The AM1000B1347 from Anatech Electronics is a Band Pass Filter with Frequency 990 MHz to 1.11 GHz, Bandwidth 20 MHz, Center Frequency 1000 MHz, Insertion Loss 3.2 dB, Upper Rejection 65dBc @ 1200 MHz. Tags: Ceramic, Surface Mount, Ceramic Filter. More details for AM1000B1347 can be seen below.