Dual-polarized oblique beam waveguide slot array antenna

Abstract

The invention relates to a dual-polarized oblique beam waveguide slot array antenna. The dual-polarized oblique beam waveguide slot array antenna comprises more than one unit array antenna; the unit array antenna is formed by a horizontally polarized linear array and a vertically polarized linear array; the horizontally polarized linear array and the vertically polarized linear array are arranged in a horizontal staggered mode; the horizontally polarized linear array is arranged on the upper layer; the vertically polarized linear array is arranged on the lower layer; a horizontally polarized single ridge waveguide is provided with a broadside V-shaped radiation slot; a vertically polarized single ridge waveguide is provided with a broadside U-shaped radiation slot; a feed portion is in a ridge waveguide form and accordingly the integral bandwidth of the antenna is effectively guaranteed, the antenna achieves beam inclination, meanwhile the matching bandwidth of the antenna and the radiation efficiency are guaranteed. The integral antenna can achieve a good circular polarization axial ratio characteristic and meanwhile achieve a 45-degree fixed beam inclination angle due to appropriate phase compensation of a feed network. Compared with the waveguide slot antenna at the same frequency band, the dual-polarized oblique beam waveguide slot array antenna is small in size, low in profile and effectively reduces costs due to a bolt fastening installation mode.

Description

technical field [0001] The invention belongs to the technical field of panel antennas, and in particular relates to a dual-polarization oblique beam waveguide slot array antenna. Background technique [0002] Flat-panel antennas are widely used in mobile communication fields such as airborne, ship-borne, and vehicle-mounted. In order to meet the requirements of mobile carriers for wind resistance and the aesthetic requirements of vehicle appearance, low-profile and miniaturized flat-panel antennas are required. There are two types of low-profile planar antennas: full-waveguide structure and microstrip array. In the Ku-band, the efficiency of the full-waveguide structure is high, and the loss of the microstrip array antenna is large, especially when the input impedance of the array and patch is large (200Ω ), when the microstrip line is very narrow, the loss is greater and the manufacturing cost is high, so the microstrip array structure is not conducive to the adoption; the ...

AI Technical Summary

Problems solved by technology

There are two types of low-profile planar antennas: full-waveguide structure and microstrip array. In the Ku-band, the efficiency of the full-waveguide structure is high, and the loss of the microstrip array antenna is large, especially when the input impedance of the array and patch is large (200Ω ), when the microstrip line is very narrow, the loss is greater and the manufacturing cost is high, so the microstrip array structure is not conducive to the adoption; the signal on the geosynchronous satellite is mostly transmitted by linear polarization, which has both horizontal polarization and Vertical polarization, since the latitude and longitude of the satellite over the equator is generally different from the latitude and longitude of the receiving ground, the polarization direction will change after the horizontal or vertical polarized waves sent by the satellite reach the receiving ground, and the dual-polarized oblique beam antenna must realize polarization Tracking, the beam points of the two polarizations must be basically the same, so as to ensure that the received amplitudes of the two polarizations are basically the same, and polarization tracking can be realized through the back-end circuit

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