The 3960BP39A1584 from Johanson Technology is a Band Pass Filter with Frequency 3.17 to 4.75 GHz, Bandwidth 1584 MHz, Insertion Loss 2.5 dB, Rejection 30 dB, Power 0.5 W. Tags: Surface Mount, Ceramic, Ceramic Filter. More details for 3960BP39A1584 can be seen below.