A high performance 8-input, 8-output Butler matrix beamforming network for ultra-broadband applications
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A lightweight, 2-18 GHz, 8 /spl times/ 8 multilayered stripline Butler matrix which exhibited superb performance is presented. The Butler matrix's excellent performance is attributed to its high-performance hybrids and phase-shift networks. The novel design techniques for the hybrids and phase shift networks are described. >
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