Low-profile two-dimensional Fresnel zone plate antenna based on planar aperture space feed

Abstract

The invention discloses a low-profile two-dimensional Fresnel zone plate antenna based on planar aperture space feed. A planar aperture feed source carries out close-range space feed on a two-dimensional Fresnel zone plate; the planar aperture feed source and the Fresnel zone plate have the same size and are fixedly connected in an insulating manner; the planar aperture feed source comprises a planar aperture antenna and a power division network which are combined or separated independently, and the planar aperture antenna adopts an antenna structure of a planar patch antenna array or a planarslot / opening array; a power division network feeds the planar aperture antenna to generate emergent electromagnetic waves; the emergent electromagnetic waves vertically enter the two-dimensional Fresnel zone plate; and the power division network enables the phases of the emergent electromagnetic waves to be in central outward gradient distribution on the surface of the two-dimensional Fresnel zone plate by regulating and controlling the phase shift function. According to the invention, generalized Fresnel diffraction patterns are formed on the Fresnel zone plate by adopting feed sources withdifferent plane calibers, and two-dimensional beam scanning of the Fresnel zone plate antenna is realized by utilizing the phase shift capability of the phase reconfigurable Fresnel zone plate.

Description

technical field [0001] The invention belongs to the field of two-dimensional beam scanning Fresnel zone plate antennas, in particular to a low-profile two-dimensional Fresnel zone plate antenna based on plane aperture space feeding. Background technique [0002] The traditional Fresnel zone plate antenna consists of a Fresnel zone plate and a spherical wave space feed represented by a horn antenna. According to Huygens' principle, the radiation far field is obtained by the coherent superposition of the radiation field at each point of the Fresnel zone plate as the secondary emission source. The different paths of the spherical wave incident on each point of the Fresnel zone plate lead to the different phases of the secondary emission sources. Among all the paths where the outgoing wave of the secondary transmitting source reaches the far-field beam, the shortest path is used as the reference path, and the phase at its position is used as the reference phase. The difference...

AI Technical Summary

Problems solved by technology

If it is placed too far away, the phase difference on the Fresnel zone plate cannot satisfy the Fresnel diffraction pattern that forms a specific beam pointing, and increases the antenna profile

[0003] Considering comprehensively, the traditional Fresnel zone plate antenna has the following main problems: 1. The formation of Fresnel diffraction patterns is limited by the incidence of spherical waves

2. It is difficult to determine the optimal placement distance of the feed; 3. Loss caused by oblique incidence

4. High antenna profile;

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