surface, a supporting structure and a sum-difference network. A main reflecting surface of the antenna is a groove-shaped main reflecting surface formed by a plurality of array surfaces, each array surface is formed by a passive unit array, and the shape of each unit is two square rings which are concentrically arranged. The required phase distribution can be realized by adjusting the size parameters of each unit on the array plane, and the design freedom degree and flexibility are improved. The Cassegrain monopulse antenna has the advantages of being high in gain, small in size, easy to machine and the like. Meanwhile, compared with a Cassegrain antenna with a main reflecting surface formed by a single array surface, the aperture efficiency of the antenna is improved.