Share this article Share this article WASHINGTON, June 10, 2021 /PRNewswire/ -- It has been one year since U.S. Naval Research Laboratory engineers launched PRAM, the Photovoltaic Radio-frequency Antenna Module, aboard the Air Force X-37B Orbital Test Vehicle on May 17, 2020. The mission is part of a comprehensive investigation into prospective terrestrial use of solar energy captured in space. Image of the Photovoltaic Radio-frequency Antenna Module (PRAM) with a 12-inch ruler for scale. The hardware is the first orbital experiment designed to convert sunlight for microwave power transmissi...