The AT-LPF-57-19 from AT Microwave is a Waveguide Filter with Frequency 40 to 57 GHz, Insertion Loss -2.5 to -1 dB, Operating Temperature -40 to 85 Degree C, Rejection -40 to -30 dB, Rejection Frequency 61 to 75 GHz. Tags: Low Pass. More details for AT-LPF-57-19 can be seen below.