The AT-AM4-5590-12 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 10 to 15 dBm, Output Power 12 dBm, Harmonics -40 to -25 dBc. Tags: Waveguide, Active, Waveguide Multiplier. More details for AT-AM4-5590-12 can be seen below.