A wideband half-mode substrate integrated waveguide (HMSIW) 3-dB filtering coupler is presented. The defected ground structures (DGS) and Bethe holes are etched on HMSIW simultaneously to generate a ...

Abstract: In this paper, a miniaturized wideband 90° coupler is proposed. Without defected ground planes and a multilayer process, a wider bandwidth and compact size are obtained by using shorted ...