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, which relates to the technical field of millimeter-wave antennas. The present invention is realized through the following technical solutions: the antenna radiation patch is connected to the rectangular parasitic patch with a high-impedance matching microstrip line with a cross carved in the center to perform impedance matching on the antenna, and the diagonal bisector at the corner of the antenna radiation patch On the center of symmetry, a pinwheel-shaped microstrip radiation patch is fabricated to excite the degenerate mode of equal-amplitude in-phase polarization and orthogonality. The feeding probe passes through the antenna dielectric layer and connects the antenna radiation patch through four rectangular parasitic patches. Each Antenna unit four feed probes 4 through the same amplitude sequentially with a difference of 90 ° The rotating feeding structure is used for feeding, and the windmill-shaped microstrip radiation patch is connected to the four rectangular parasitic patch rectangular blocks of the four metallized probes for feeding, and the feeding phases are respectively 90 degrees apart. ° The equal-amplitude excitation forms circularly polarized radiation, and the antenna array is arranged in a rectangular array with equal spacing between units to form an antenna array front.

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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