Millimeter-Wave Balanced Filtering Crossover Using Multi-layered SIW Cavity

In this paper, a novel millimeter-wave balanced filtering crossover is proposed by using a multi-layered substrate-integrated waveguide (SIW) cavity. To take full advantages of the E-field distributions of TE202 and TE104 modes in SIW rectangular cavity, the cross-differential-mode (DM) transmission, good isolation of the dual-channel, and common-mode (CM) suppression can be attained at the same time. In addition, in order to realize dual-mode filtering DM response, two SIW cavities are mutual-coupled in stacked form. To validate the design concept, a prototype SIW-balanced filtering crossover operating at 53.63 GHz and 59.26 GHz is designed and simulated, and the simulation results show good characteristics.