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A 4 Chi 4 millimeterwave-frequency Butler matrix in grounded co-planar waveguide technology for compact integration with 5G antenna arrays

This article presents a novel 4 Chi 4 Butler matrix implemented in the grounded co-planar waveguide (GCPW) technology, compactly integrated with a highly efficient and broadband 1 Chi 4 air-filled substrate integrated waveguide (AFSIW) cavity-backed …