The BWLF-12G from Sainty-Tech Communications Limited is a Low Pass RF Filter with Frequency DC to 12 GHz, 3 dB Cutoff Frequency 12 GHz, Insertion Loss 1.6 dB @12GHz, Rejection 20 dB @16.6GHz, 40 dB @18.8GHz, Power 30 dBm. Tags: Die. More details for BWLF-12G can be seen below.