The BWLF-18 from Sainty-Tech Communications Limited is a Low Pass RF Filter with Frequency DC to 18 GHz, 3 dB Cutoff Frequency 18 GHz, Insertion Loss 1.8 dB @18GHz, Rejection 20 dB @26.5GHz, 40 dB @33.4GHz, Power 30 dBm. Tags: Die. More details for BWLF-18 can be seen below.