Design of 4 × 4 Filtering Butler Matrix Combined 90° and 180° Couplers

Y. B. Liu(Foshan University), Xian‐Hui He(Foshan University), Qiang Shao(Foshan University), Rui‐Sen Chen(Foshan University), Guan‐Long Huang(Foshan University), Zi‐Long Feng(Foshan University), Mustafa K. Taher Al‐Nuaimi(Foshan University), Ning Yang(Foshan University), Yimin Lu(Guangxi University)
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