The BWLF-9 from Sainty-Tech Communications Limited is a Low Pass RF Filter with Frequency DC to 9 GHz, 3 dB Cutoff Frequency 9 GHz, Insertion Loss 1.7 dB @9.0GHz, Rejection 20 dB @13.6GHz, 40 dB @17.1GHz, Power 30 dBm. Tags: Die. More details for BWLF-9 can be seen below.