A spaceborne k-band phased array antenna circularly polarized waveguide radiation array

Abstract

The invention relates to a space-borne K-band phased array antenna circularly polarized waveguide radiation array, which can radiate microwave signals to space and can also receive microwave signals from space. The phased array antenna radiation array is composed of multiple antenna units, each of which includes a matching diaphragm, SMP coaxial feed socket, square waveguide radiator, wave conversion, SMP feed socket feed end, Impedance matching device and circular polarizer are adopted in an integrated design, and matching diaphragms are used between the antenna units to adjust the coupling characteristics between the radiating units to achieve more ideal standing wave performance and radiation characteristics. The structure of the antenna array is simple and reliable, and has the advantages of two-dimensional ±40° wide-angle scanning, low scanning gain drop, and excellent circular polarization characteristics. It meets the performance requirements of phased array antennas for space-borne inter-satellite and satellite-ground communications. The antenna itself adopts an aluminum structure, and factors such as atomic oxygen corrosion and ultraviolet radiation in the orbital space environment will not affect the performance of the antenna.

Description

technical field [0001] The invention belongs to the technical field of microwave antennas, in particular to a K-band phased array antenna circularly polarized waveguide radiation array, and its main application directions are inter-satellite, satellite-low communication and ranging. Background technique [0002] In the field of microwave antennas, the typical application of phased array radiation arrays is to radiate and collect microwave signals on active phased array antennas and passive antenna arrays. The main features are: signal radiation and collection, realization of circular polarization, support for beam scanning, etc. [0003] Accompanied by the urgent demand for inter-satellite, satellite-ground communication and ranging, and the rapid and agile beam change requirements of inter-satellite communication. The demand for spaceborne phased array antenna and its antenna radiation array technology is imminent. [0004] At present, there are many types of phased array...

AI Technical Summary

Problems solved by technology

[0004] At present, there are many types of phased array antenna radiation arrays, but none of them can meet the requirements of spaceborne. The main technical difficulties are as follows:

[0005] (1) The scanning angle of the existing phased array antenna radiation array is small, which cannot meet the requirements of inter-satellite and satellite-ground communication;

[0006] (2) The gain of the existing phased array antenna radiation array has a large drop at different scanning angles. When working at different scanning angles, the standing wave performance of the antenna unit is poor, and the performance cannot meet the link requirements of spaceborne communication and ranging;

[0007] (3) Most of the existing phased array antenna radiation arrays are linearly polarized, but for inter-satellite and satellite-ground communications, since the satellite attitude is not fixed, it is impossible to use linearly polarized signal communication, and circular polarization must be used for communication. Moreover, the radiation array is required to have good circular polarization characteristics within the working scanning range to reduce the polarization loss, so the existing phased array antenna radiation array cannot meet the requirements of satellite-borne inter-satellite and satellite-ground communication;

[0008] (4) The feeding method of the existing phased array antenna radiation array is cumbersome, and the radiator, impedance matcher, waveguide coaxial conversion and other structures are relatively complex, heavy, and require a lot of debugging, which cannot meet the requirements of spaceborne;

[0009] (5) The working frequency band of the existing phased array antenna radiation array is often in the L / S / X / C / KU band, and cannot work in the K band

Images