The AT-HPF-60-12 from AT Microwave is a Waveguide Filter with Frequency 60 to 90 GHz, Insertion Loss -1.5 to -0.8 dB, Operating Temperature -40 to 85 Degree C, Rejection -40 dBc, Rejection Frequency DC to 56 GHz. Tags: High Pass. More details for AT-HPF-60-12 can be seen below.