The AT-BPF-191200-04 from AT Microwave is a Waveguide Filter with Frequency 191 to 200 GHz, Insertion Loss -3 to -1.8 dB, Operating Temperature -40 to 85 Degree C, Rejection -40 dB, Rejection Frequency 140 to 260 GHz. Tags: Band Pass. More details for AT-BPF-191200-04 can be seen below.