Parallel Coupling Bandpass Filtering Power Divider Based on Integrated Substrate Gap Waveguide

A parallel coupled bandpass filter power divider (FPD) based on integrated substrate gap waveguide (ISGW) is designed. The overall circuit of the FPD is cascaded by T-type power divider and parallel coupled resonant filter circuit. The parallel circuit design is convenient to adjust the filter characteristics and power characteristics of FPD. The results show that its center frequency is 26.5GHz and its passband is 26.1GHz to 27.1GHz, with good out-of-band suppression on both sides of the passband. The return loss in the passband is less than -25dB, there are 2 transmission zero on the right side, the insertion loss is -1.2dB, and the isolation less than -21dB.