The BWLF-22 from Sainty-Tech Communications Limited is a Low Pass RF Filter with Frequency DC to 22 GHz, 3 dB Cutoff Frequency 22 GHz, Insertion Loss 2.0 dB @22GHz, Rejection 20 dB @33.5GHz, 40 dB @38GHz, Power 30 dBm. Tags: Die. More details for BWLF-22 can be seen below.