One of the known technologies related to the present invention is a technology for converting power energy obtained through solar electricity generation in space, into a microwave and transmitting the microwave to a specific point of the ground. This technology is applied to the development of a technology for supplying electric energy necessary for a light aircraft and the like.
These technologies are schemes for converting power energy itself only into a microwave and transmitting/receiving the microwave, and are used for transmitting a large capacity of power obtained from space, to the ground. Here, the used converted microwave is of a linear type close to light and has a disadvantage that it is available within a visible distance only. Also, the converted microwave has a limitation of a wireless distance range, needs separate transmission/reception devices and base station or relay station construction, and has a disadvantage that its use is restricted to a special use.