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BriefENERGY

Space Solar Wireless Power Transmission Prototype SkyTether Completes 100-Watt-Level Test in Low Earth Orbit

Japan's JAXA SkyTether space solar power transmission prototype successfully transmits 100 watts of electricity via microwave from low Earth orbit to ground receiving station.

Japan's Aerospace Exploration Agency (JAXA) announced on July 15 that its SkyTether space solar wireless power transmission prototype successfully completed a 100-watt-level microwave power transmission test in low Earth orbit at approximately 400 kilometers altitude. The prototype satellite's solar panels generated power in orbit, then transmitted 100 watts of electricity via a 3-meter-diameter phased array antenna at 2.45 GHz to a ground rectenna, with a conversion efficiency of approximately 12 percent.

JAXA SkyTether project lead Takashi Yamada stated: "A hundred watts may seem insignificant, but this is the first time an end-to-end wireless power transmission chain has been verified in a real space environment. The next target is kilowatt-level transmission by 2032 and megawatt-level by 2035."