An Unequal Filtering Power Divider Based on Integrated Substrate Gap Waveguide

In this paper, an ISGW filtering unequal power divider for millimeter wave band is proposed for the first time, which consists of an integrated substrate gap waveguide (ISGW) structure, an unequal power divider and a stepped impedance resonator. The unequal power distribution part uses a coupled line to achieve high output single-ended impedance, thereby achieving a high power division ratio of 6:1. The filtering part uses a combination of complementary split resonator rings and stepped impedance to achieve better broadband filtering performance. The simulation results show that the power divider has a relative bandwidth of 22.56%, four transmission zeros of 19.6GHz, 20.8GHz, 29.2GHz and 29.8GHz, and the power distribution ratio at the center frequency of 25GHz reaches 6:1.