Metasurface-based Gregory antenna

Abstract

The invention discloses a metasurface-based Gregory antenna, and mainly aims to solve the problems that the existing Gregory antenna is high in phase error, complex in structure, and long in focal length. The metasurface-based Gregory 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 above the focal point of the main reflecting mirror and has an ellipsoid characteristic phase, and is used for focusing the electromagnetic waves emitted by the feed source to a perifocus of the auxiliary reflecting mirror; the main reflecting mirror and the auxiliary reflecting mirror are connected throughthe supporting structure; and the perifocus of the auxiliary reflecting mirror coincides with the focal point of the main reflecting mirror, and the over focus coincides with the phase center of the feed source. By virtue of the metasurface-based Gregory antenna, the focal length of the Gregory 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 Gregorian 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 Gregorian antenna adds an ellipsoidal sub-reflector to the parabolic antenna. Electromagnetic waves are reflected by the sub-reflector and the main reflector to obtain a highly directional radiation pattern. It has been widely used in communications and radar. Compared with the ordinary ...

AI Technical Summary

Problems solved by technology

Such as the Chinese patent, the application publication number is CN 102496774A, the invention titled "a high-gain, low-sidelobe shaped double-bias Gregorian antenna design method", discloses a Gregorian antenna, through the optimization port The surface field distribution function is designed for the main and secondary reflectors. Although this antenna can achieve a radiation pattern with high gain and low sidelobes to a certain extent, it is difficult to process due to the special curved surface structure of the main and secondary reflectors. , the phase adjustment is difficult, the physical focal length cannot be adjusted, the antenna size is large, and the structure is complicated

Images