The AT-LPF-70-12 from AT Microwave is a Waveguide Filter with Frequency 50 to 70 GHz, Insertion Loss -2.5 to -1 dB, Operating Temperature -40 to 85 Degree C, Rejection -40 to -30 dB, Rejection Frequency 74 to 90 GHz. Tags: Low Pass. More details for AT-LPF-70-12 can be seen below.