The 211B from ACST GmbH is a Frequency Multiplier with Input Frequency 155 to 185 GHz, Output Frequency 310 to 370 GHz, Input Power 20 to 140 mW, Output Power 16.02 dBm, Frequnecy 155 to 185 GHz. Tags: Waveguide, Frequency Doubler, Waveguide Multiplier. More details for 211B can be seen below.