A Window Grille Butler Matrix and Its Design Method

Abstract

The invention relates to a grille-type Butler matrix and a design method thereof. Two 3dB directional couplers are connected through a short-circuit arm; each 3dB directional coupler is connected to an outer conductor through a short-circuit arm. Due to the use of the short-circuit arm, the amplitude and frequency within the band present equal ripple characteristics, and the insertion loss fluctuation performance is more superior; in addition, a tuning screw is loaded to achieve the best standing wave, amplitude-frequency and phase characteristics of the product. Since the Butler matrix has equi-ripple characteristics, it is suitable for broadband design. The loading of the short-circuit arm is equivalent to increasing the order of the directional coupler, which can effectively expand the working bandwidth. The Butler matrix of the present invention is low cost, easy to process and easy to assemble. All the corners of the inner and outer conductors of the structure are rounded, and the milling process can be used, which is convenient for processing and low in cost. The loading of the short-circuit arm makes the inner and outer conductors integrated, which completely eliminates the relative sliding between the inner and outer conductors and helps to improve the consistency of batch products.

Description

technical field [0001] The invention relates to a grille-type Butler matrix and a design method thereof, belonging to the field of microwave passive technology. Background technique [0002] High-throughput communication satellites (HTS, High Throughput Satellite), also known as high-throughput communication satellites, are relative to traditional satellites that use the same frequency resources. The main technical features include multi-spot beams, frequency multiplexing, and high beam gain. Wait. HTS can provide a capacity that is several times or even dozens of times higher than that of conventional communication satellites. With the gradual maturity of high-throughput payloads and the continuous acceleration of the research and development process of new communication satellite platforms, the demand for HTS satellites continues to increase. [0003] The passive multi-beam network based on the Butler matrix is ​​the core component of the HTS satellite, which is used to r...

AI Technical Summary

Problems solved by technology

The inner and outer conductors of the traditional square coaxial Butler matrix are separated, which requires a medium for support and positioning. In the process of assembly and joint welding, it is likely to cause inaccurate positioning and relative sliding of the inner and outer conductors. In addition, although the traditional method The coaxial Butler matrix can expand the bandwidth by increasing the order. Since its in-band is not equal to the ripple characteristic, the amplitude-frequency performance will deteriorate with the increase of the bandwidth. From this aspect, it is not suitable for broadband Butler matrix. Le matrix product

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