Broadband Planar Fully Integrated 8 x 8 Butler Matrix Using Coupled-Line Directional Couplers

作者：Wincza Krzysztof^*; Gruszczynski Slawomir; Sachse Krzysztof

来源：IEEE Transactions on Microwave Theory and Techniques, 2011, 59(10): 2441-2446.

DOI：10.1109/TMTT.2011.2164092

• Butler matrices
• coupled-line directional couplers
• differential phase shifters
• transmission-line crossovers

An innovative approach that allows for realization of broadband planar fully integrated 8 x 8 Butler matrices is presented. Coupled-line directional couplers have been utilized, which enable broad operational band. A novel arrangement of the network has been proposed that allows the creation of an entirely planar design having two metallization layers and no interconnections between these layers. Four selected crossovers have been realized as a tandem connection of two 3-dB/90 degrees coupled-line directional couplers, which, together with reference lines having appropriate electrical lengths, perform simultaneously crossovers of signal lines, and all needed broadband constant value phase shifters. Moreover, two of the needed 3-dB/90 degrees directional couplers have been designed as tandem connections of two 8.34-dB directional couplers, acting as 3-dB/90 degrees directional couplers having crossed outputs. With such a modification, a fully planar design with no inter-layer connections is possible. The proposed network arrangement has been experimentally tested with the design of an 8 x 8 Butler matrix operating at the center frequency of 3 GHz. The obtained measurement results fully confirm the validity of the proposed approach.

• 出版日期2011-10