The AT-BPF-4757-15 from AT Microwave is a Waveguide Filter with Frequency 47 to 57 GHz, Insertion Loss -1.5 to -0.8 dB, Operating Temperature -40 to 85 Degree C, Rejection -40 to -30 dB, Rejection Frequency DC to 75 GHz. Tags: Band Pass. More details for AT-BPF-4757-15 can be seen below.