| 摘要 |
An antenna apparatus 1 has an antenna substrate 21 composed of a separator 23 and electrolyte layers 24 a and 24 b disposed on both surfaces of the separator 23 ; an antenna pattern 22 a disposed on the solid electrolyte layer 24 a; and an antenna pattern 22 b disposed on the solid electrolyte layer 24 b. The antenna patterns 22 a and 22 b are made of an electroconductive plastic. When a DC voltage is applied between the antenna patterns 22 a and 22 b, ions can be doped to one of the antenna patterns 22 a and 22 b, whereas ions can be undoped form the other of the antenna patterns 22 a and 22 b. In other words, one of the antenna patterns 22 a and 22 b can become a conductor, whereas the other thereof can become an insulator.
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