The PDBF2R4/R54-16B2 from Sainty-Tech Communications Limited is a Band Pass Filter with Frequency 2.2 to 2.5 GHz, Center Frequency 2.35 GHz, Insertion Loss [email protected], Rejection =25 dB @1.9&3.0GHz, Upper Rejection 25 dB. Tags: Surface Mount. More details for PDBF2R4/R54-16B2 can be seen below.