The AM3139 from Atlanta Micro is a Tunable Filter with Frequency 2.5 to 6 GHz, Tunable Frequency 2.5 to 6 GHz, Bandwidth 3500 MHz, Rejection 40 dB, Input Power 27 dBm. Tags: Surface Mount, Voltage Controlled, Analog Tunable. More details for AM3139 can be seen below.