Butler Matrix Phase Weighting Optimization Method and Butler Matrix

Abstract

The invention discloses a Butler matrix phase weighting optimization method and a Butler matrix capable of realizing the method. The method is based on an n×n order Butler matrix, where n=2 N , N is a positive integer, including: setting an adjustable phase shifter at each input port; after n input signals respectively pass through the corresponding input port and the corresponding adjustable phase shifter, N-level vector synthesis is performed, and Output n output beams from n output ports; obtain the theoretical value and actual value of the phase difference between the two input signals for vector synthesis in each stage of vector synthesis for any output beam, and then obtain two The phase difference error value between two input signals; according to the phase difference error value, the adjustment amount required by each adjustable phase shifter is calculated and adjusted. According to the phase weighting optimization method of the Butler matrix of the present invention, the phase deviation of the Butler matrix can be reduced, and the beam forming performance of the Butler matrix can be improved.

Description

technical field [0001] The invention relates to the technical field of microwave communication, in particular to a phase weighting optimization method of a Butler matrix and a Butler matrix capable of realizing the method. Background technique [0002] Butler matrix is ​​a kind of equal-amplitude phase weighting network, which is used for multi-beam synthesis. Different phase weighting is realized by 3dB orthogonal branch line coupler (or 180° ring coupler) and several fixed and adjustable phase shifters, forming Multiple beams in different directions. The Butler matrix method is used to realize multi-beams, and each beam utilizes all the radiation elements of the entire front, so it is a lossless multi-beam synthesis method for phased array beam synthesis. The multiple beams formed by the ideal Butler matrix have orthogonality, the peak value of each beam coincides with the zero value of other beams, and the mutual interference between the beams is minimal. [0003] Howev...

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Problems solved by technology

[0003] However, for the existing Butler matrix, various errors in the processing and manufacturing process can easily lead to amplitude and phase deviations, which in turn affect the key technical indicators of the phased array, such as beam pointing, maximum side lobe, integral side lobe, Beam isolation, anti-interference ability, etc.

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