The AT-AM4-5590-18T from AT Microwave is a Frequency Multiplier with Input Frequency 13.75 to 22.5 GHz (Input), 55 to 90 GHz(Output), Output Frequency 55 to 90 GHz, Input Power 13 to 15 dBm, Output Power 18 dBm, Harmonics -40 to -25 dBc. Tags: Waveguide, Active, Waveguide Multiplier. More details for AT-AM4-5590-18T can be seen below.