The AM3104 from Atlanta Micro is a Tunable Filter with Frequency 2.5 to 6.5 GHz, Tunable Frequency 2.5 to 6.5 GHz, Bandwidth 4000 MHz, Rejection 40 dB, Input Power 27 dBm. Tags: Surface Mount, Digitally Controlled. More details for AM3104 can be seen below.