The AT-BPF-215225-04 from AT Microwave is a Waveguide Filter with Frequency 215 to 225 GHz, Insertion Loss -2.5 to -1 dB, Operating Temperature -40 to 85 Degree C, Rejection -30 to -15 dB, Rejection Frequency 205 to 235 GHz. Tags: Band Pass. More details for AT-BPF-215225-04 can be seen below.