A Dual-frequency Broadband Circular Polarization Grating Based on Single-Layer Dielectric

Abstract

The invention belongs to the field of satellite communication, and provides a dual-frequency broadband circular polarization grid based on a single-layer medium. On the premise of ensuring a low-profile single-layer dielectric structure, it solves the problems of large insertion loss and wide bandwidth of the dual-frequency circular polarization grid reported in the existing reports. narrow question. In the unit structure of the circular polarization grid of the present invention, the horizontal "I" type dipole and the half "I" type dipole of the cross-shaped structure provide low frequency and high frequency resonance respectively; by adjusting the horizontal "I" type dipole The size of the pole and half "I" type dipole realizes the adjustment of the low frequency passband and high frequency passband of the circular polarization grid and the dual frequency different circularly polarized outgoing waves; and, the vertical "I" type of the cross structure The dipole further optimizes the working frequency band, achieving the insertion loss of only 1.1 and 0.8dB at the two center frequency points of 18.55 and 28.54GHz, respectively, and the effect of axial ratio bandwidth as high as 24% and 11%, completely covering the K / Ka satellite Communication working frequency band.

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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