The first on-orbit demonstration of wireless power transmission, technology that could eventually support elements of a space solar power satellite has just been completed and published in the IEEE Journal of Microwaves. This experiment, the first flight test of a solar-to-RF Photovoltaic Radio-frequency Antenna Module (PRAM) lovingly referred to as a “sandwich module”, was performed on the U.S Airforce’s X-37 Orbital Test Vehicle, the launch of which SSP covered last May. Preliminary results have duplicated in space the expected power transmission that was tested on the ground pre-flight. Although testing is just getting started, the results show proof of concept of this prototype PRAM paving the way for the next phase of the Space Solar Power Incremental Demonstrations and Research (SSPIDR) project planned by Air Force Research Laboratory. The primary objective of SSPIDR is delivery of power to forward deployed expeditionary forces on Earth which would assure energy supply with reduced risk and lower logistical costs. The technology could eventually be used for commercial energy production.
Modular solar-to-RF panels based on the PRAM concept will enable very large radio frequency power beaming apertures to be assembled from a single panel design leading to scalability, lower mass and reduced costs.
The next step in Phase 1 of the the SSPIDR project will be the world’s first space-to-ground power beaming demonstration of a solar to-RF modular panel currently planned for 2023.