The BFCW-542 from Mini Circuits is a Space Qualified RF Filter with Frequency 4.7 to 6 GHz, Center Frequency 5350 MHz, Stop Band Frequency DC to 12000 MHz, Power 1 W, Insertion Loss 1.3 to 1.8 dB. Tags: Surface Mount. More details for BFCW-542 can be seen below.