The AM1800B1353 from Anatech Electronics is a Band Pass Filter with Frequency 1.79 to 1.81 GHz, Bandwidth 20 MHz, Center Frequency 1800 MHz, Insertion Loss 3.6 dB, Upper Rejection 65 dBc @ 2000 MHz. Tags: Ceramic, Surface Mount, Ceramic Filter. More details for AM1800B1353 can be seen below.