Dual-frequency dual-polarization Fabry-Perot resonant cavity antenna

Abstract

The invention discloses a dual-frequency dual-polarization Fabry-Perot resonant cavity antenna. The antenna comprises an upper dielectric substrate, a middle dielectric substrate and a lower dielectric substrate (2, 4 and 7) which are fixed into a whole through low-dielectric-constant nylon columns (10). The upper surface of the upper-layer dielectric substrate is provided with an upper partial reflection surface (1), and the upper-layer dielectric substrate and the partial upper reflection surface form an upper-layer partial reflection surface structure; a middle partial reflection surface (3) and a lower partial reflection surface (5) are respectively arranged above and below the middle dielectric substrate, and the middle partial reflection surface, the lower partial reflection surface and the middle dielectric substrate form a lower-layer partial reflection surface structure; and the bottom dielectric substrate comprises two layers of dielectric plates (71 and 72), a parasitic patch (8) is arranged between the two layers, a metal floor (6) is arranged on the lower surface of the first-layer dielectric plate, a parasitic rectangular patch array (9) is arranged on the upper surface of the second-layer dielectric plate, and the two dielectric plates, the parasitic patch, the metal floor and the parasitic rectangular patch array form a feed source structure. According to the invention, linear polarization and circular polarization can be realized at the same time, channel capacity is improved, signal attenuation is reduced, and the antenna can be used for astronomical detection and satellite communication systems.

Description

technical field [0001] The invention belongs to the technical field of antennas, in particular to a Fabry-Perot resonant cavity antenna, which can be used for astronomical exploration and satellite communication. Background technique [0002] The Fabry-Perot resonant cavity was first produced in 1897 and was jointly invented by Frenchmen Charles Fabry and Alfred Perot. The Fabry-Perot resonant cavity antenna loads a frequency selective surface above the traditional microstrip antenna, and uses the microstrip feed source and the frequency selective surface to form a cavity, so that the energy of the feed source oscillates multiple times in the cavity, and finally all radiates out of the cavity. The high-gain performance of the Fabry-Perot resonant cavity antenna makes it of great application value in the fields of astronomical exploration and satellite communication, and has always been an important research direction for microwave and antenna scholars. [0003] The dual-fre...

AI Technical Summary

Problems solved by technology

For the currently existing dual-frequency dual circularly polarized Fabry-Perot resonant cavity antennas, most of them adopt dual-frequency line-polarized feeds and frequency-selective surfaces with dual-frequency dual circularly polarized characteristics, but for this type of antenna, there are frequency selection The surface unit structure is relatively complex, the operating frequency cannot be adjusted independently, and the polarization form is single.

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