Abstract
Software radio, which is functionalized by software, can deal with several communication systems by only one hardware system. We have proposed an equiangular spiral antenna, which can deal with circularly polarized wave, for software radio using several frequency bands. In this paper, an equiangular spiral antenna was evaluated by TLM analyses, and array antenna using the equiangular spiral antenna was investigated. As a result, the array antenna arranged with same direction, which was made the most of the unit antenna characteristics, performed well in the gain and axial ratio characteristics.
