The CBF01018050B from Cernex Inc is a Band Pass Filter with Frequency 1.57 to 1.58 GHz, Bandwidth 12 MHz, Insertion Loss 8 dB, Upper Rejection 50 dB at 1.603GHz, Lower Rejection 65 dB at 1.543GHz. Tags: Surface Mount, Ceramic, Ceramic Filter. More details for CBF01018050B can be seen below.