The AM1800B1649 from Anatech Electronics is a Band Pass Filter with Frequency 1.4 to 2.2 GHz, Bandwidth 800 MHz, Center Frequency 1800 MHz, Insertion Loss 2 dB, Rejection 8 to 50 dB. Tags: Surface Mount, Ceramic, Ceramic Filter. More details for AM1800B1649 can be seen below.