Metallized through-hole infinitesimal disturbance based low profile back-cavity circularly polarized antenna

Abstract

The invention relates to a lowly-outlined cavity-backed circularly polarized antenna based on the disturbance of plated-through hole. The existing cavity-backed circularly polarized antenna can not be planar integrated has a complex structure, a large size, and a high cost. In the invention, a metal layer is plated at two faces of a dielectric substrate; an upper metal layer is etched with a micro-strip line used for feeding and a coplanar waveguide transmission line; a middle metal strip of the coplanar waveguide transmission line extends outwards as a micro-strip line. A plurality of plated-through holes are installed by penetrating the upper metal layer, the dielectric substrate and a lower metal layer forming a round cavity into which the coplanar waveguide transmission line extends. Two strips of vertical rectangular slots are etched at the region on the lower metal layer of the corresponding cavity. Two perturbation plated-through holes are installed by penetrating the whole dielectric substrate at the two ends of the central line of one of the two slots. Compared with the existing cavity-backed circularly polarized antenna formed by the metal cavity, the cavity adopted by the invention is manufactured by the common PCB technology with a low manufacturing cost, and the invention can be seamlessly integrated with a micro-strip circuit, thus increasing the integrity of the system.

Description

technical field [0001] The invention belongs to the field of microwave technology, and relates to a low-profile cavity-backed circularly polarized antenna based on metallized through-hole perturbation based on substrate integrated waveguide technology. Communication, radar and other wireless communication systems are used to solve the polarization mismatch problem caused by the Faraday electromagnetic rotation effect, and can also play a role in suppressing rain and fog interference and anti-multipath reflection. Background technique [0002] As a key component of a communication system, antennas are widely used in wireless communication occasions. Due to the Faraday rotation effect of radio wave propagation in space and the uncertainty of the position of the receiving antenna in mobile communication, if a traditional single-polarized antenna is used as the transceiver unit, the polarization matching alignment of the transceiver antenna is required to achieve better receptio...

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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