2021 年 65 巻 224 号 p. 2-11
We have developed a GPS solar watch for women, Cal.3X. Cal.3X has been downsized by developing a secondary battery and a planar antenna. In the development of the planar antenna, we tried to achieve both downsizing and reception performance of the antenna. Also, the usability of the GPS solar watch has been simplified to realize a simple design. As a result, we have realized a GPS solar watch that is easy for women to use.