The QWBF-3625-4200-40 from Qualwave is a Waveguide Filter with Frequency 3.625 to 4.2 GHz, Insertion Loss 0.4 dB, Operating Temperature -40 to 60 Degree C, Rejection -65 to -40 dB, Rejection Frequency 3.4 to 4.9 GHz. Tags: Band Pass. More details for QWBF-3625-4200-40 can be seen below.