The PDBF-4R5/5R1-5D4 from Sainty-Tech Communications Limited is a Band Pass Filter with Frequency 4.5 to 5.1 GHz, Center Frequency 4.8 GHz, Insertion Loss [email protected], Rejection =40 dB @3.8&5.8GHz, Upper Rejection 40 dB. Tags: Surface Mount. More details for PDBF-4R5/5R1-5D4 can be seen below.