The 1223B-12AC from ACST GmbH is a Frequency Multiplier with Input Frequency 12.92 to 21.66 GHz, Output Frequency 155 to 260 GHz, Input Power 0 to 5 dBm, Output Power 4 to 11 dBm, VSWR 1.80:1. Tags: Waveguide, Waveguide Multiplier. More details for 1223B-12AC can be seen below.