High-gain large-angle scanning cross antenna

Abstract

The invention discloses a high-gain large-angle scanning crisscross antenna, which comprises a parasitic metal sheet, a dielectric supporting piece, a crisscross oscillator and a feed coaxial part, wherein the parasitic metal sheet is located at the top of the high-gain large-angle scanning crossed antenna and is used for improving impedance matching of the antenna during large-angle scanning; thedielectric supporting piece is arranged between the parasitic metal sheet and the feed coaxial part and is used for supporting the parasitic metal sheet; the cross oscillator is positioned in the middle of the high-gain large-angle scanning cross antenna and is coaxially connected with the feed; the feed coaxial part is located at the bottom of the high-gain large-angle scanning cross antenna. The antenna works in the frequency band of 1.2 GHz to 1.6 GHz, and impedance matching during large-angle scanning of the antenna is improved while the gain of the antenna unit is greatly improved. According to the antenna provided by the invention, the scanning range of the antenna is improved to + / -70 degrees, the maximum standing wave of the two polarization ports is less than 2 when the antenna scans 70 degrees, and the unit gain can be greater than 8dBi in a working frequency band.

Description

technical field [0001] The invention relates to the technical field of antennas, in particular to a high-gain, large-angle scanning cross antenna. Background technique [0002] Common unit forms in the microwave frequency band include waveguide slot antennas, open waveguide radiators, orthogonal tapered slot antennas, multi-layer microstrip patch antennas with multi-point feed, and cross antennas. The waveguide slot antenna has narrow bandwidth, small scanning angle, poor scanning performance at large angles, and heavy weight in engineering applications. Open-ended waveguide radiators are suitable for S-band and above. When used in low frequencies, the size and weight are too large, and the debugging method of wide-angle matching is not flexible enough. Usually, multi-layer dielectric coverage is required. The advantage of the orthogonal tapered slot antenna is that it has a wide bandwidth, which can realize ultra-wideband and wide-angle scanning. The disadvantage is that t...

AI Technical Summary

Problems solved by technology

The advantage of the orthogonal tapered slot antenna is that it has a wide bandwidth, which can realize ultra-wideband and wide-angle scanning. The disadvantage is that the unit structure is complex and the structure is required to be continuous in telecommunications. Otherwise, the resonant mode will be excited in the working frequency band and the in-band of the antenna will be deteriorated. Standing wave performance, so there are great difficulties in engineering design

The multi-layer microstrip patch antenna with multi-point feed has the disadvantages of complex processing technology and high cost, so it is rarely used in radar systems

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