The 1216D-4AC from ACST GmbH is a Frequency Multiplier with Input Frequency 10.75 to 18.75 GHz, Output Frequency 43 to 75 GHz, Input Power 0 to 5 dBm, Output Power 19 to 23 dBm, VSWR 1.80:1. Tags: Waveguide, Waveguide Multiplier. More details for 1216D-4AC can be seen below.