The BWBF-3R1/3R5 from Sainty-Tech Communications Limited is a Band Pass Filter with Frequency 3.1 to 3.5 GHz, Center Frequency 3.3 GHz, Insertion Loss [email protected], Rejection =35 dB @2.5&4.2GHz, Upper Rejection 35 dB. Tags: Surface Mount. More details for BWBF-3R1/3R5 can be seen below.