The AM1503B1394 from Anatech Electronics is a Band Pass Filter with Frequency 1.49 to 1.5 GHz, Bandwidth 7.5 MHz, Center Frequency 1503.4 MHz, Insertion Loss 2.0 dB, Upper Rejection 15 dB @ 1447.9-1462.9 MHz. Tags: Ceramic, Surface Mount, Ceramic Filter. More details for AM1503B1394 can be seen below.