Progress In Electromagnetics Research
ISSN: 1070-4698, E-ISSN: 1559-8985
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By J. He, B.-Z. Wang, Q.-Q. He, Y.-X. Xing, and Z.-L. Yin

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This paper presents the design of a wideband X-band microstrip 4×4Butler matrix. The wideband performance of the Butler matrix means that it possesses equal coupling and difference of phases throughout the operating band. Design of the wideband components such as 3-branch branch line hybrid, crossover and Schiffman line phase shifter are presented in this paper. A final design of the Butler matrix is proposed. The Butler matrix exhibits couplings and phase errors within −6.7 ± 0.7 dB and 10 over a 20% bandwidth with a center frequency at 10 GHz.

J. He, B.-Z. Wang, Q.-Q. He, Y.-X. Xing, and Z.-L. Yin, "Wideband x-band microstrip butler matrix," Progress In Electromagnetics Research, Vol. 74, 131-140, 2007.

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