An optical heterodyne system provides the radiation source and beam scan control of a millimeter wave (MMW) array antenna. The heterodyne system is an optical feed system to produce the MMW by mixing the optical outputs from two lasers, distribute the signal source to an array of radiating elements...http://www.google.de/patents/US5677697?utm_source=gb-gplus-sharePatent US5677697 - Millimeter wave arrays using Rotman lens and optical heterodyne
