The AM1651B1387 from Anatech Electronics is a Band Pass Filter with Frequency 1.62 to 1.67 GHz, Bandwidth 48.5 MHz, Center Frequency 1651 MHz, Insertion Loss 1.5 dB, Lower Rejection 30 dB @ 1518-1559 MHz. Tags: Ceramic, Surface Mount, Ceramic Filter. More details for AM1651B1387 can be seen below.