Frequency-adjustable Butler matrix

Abstract

The invention relates to a frequency-adjustable Butler matrix, which comprises a metal copper-clad upper layer, a dielectric layer, a metal copper-clad lower layer which are sequentially laminated from top to bottom. The frequency-adjustable Butler matrix is characterized in that the metal copper-clad upper layer comprises four groups of frequency-adjustable directional couplers distributed in four directions, two groups of broadband phase shifters distributed in two directions diagonally and two groups of connecting wires. The first group of frequency-adjustable directional coupler is respectively and sequentially in series connection with the first group of broadband phase shifter, the second group of frequency-adjustable directional coupler, the first group of connecting wire, the third group of frequency-adjustable directional coupler, the second group of broadband phase shifter, the fourth group of frequency-adjustable directional coupler and the second group of connecting wire according to the clockwise direction to form a closed loop. The frequency-adjustable Butler matrix has the advantages that the scheme of the frequency-adjustable Butler matrix adopts the frequency-adjustable directional couplers to replace fixed-frequency directional couplers used in a traditional Butler matrix, and the Butler matrix has frequency adjustable capacity.

Description

technical field [0001] The invention belongs to the technical field of microwave passive devices, in particular to Butler matrices in microwave passive devices. Background technique [0002] Software defined radio and its upgraded concept cognitive radio are popular technologies in the field of mobile communication in recent years. Utilizing such non-techniques can manage spectrum resources flexibly and effectively, greatly improve spectrum utilization, and reduce mutual interference between systems with operating frequencies close to each other. Software radios and cognitive radios require their hardware systems to be reconfigurable, that is, to change the operating characteristics of circuits by means of electricity or other incentives. [0003] On the other hand, the rapid development of mobile communication has made traditional multiple access methods, such as CDMA, FDMA, TDMA, etc., unable to meet the growing needs of capacity expansion. The multi-beam antenna generat...

AI Technical Summary

Problems solved by technology

The traditional 4×4 Butler matrix is ​​composed of four directional couplers and phase shifters. Once the design is completed, its operating frequency is fixed and cannot be changed; its operating bandwidth is limited by the operating bandwidth of the directional coupler, which is generally narrow and difficult to Meet the requirements of wireless systems covering multiple radio frequencies

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