The AT-BPF-4555-19 from AT Microwave is a Waveguide Filter with Frequency 45 to 55 GHz, Insertion Loss -2.5 to -1 dB, Operating Temperature -40 to 85 Degree C, Rejection -40 to -35 dBc, Rejection Frequency DC to 75 GHz. Tags: Band Pass. More details for AT-BPF-4555-19 can be seen below.