A spaceborne SAR dual-polarized microstrip radiating sub-array antenna

Abstract

Aiming at the antenna polarization requirement of the multi-information spaceborne SAR imaging system, the invention adopts a rational unit layout combination, and uses the metallized through hole to isolate the mutual coupling problem between the two polarization energies of the subarray, thereby solving the spaceborne active source The shortcomings of phased array radiation sub-array cross-polarization difference and poor port isolation, while fully considering the space environment adaptability and reliability of the radiation sub-array, and paying full attention to material selection and processing, processing selection, structural design and layout, etc. The array has the advantage of large-scale engineering application.

Description

technical field [0001] The invention belongs to the technical field of microwave antennas, and in particular relates to a spaceborne SAR antenna and a manufacturing method thereof. Background technique [0002] Synthetic Aperture Radar (SAR) detection based on spaceborne platform has become an important means of military reconnaissance, land mapping, earthquake relief and disaster relief. Compared with optical radar, SAR has the advantage of all-weather all-weather. With the continuous development of application requirements, it becomes more urgent for SAR to have the ability to collect multi-polarization information, and the SAR antenna is an RF front-end system that collects polarization information and plays an important role. The radiation sub-array is the basic unit of the conventional SAR antenna, and its performance directly determines the imaging quality of the SAR system. Conventional radiation sub-arrays often use two forms: waveguide radiation sub-array and micro...

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Problems solved by technology

[0003] There are many designs and studies on dual-polarized microstrip antennas at home and abroad, and its theory is relatively mature. It has been studied and analyzed in detail from the aspects of unit selection, linear array and area array design, and low cross-polarization. A 1× Three types of dual-polarized microstrip sub-arrays in the form of 8-unit double-slit coupling feeding and two types of 1×16-unit hybrid feeding. Its thickness is relatively large, and the design of the radio frequency interface is complex, which is not suitable for mass engineering applications, and the feeder between the two polarizations does not adopt corresponding isolation measures, and the feeder has its own radiation effect, resulting in cross-polarization and The isolation has not reached the optimal design. The design of the radiation sub-array uses foam as the supporting material between the layers of the microstrip antenna. Therefore, there is still a certain gap in the design and research of spaceborne dual-polarized microstrip antennas for engineering applications.

[0004] The currently operating SAR satellites using microstrip radiation sub-arrays are the COSMO satellite developed by Italy and the ALOS satellite developed by Japan respectively, but there is little information about their radiation sub-arrays, and the specific engineering design and preparation scheme cannot be verified. Authorized utility model patent for microstrip patch antenna, a single-polarized antenna for communication applications, which focuses on the antenna design itself, with fewer claims on performance and implementation

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