Key Specifications. Waveguide Size 1 WR-75 Waveguide Size 2 WR-75 Frequency, Min 13.5 GHz Frequency, Max 15 GHz Lowband Min Rejection 40. Highpass Waveguide Filter With WR-75 Interface Operating from 13.5 GHz to 15 GHz. The PE-W75F002 is a WR-75 highpass filter with UG Cover Flanges. The pass band is 1000 MHz, or 13.5 to 15 GHz. Implementing a waveguide design, the filter has excellent rejection of 40 dB minimum at 9 GHz or about 4500 MHz from the band edge. It has a maximum insertion loss of 0.2 dB.