The AT-BPF-8186-12 from AT Microwave is a Waveguide Filter with Frequency 81 to 86 GHz, Insertion Loss -2.5 to -1.5 dB, Operating Temperature -40 to 85 Degree C, Rejection -40 dB, Rejection Frequency 60 to 105 GHz. Tags: Band Pass. More details for AT-BPF-8186-12 can be seen below.