The AM1587B1172 from Anatech Electronics is a Band Pass Filter with Frequency 1.57 to 1.61 GHz, Bandwidth 45 MHz, Center Frequency 1587.5 MHz, Insertion Loss 3 dB, Upper Rejection 18 dB @ 1625 MHz. Tags: Ceramic, Surface Mount, Ceramic Filter. More details for AM1587B1172 can be seen below.