The BWBF-17R4/19R4 from Sainty-Tech Communications Limited is a Band Pass Filter with Frequency 17.4 to 19.4 GHz, Center Frequency 18.4 GHz, Insertion Loss [email protected], Rejection =40 dB @14&21GHz, Upper Rejection 40 dB. Tags: Surface Mount. More details for BWBF-17R4/19R4 can be seen below.