The AM1900B1527 from Anatech Electronics is a Band Pass Filter with Frequency 1.675 to 2.125 GHz, Bandwidth 450 MHz, Center Frequency 1900 MHz, Insertion Loss 2 dB, Rejection 30 to 50 dB. Tags: Surface Mount, Ceramic, Ceramic Filter. More details for AM1900B1527 can be seen below.