The 4020BP39A0160 from Johanson Technology is a Band Pass Filter with Frequency 3.94 to 4.1 GHz, Bandwidth 160 MHz, Insertion Loss 1.8 dB, Rejection 34 dB, Power 0.5 W. Tags: Surface Mount, Ceramic, Ceramic Filter. More details for 4020BP39A0160 can be seen below.