The BWLF-19 from Sainty-Tech Communications Limited is a Low Pass RF Filter with Frequency DC to 19 GHz, 3 dB Cutoff Frequency 19 GHz, Insertion Loss 1.8 dB @19GHz, Rejection 20 dB @27.9GHz, 40 dB @35.5GHz, Power 30 dBm. Tags: Die. More details for BWLF-19 can be seen below.