Window grille type Butler matrix and design method thereof

Abstract

The invention relates to a window grille type Butler matrix and a design method thereof. 3dB directional couplers are connected in pairs through a short-circuit arm; and each 3dB directional coupler is connected with an outer conductor through a short-circuit arm. Due to the use of the short-circuit arms, the in-band amplitude and frequency present the equal ripple characteristic, and the insertion loss fluctuation performance is more excellent. In addition, the loading of a turning screw can realize the optimal standing wave, amplitude, frequency and phase characteristics. The Butler matrix has the equal ripple characteristic, thereby being suitable for broadband design. The loading of the short-circuit arm is equivalently increases the order of the directional coupler, thereby being capable of effectively expanding the working bandwidth. The Butler matrix is low in cost, easy to machine and easy to assemble. All corners of the inner conductor and the outer conductor of the structure are round corners, and only the milling process is adopted, thereby being convenient to process and low in cost. The loading of the short-circuit arm enables the inner conductor and the outer conductor to be integrated, thereby completely eradicating the relative sliding between the inner conductor and the outer conductor, and being conducive to improving 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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