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A compact broadband 8-way Butler matrix integrated with tunable phase shifters is proposed to provide full beam switching/steering capability. The newly designed multilayer stripline Butler matrix exhibits an average insertion loss of 1.1 dB with amplitude variation less than ??2.2 dB and an average phase imbalance of less than 20.7?? from 1.6 GHz to 2.8 GHz. The circuit size is only 160 ?? 100 mm...
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