The AT-LPF-74-12 from AT Microwave is a Waveguide Filter with Frequency 55 to 74 GHz, Insertion Loss -2.5 to -1 dB, Operating Temperature -40 to 85 Degree C, Rejection -40 to -30 dB, Rejection Frequency 77 to 100 GHz. Tags: Low Pass. More details for AT-LPF-74-12 can be seen below.