Phased-array antenna subarray for circularly polarized wide-angle scanning

Abstract

The invention provides a phased-array antenna subarray for circularly polarized wide-angle scanning, and aims at providing a phased-array antenna subarray which has a good wide-angle scanning gain characteristic and a good wide-angle scanning circular polarization characteristic, and can avoid derotation properly. The phased-array antenna subarray is achieved by the technical scheme as follows: three circularly polarized microstrip antenna radiation patches are distributed on a microstrip antenna dielectric plate (10) in a ternary rotary inversion subarray form; a metal layer (6) at the lower part of the microstrip antenna dielectric plate serves as a metal place for three microstrip antenna units; each coaxial joint inner core (3) and each coaxial joint outer core (4) form a coaxial feeding port; each coaxial outer core is connected with the metal place; each coaxial joint inner core is connected with the corresponding radiation patch located in the microstrip antenna dielectric plate in blind-inserting and non-contact manners; and the coaxial feeding ports perform electromagnetic coupling feeding and implement phase compensation on the microstrip antenna units to obtain a subarray radiating left-hand circular polarization electromagnetic waves or a subarray radiating right-hand circular polarization electromagnetic waves.

Description

technical field [0001] The invention relates to a phased array antenna sub-array suitable for circular polarization wide-angle scanning by a phased array antenna. Background technique [0002] Nowadays, airborne array antennas have gradually transitioned from the earliest fixed-beam mechanical scanning array antennas to phased array antennas, and phased array antennas are divided into passive phased array antennas and active phased array antennas. The requirements of modern advanced combat aircraft platforms for airborne antennas mainly include: try to be consistent with the shape of the fuselage, and appear in the form of a low profile, so as not to destroy the original aerodynamic characteristics of the combat aircraft and obtain better radar low detectability; Reduce weight and reduce the burden of combat aircraft take-off weight. [0003] At the same time, in some applications of airborne antennas, phased array antennas are required to perform circularly polarized wide-...

AI Technical Summary

Problems solved by technology

The traditional mechanical scanning array antenna with a fixed beam has a complex structure, heavy weight, and requires a servo system, which makes the scanning speed too slow, which is not in line with the design ideas of today's aircraft.

[0004] The prior art uses circularly polarized units as phased array antenna array units, and the array arrangement often adopts some regular forms, such as matrix arrangement. In the scanning area of ​​the angle, the gain reduction and axial ratio deterioration of the phased array antenna are very serious

In addition, at this time, the phased array antenna will also have serious anti-rotation problems.

[0005] In the prior art, in order to implement the protection of the antenna, the radome, which is unfavorable to the aerodynamic characteristics of the aircraft and the low detectability of the radar, is installed at the installation position of the airborne antenna

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