W-Band Ultra-Wideband Waveguide Filter

This article proposes a waveguide bandpass filter based on the W-band ultra-wideband technology. By inserting metal posts as capacitors in each resonant cavity of the direct coupling structure waveguide bandpass filter prototype, the filter achieves the objectives of ultra-wideband, low loss, and small size. By optimizing the metal post structural parameters and offset magnetic coupling coefficient based on the structural characteristics of the filter, the filter can achieve ultra-wideband frequency response and sharp high-pass edge. The final design result shows that the center frequency of the filter is 90 GHz, the relative bandwidth is approximately 44%, and the return loss in the passband is greater than 15 dB. This filter can be applied to W-band broadband systems.