Bandpass Filtering Power Divider With High Selectivity And Wide Stopband Based On Integrated Substrate Gap Waveguide

A bandpass filtering power divider (FPD) using integrated substrate gap waveguide (ISGW) technology is proposed, which has high selectivity and wide stopband. The filtering power divider includes three-layer substrates. The top layer substrate realizes a perfect magnetic conductor (PMC) using periodic plated vias and metallic patches. It is applied for packaging filter power divider composed of substrate integrated waveguide (SIW) and microstrip to avoid interference and losses induced by external radiation emission and internal radiation leakage. The middle layer substrate generates a gap layer. and the bottom layer substrate etch the slots on the metal plane and place a metal through hole in the middle of the metal layer to generate resonance and transmission zeros, and connect the microstrip to form a filter power divider circuit. The results show that FPD has multiple transmission zeros, the passband is 13.2 to 15.5 GHz, and an insertion loss of -4 dB. The return loss in the passband is less than -15 dB, and the isolation below is -16.5 dB.