The AM3700B1331 from Anatech Electronics is a Band Pass Filter with Frequency 3647.5 to 3752.5 MHz, Bandwidth 105 MHz, Center Frequency 3700 MHz, Insertion Loss 3.5 dB, Rejection 60 to 60 dB. Tags: Surface Mount, Ceramic, Ceramic Filter. More details for AM3700B1331 can be seen below.