Double-frequency broadband circular polarization grating based on single-layer dielectric

Abstract

The invention belongs to the field of satellite communication and provides a double-frequency broadband circular polarization grating based on single-layer dielectric; on the premise that a low-profile single-layer dielectric structure is guaranteed, the problem that an existing double-frequency circular polarization grating is high in insertion loss and narrow in bandwidth is solved. According tothe unit structure of the circular polarization grating, a horizontal I-shaped dipole and a half I-shaped dipole of the cross-shaped structure provide low-frequency resonance and high-frequency respectively; and the size of the horizontal I-shaped dipole and the size of the half I-shaped dipole are adjusted, so as to realize the adjustment of the circularly polarized grating low-frequency pass band and the high-frequency pass band and the double-frequency iso-circularly polarized emergent wave; and in addition, a vertical I-shaped dipole of the cross-shaped structure further optimizes the working frequency band, so that the insertion loss at the two central frequency points of 18.55 GHz and 28.54 GHz are only 1.1dB and 0.8dB respectively, the axial ratio bandwidths can reach 24% and 11% respectively, and the K / Ka satellite communication working frequency bands can be completely covered.

Description

technical field [0001] The invention belongs to the field of satellite communication, and relates to a novel dual-frequency broadband circular polarization grid, specifically a dual-frequency broadband circular polarization grid based on a single-layer medium, which is especially suitable for dual frequency satellite communication system. Background technique [0002] With the continuous development of satellite communication systems, multi-band broadband circularly polarized antennas are particularly important. Especially in the K / Ka satellite communication system, the working bandwidth of the circularly polarized antenna is required to cover two frequency bands of 17.7-20.2GHz and 27-30GHz, and different polarization working modes are shown in each frequency band. [0003] At present, there are mainly two ways to implement circularly polarized antennas: the first is to change the feed network of the antenna, and to generate two kinds of linear poles whose polarizations ar...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a dual-frequency broadband circular polarization grid based on a single-layer dielectric, which solves the problems of large insertion loss and narrow bandwidth of a dual-frequency circular polarization grid reported in the prior art under the premise of ensuring a low-profile single-layer dielectric structure. question

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