The AT-BPF-7681-12 from AT Microwave is a Waveguide Filter with Frequency 76 to 81 GHz, Insertion Loss -2.5 to -1 dB, Operating Temperature -40 to 85 Degree C, Rejection -40 dB, Rejection Frequency 60 to 90 GHz. Tags: Band Pass. More details for AT-BPF-7681-12 can be seen below.