The 1218B-24AC from ACST GmbH is a Frequency Multiplier with Input Frequency 13.75 to 20.83 GHz, Output Frequency 330 to 500 GHz, Input Power 0 to 5 dBm, Output Power -10 to 1 dBm, VSWR 1.80:1. Tags: Waveguide, Waveguide Multiplier. More details for 1218B-24AC can be seen below.