The BWLF-12 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 1.7 dB @12GHz, Rejection 20 dB @17.9GHz, 40 dB @22.7GHz, Power 30 dBm. Tags: Die. More details for BWLF-12 can be seen below.