The AM1601B1157 from Anatech Electronics is a Band Pass Filter with Frequency 1.59 to 1.62 GHz, Bandwidth 17 MHz, Center Frequency 1601 MHz, Insertion Loss 4.8 dB, Upper Rejection 15 dB @ 1581 MHz. Tags: Ceramic, Surface Mount, Ceramic Filter. More details for AM1601B1157 can be seen below.