The AM1575B321 from Anatech Electronics is a Band Pass Filter with Frequency 1.57 to 1.58 GHz, Bandwidth 4 MHz, Center Frequency 1575 MHz, Insertion Loss 1.5 dB, Upper Rejection 45 dB 1850-1910 MHz. Tags: Ceramic, Surface Mount, Ceramic Filter. More details for AM1575B321 can be seen below.