The BWLF-11 from Sainty-Tech Communications Limited is a Low Pass RF Filter with Frequency DC to 11 GHz, 3 dB Cutoff Frequency 11 GHz, Insertion Loss 1.6 dB @11GHz, Rejection 20 dB @16.5GHz, 40 dB @20.8GHz, Power 30 dBm. Tags: Die. More details for BWLF-11 can be seen below.