The PDBF-16/20 from Sainty-Tech Communications Limited is a Band Pass Filter with Frequency 16 to 20 GHz, Center Frequency 18 GHz, Insertion Loss 2.0@18GHz, Rejection =25 dB @13GHz, =40 dB @23GHz, Upper Rejection 40 dB. Tags: Surface Mount. More details for PDBF-16/20 can be seen below.