The Design of a 220GHz High Frequency Selectivity Waveguide Bandpass Filter

In this paper, a WR-4.3 band waveguide bandpass filter (BPF) based on a singlet and an extracted pole resonator is presented. The singlet based on TE
₃₀₁
mode and extracted pole resonant cavities is developed to generate a transmission zero (TZ) on the lower side of the passband in order to achieve high selectivity. Furthermore, the TZ position can be controlled independently by changing the dimensions of resonant cavities. The simulation results show that the filter has a passband range of 212-220GHz and the return loss is better than 20dB. The lower stopband range is 200-210GHz and the suppression is more than 30dB. This high-performance filter is capable for improving the single sideband communication receiver.