The AM3665B124 from Anatech Electronics is a Band Pass Filter with Frequency 3.6 to 3.73 GHz, Bandwidth 130 MHz, Center Frequency 3665 MHz, Insertion Loss 1.17 dB, Upper Rejection 30dB @ 3200-3400 MHz. Tags: Ceramic, Surface Mount, Ceramic Filter. More details for AM3665B124 can be seen below.