Two-dimensional circularly-polarized wide-angle scanning phased-array antenna

Abstract

The invention discloses a two-dimensional millimeter wave circularly-polarized wide-angle scanning phased-array antenna, and relates to the technical field of millimeter wave antennas. According to the technical scheme, an antenna radiation patch is connected with a rectangular parasitic patch through a high impedance matching microstrip line which is provided with a cross-carved equal length in the center and is used for carrying out impedance matching on the antenna, and a windmill-shaped microstrip radiation patch excitation equal-amplitude in-phase polarization orthogonal degenerate mode is manufactured on the symmetric center of a diagonal bisector of the corner of the antenna radiation patch; feed probes penetrate through the antenna dielectric layer and are connected with the antenna radiation patch through the four rectangular parasitic patches, the four feed probes 4 of each antenna unit feed through rotary feed structures which are equal in amplitude and sequentially differ by 90 degrees, and the windmill-shaped microstrip radiation patch is connected with rectangular blocks of the four rectangular parasitic patches of the four metallized probes for feed. feeding in equal-amplitude excitation with the phase difference of 90 degrees is performed in sequence to form circular polarization radiation, and the antenna arrays are arranged in a rectangular manner at equal intervals according to unit intervals to form an antenna array surface.

Description

technical field [0001] The invention belongs to the technical field of microwave antennas, in particular to a two-dimensional millimeter-wave circularly polarized wide-angle scanning antenna array. Background technique [0002] With the development of modern aerospace technology, the requirements for various radar phased array antennas are increasing. Compared with the traditional mechanical scanning radar system, the phased array antenna has more convenient beam control, more sensitive and convenient beam response, and can realize high-speed and high-performance beam scanning and beam tracking. At the same time, the phased array antenna has the advantages of light weight, low profile and small installed volume, so it has received more and more attention. However, the planar phased array antenna is severely limited by the narrow beam scanning range. As the antenna array scanning angle increases in the elevation plane, the antenna scanning gain will decrease severely, and ef...

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Problems solved by technology

Although this patent application has achieved circular polarization scanning, the scanning angle has not been well expanded, and the scanning area is not continuous. ° Azimuth presentation of

In addition, the circularly polarized phased array demonstrated by this scheme has a narrow operating bandwidth and the axial ratio performance of the scanning beam is not ideal

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