The AM1812B1255 from Anatech Electronics is a Band Pass Filter with Frequency 1.8095 to 1.8155 GHz, Bandwidth 6 MHz, Center Frequency 1812.5 MHz, Insertion Loss 2 dB, Rejection 10 to 50 dB. Tags: Surface Mount, Ceramic, Ceramic Filter. More details for AM1812B1255 can be seen below.