Common face wave guide single-point feedback rear cavity round polarization antenna

Abstract

The invention relates to a cavity-backed circular polarization antenna for coplanar waveguide single-point feeding. The common cavity-backed circular polarization antenna has complicated structure, large volume, non-planar integration, as well as high cost. Two surfaces of a medium substrate of the invention are plated with metal layers, the upper metal layer is etched with a micro-strip line used for feeding, and a common ground and coplanar waveguide transmission line, and as the micro-strip line, the middle metal belt of the coplanar waveguide transmission line extends outwardly. The upper metal layer, the medium substrate, and the lower metal layer are opened with a plurality of metallized through holes arranged as a square, so as to form a cavity, and the coplanar waveguide transmission line dives into the cavity. The lower metal layer is etched with two mutually perpendicular long-shaped radiation slot in corresponding cavity area. Compared with the cavity-backed circular polarization antenna composed by prior metal cavity, the invention adopts common PCB process to manufacture, the manufacturing cost is low, and can realize seamless integration with the micro-strip circuit, thereby improving systemic integrated level.

Description

Technical field [0001] The present invention belongs to the field of microwave technology, and relates to a coplanar waveguide single-point-fed back cavity circularly polarized antenna based on substrate integrated waveguide technology, which can be used as an antenna for the radio frequency transceiver front end and is widely used in mobile communications, satellite communications, and radar Other wireless communication systems are used to solve the polarization mismatch problem caused by the Faraday electromagnetic rotation effect. At the same time, it can also suppress rain and fog interference and anti-multipath reflection. Background technique [0002] As a key component of the communication system, antennas are widely used in wireless communication applications. Due to the Faraday rotation effect of radio wave propagation in space and the uncertainty of the position of the receiving antenna in mobile communications, if a traditional single-polarized antenna is used as the t...

AI Technical Summary

Problems solved by technology

Compared with the previous cavity-backed circularly polarized antenna, this implementation method is greatly reduced in size, but its processing cost is still high, and it cannot be integrated in a plane; the helical antenna is mainly used in space applications of earth stations and satellite links. It has the advantages of high gain, low axial ratio, and wide axial ratio bandwidth, but its three-dimensional helical radiation structure determines its disadvantages such as large volume and incapable of plane integration.

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