Another idea for power is to beam the power to the surface, a solar power satellite would send the power down to the surface to a rectifying antenna (aka rectenna) receiver.[48] 245 GHz, laser, in-situ rectenna construction, and 5.8 GHz designs have been studied.[49] One idea is combine this technology to with Solar Electric Propulsion to achieve a lower mass that the surface solar power.[49] The big advantage is that the rectennas should be immune to dust and weather changes, and with the right orbit, a solar power Mars satellite could beam power down continuously to the surface.[49]