The L1FPDC from GPS Networking is a Band Pass Filter with Frequency 1.56 to 1.59 GHz, Insertion Loss 1.5 to 4 dB, Rejection 25 to 40 dB, Ripple 0.1 to 1 dB, VSWR Input 1.50:1, 2.00:1. Tags: Module with Connectors. More details for L1FPDC can be seen below.