The AT-BPF-6671-12 from AT Microwave is a Waveguide Filter with Frequency 66 to 71 GHz, Insertion Loss -2 to -1 dB, Operating Temperature -40 to 85 Degree C, Rejection -40 dB, Rejection Frequency 50 to 90 GHz. Tags: Band Pass. More details for AT-BPF-6671-12 can be seen below.