The BWLF-13G from Sainty-Tech Communications Limited is a Low Pass RF Filter with Frequency DC to 13 GHz, 3 dB Cutoff Frequency 13 GHz, Insertion Loss 1.6 dB @13GHz, Rejection 20 dB @17.95GHz, 40 dB @20.55GHz, Power 30 dBm. Tags: Die. More details for BWLF-13G can be seen below.