Circularly polarized waveguide slot antenna

Abstract

The invention discloses a circularly polarized waveguide slot antenna which comprises a rectangular waveguide, a spherical resonant cavity is arranged at the top end of the rectangular waveguide in a centering mode, and the spherical resonant cavity and the rectangular waveguide are connected through a coupling structure; the top end of the spherical resonant cavity is provided with a first gap and a second gap, the first gap and the second gap vertically intersect in a cross shape, and the intersection point is located in the center of the top of the spherical resonant cavity; the first coaxial feed connector and the second coaxial feed connector are both arranged on the rectangular waveguide and adopt same-phase excitation; the rectangular waveguide is used for exciting two microwave modes with orthogonal phases; an electromagnetic signal forms two microwave modes with orthogonal phases after passing through the rectangular waveguide, and the two microwave modes with orthogonal phases cut surface current in a gap of the spherical resonant cavity after passing through the coupling structure, so that electromagnetic waves radiate circularly polarized waves outwards, and the circularly polarized purity is high; and the spherical resonant cavity is large in volume-to-surface area ratio and high in quality factor, and the efficiency of the antenna in the working bandwidth is high.

Description

technical field [0001] The invention belongs to the technical field of antennas, in particular to a circularly polarized waveguide slot antenna. Background technique [0002] The antenna is a key component of the wireless communication system, which plays the role of energy conversion between the guided electromagnetic wave and the radiated electromagnetic wave; compared with the linearly polarized antenna, the circularly polarized antenna has the functions of resisting rain and fog attenuation, suppressing multipath interference signals and relaxing reception and communication. The outstanding advantage of the limitation of the installation orientation of the transmitting antenna. [0003] The waveguide slot antenna is to make regular slits on the metal surface of the waveguide, and the slot cuts the surface current to radiate the electromagnetic energy in the waveguide, and performs interference superposition in the far field, and radiates electromagnetic energy in a speci...

AI Technical Summary

Problems solved by technology

[0006] Aiming at the technical problems existing in the prior art, the present invention provides a circularly polarized waveguide slot antenna to solve the technical problems of the existing waveguide slot antenna, low circular polarization purity and low antenna efficiency

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