A V-band Wideband Waveguide Filters with Inductive Iris

A multi-resonator rectangular waveguide band-pass filter (BPF) loaded with inductive diaphragms is presented in this paper, which operates in the passband of 60-65GHz. The presented BPF is equipped with low rectangle coefficient. By loading more diaphragms, resulting in an increased number of resonators, the presented BPF is characterized by high out-of-band rejection. The width of the diaphragm window is adjusted to reduce insertion loss and length of cavity between diaphragms is mainly adjusted for determining the central frequency. Simulation results show that the BPF with central frequency of 62.5GHz has highest return loss of -9.1dB and maximum insertion loss of 0.9dB, over the whole passband. Additionally, compared to other waveguide BPFs, the presented BPF is designed with low 20-dB rectangle coefficient of 1.13, which means that the presented BPF can provide a highly selective response. The measured result is basically consistent with the simulation result, which shows that the maximum insertion loss is 2.3dB at 60GHz and the highest return loss is -10.26dB at 65GHz.