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Metasurface-based cassegrain antenna

A Cassegrain antenna and metasurface technology, applied in the field of Cassegrain antennas, can solve the problems of inability to adjust the physical focal length, large feeder loss, and large antenna size, and achieve a simple structure, reduced antenna height, and low cost. Effect

Active Publication Date: 2018-11-13
XIDIAN UNIV
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Problems solved by technology

However, because the main reflector still adopts the traditional paraboloid, the physical focal length cannot be adjusted, the size of the antenna is large, and the feed source is placed at the real focus of the secondary reflector, the feeder loss is large and the structure is complex

Method used

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Embodiment Construction

[0034] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0035] refer to figure 1 , the present invention includes a carrier 1 , a primary reflector 2 , a secondary reflector 3 , a feed source 4 and a supporting structure 5 . The carrier 1 is located at the bottom of the overall structure of the antenna, the main reflector 2 is conformally inlaid on the upper surface of the carrier 1, and the sub-reflector 3 is located directly above the main reflector 2 and the feed source 4. Mirror 2 is connected. The carrier 1 adopts a concave structure, and the main reflector 2 conforms to the carrier 1. The center of the conformal structure is hollowed out, and the feed source 4 is installed in the hollowed out position. The feed source 4 adopts a pyramidal horn antenna and is divided into a waveguide part and an angle part. The waveguide part is a standard WR51 waveguide.

[0036] The numerical quantificatio...

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Abstract

The invention discloses a metasurface-based cassegrain antenna, and mainly aims to solve the problems that the existing cassegrain antenna is high in phase error, complex in structure, and long in focal length. The metasurface-based cassegrain antenna comprises a carrier (1), a main reflecting mirror (2), an auxiliary reflecting mirror (3), a feed source (4) and a supporting structure (5); the carrier adopts a convex structure; the main reflecting mirror is conformal with the carrier; each of the main reflecting mirror and the auxiliary reflecting mirror adopts a phase change metasurface structure established based on generalized Snell law, wherein the auxiliary reflecting mirror is located below the focal point of the main reflecting mirror and has a hyperbolic characteristic phase, and is used for dispersing the electromagnetic waves emitted by the feed source into spherical waves; the main reflecting mirror and the auxiliary reflecting mirror are connected through the supporting structure; and the virtual focal point of the auxiliary reflecting mirror coincides with the focal point of the main reflecting mirror, and the solid focal point coincides with the phase center of the feed source. By virtue of the metasurface-based cassegrain antenna, the focal length of the cassegrain antenna can be shortened, wave beam calibration can be realized; and meanwhile, the antenna phase compensation error is lowered, the structure is simple, and the antenna can be used for communication and radar.

Description

technical field [0001] The invention belongs to the technical field of antennas, and in particular relates to a Cassegrain antenna, which can be used as a transmitting and receiving antenna for communication and radar. technical background [0002] Microwave antennas are mainly divided into end-fire, slot, reflector antennas and other types, among which the reflector antenna has the characteristics of high gain performance. The microwave reflector antenna is mainly a parabolic antenna, which uses the collimation effect of the parabolic reflector to convert the spherical wavefront emitted from the feed source at the focal point into an outgoing plane wavefront to form a high-gain pattern. The Cassegrain antenna adds a hyperboloid secondary reflector to the parabolic antenna. Electromagnetic waves are reflected by the secondary reflector and the main reflector to obtain a highly directional radiation pattern. It has been widely used in communications and radar. Compared with ...

Claims

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Application Information

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IPC IPC(8): H01Q13/02H01Q15/00H01Q15/14H01Q15/16H01Q19/19
CPCH01Q13/02H01Q15/0086H01Q15/14H01Q15/16H01Q19/19
Inventor 杨锐高东兴高鸣李冬张澳芳李佳成
Owner XIDIAN UNIV
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