The 218B from ACST GmbH is a Frequency Multiplier with Input Frequency 165 to 260 GHz, Output Frequency 330 to 500 GHz, Input Power 5 to 15 mW, Output Power -10 to -3 dBm, Frequnecy 165 to 260 GHz. Tags: Waveguide, Frequency Doubler, Waveguide Multiplier. More details for 218B can be seen below.