The BWLF-20G from Sainty-Tech Communications Limited is a Low Pass RF Filter with Frequency DC to 20 GHz, 3 dB Cutoff Frequency 20 GHz, Insertion Loss 1.8 dB @20GHz, Rejection 20 dB @27.1GHz, 40 dB @31.6GHz, Power 30 dBm. Tags: Die. More details for BWLF-20G can be seen below.