The AT-HPF-50-15 from AT Microwave is a Waveguide Filter with Frequency 50 to 75 GHz, Insertion Loss -2.5 to -1 dB, Operating Temperature -40 to 85 Degree C, Rejection -40 dBc, Rejection Frequency DC to 46 GHz. Tags: High Pass. More details for AT-HPF-50-15 can be seen below.