The AM2575B1437 from Anatech Electronics is a Band Pass Filter with Frequency 2.56 to 2.59 GHz, Bandwidth 30 MHz, Center Frequency 2575 MHz, Insertion Loss 2 dB, Rejection 20 to 40 dB. Tags: Surface Mount, Ceramic, Ceramic Filter. More details for AM2575B1437 can be seen below.