The 4BP3855-450-2A-PP from Quantic PMI (Planar Monolithics) is a Band Pass Filter with Frequency 3.63 to 4.08 GHz, Bandwidth 450 MHz, Center Frequency 3855 MHz, Insertion Loss 1.5 dB, VSWR 1.50:1. Tags: Module with Connectors, Lumped Component Filter. More details for 4BP3855-450-2A-PP can be seen below.