The BWLF-5R5 from Sainty-Tech Communications Limited is a Low Pass RF Filter with Frequency DC to 5.5 GHz, 3 dB Cutoff Frequency 5.5 GHz, Insertion Loss 1.7 dB @5.5GHz, Rejection 20 dB @9GHz, 40 dB @11.65GHz, Power 30 dBm. Tags: Die. More details for BWLF-5R5 can be seen below.