The PDBF-3/4-5D4 from Sainty-Tech Communications Limited is a Band Pass Filter with Frequency 3.2 to 3.9 GHz, Center Frequency 3.5 GHz, Insertion Loss [email protected], Rejection =30 dB @2.6 GHz, =35 dB @4.7 GHz, Upper Rejection 35 dB. Tags: Surface Mount. More details for PDBF-3/4-5D4 can be seen below.