The BWLF-13 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 1.7 dB @13GHz, Rejection 20 dB @19.4GHz, 40 dB @24.5GHz, Power 30 dBm. Tags: Die. More details for BWLF-13 can be seen below.