Low-sidelobe high-gain polarization convertible resonant antenna

Abstract

The invention discloses a low-sidelobe high-gain polarization convertible resonant antenna, and belongs to the technical field of high-gain antennas. The antenna comprises a closed resonant cavity anda linear polarization feed source positioned in the closed resonant cavity, and the closed resonant cavity comprises a grounding plate, a partial reflection surface capable of realizing a polarization conversion function, and a metal electric wall and a metal magnetic wall which are arranged around the partial reflection surface and the grounding plate. According to the invention, a feed networkof a traditional high-gain circularly polarized antenna is omitted, and the structure is simpler; electromagnetic waves emitted by the linear polarization feed source realize linear-circular polarization conversion through the partial reflection surface, circularly polarized radiation of a caliber surface is formed; meanwhile, the metal electric walls parallel to the electric field direction is used for constraining the electric field emitted by the feed source; the electromagnetic field excited by the feed source is enabled not to generate leakage of an edge field on the four walls by using the constraint condition of the magnetic field by the magnetic walls parallel to the magnetic field direction, and more uniform field distribution is formed on the aperture surface so that the sidelobelevel of the antenna can be effectively reduced and the radiation characteristic can be improved.

Description

technical field [0001] The invention belongs to the technical field of high-gain antennas, and in particular relates to a high-gain polarization switchable resonant antenna with low sidelobe. Background technique [0002] Modern radar, satellite communication and other fields usually require the use of circularly polarized antennas with higher gain. A feed network is usually required to achieve the amplitude and phase conditions of circular polarization. On the other hand, in order to achieve higher gain, an array of elements is usually used, so the problem is that the feeding is complex and the mutual coupling between elements affects the performance of the antenna. Due to the leakage of the fringe field and the uneven distribution of the aperture field, the sidelobe of the antenna radiation pattern is high, which affects the actual use of this type of antenna. Contents of the invention [0003] Purpose of the invention: The purpose of the present invention is to provid...

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Problems solved by technology

[0003] Purpose of the invention: The purpose of the present invention is to provide a low-sidelobe high-gain polarization switchable resonant antenna, which solves the problem of complex feeding of existing high-gain circularly polarized antennas and the small aperture surface due to fringe fields. Problems with high sidelobes in the antenna radiation pattern due to leakage and uneven distribution of the aperture field

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