The AM3550B989 from Anatech Electronics is a Band Pass Filter with Frequency 3.3 to 3.8 GHz, Bandwidth 500 MHz, Center Frequency 3550 MHz, Insertion Loss 1.3 dB, Upper Rejection 15dB @ 6600-7600 MHz. Tags: Ceramic, Surface Mount, Ceramic Filter. More details for AM3550B989 can be seen below.