Application of a Multiple Folding Array Antenna to a Solar Power Satellite and Its Radiation Characteristics

A Multiple Folding Array Antenna (MFAA) composed of many panels with steps can accomplish the excellent ratio of the deployed / furled surfaces, and in particular two-dimensional deployment. Therefore, this antenna is suitable to be used in space systems. We studied the application of the MFAA to a solar power satellite. A full-scaled power transmitting antenna should have a size of 1 km to be made by assembling many smaller module antennas in consideration of transportation from the ground to space. This paper describes the design of a module antenna with deployable configuration. It was shown that an MFAA can be installed in a small volume, which is included in the cargo room of a small rocket. The operation of installation and deployment in space was clarified. The antenna radiation patterns were obtained by simulation. Deformation of the patterns was recognized in a two-dimensional diagram, which is due to the mal-effect of incomplete compensation to steps and is not serious.