Circular polarizer with switchable polarization

Abstract

The present invention relates to the technical field of microwave antennas and discloses a circular polarizer with switchable polarization. The circular polarizer comprises an upper structure and a lower structure. According to the lower structure, metal grids are formed by arranging a plurality of metal lines with gaps, the metal grids are printed on dielectric plates, and the dielectric plates are bonded to foam layers. According to the upper structure, metal meander line structures are formed by arranging multiple metal meander lines with gaps, the metal meander line structures are printedon three layers of dielectric plates, and the three dielectric plates and two foam layers are bonded to each other. Both the upper structure and the lower structure are coaxial disk structures, and the upper structure can rotate around an axis relative to the lower structure. By rotating the structure of the polarizer, the arbitrary conversion of a linearly polarized wave to left and right circularly polarized waves is achieved, or the polarization form of an original electromagnetic wave is not changed. In addition, according to the design of the two-layer structure, the interaction between the antenna structure and meander line circular polarizer is eliminated, the shaft ratio performance of an antenna is improved, and the polarization conversion efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of microwave antennas, in particular to a polarizer switchable from linearly polarized waves to left-handed circularly polarized waves. Background technique [0002] Polarization is an important feature of electromagnetic waves. For satellite communications, a smooth link not only requires the beam of the ground antenna to be aligned with the satellite, but also requires the polarization of the ground antenna to match the polarization of the satellite beam. The polarization of the electromagnetic wave is determined by the trajectory traveled by the end of the electric field vector along the propagation direction of the electromagnetic wave. When the trajectory of the end of the electric field vector is a straight line, a circle, or an ellipse, the corresponding polarization states are linear polarization, circular polarization, and Elliptical polarization. According to the different handedness of the trajec...

AI Technical Summary

Problems solved by technology

[0011] To sum up: the problems existing in the existing circular polarizer technology are: the radiation polarization form is single, and the polarization cannot be switched freely; the application environment of the polarizer design is single, and it cannot meet the needs of various planar antennas

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