The AM1800B1000 from Anatech Electronics is a Band Pass Filter with Frequency 1.78 to 1.82 GHz, Bandwidth 40 MHz, Center Frequency 1800 MHz, Insertion Loss 2 dB, Upper Rejection 30 dB @ 1900 MHz. Tags: Ceramic, Surface Mount, Ceramic Filter. More details for AM1800B1000 can be seen below.