| 摘要 |
It is possible to realize an antenna realizing excellent matching with impedance of an RF part without including a resonant part that accumulates large reactive power in a small volume on a finite ground formed of a body of a portable radio phone by feeding a linear conductor presenting a step structure having a part parallel to the finite ground as an antenna and juxtaposing a linear conductor having a part parallel to another one or plurality of finite grounds in close vicinity to a linear conductor having a step structure on a finite ground in contact or non-contact therewith electrically. Accordingly, it is made possible to provide a small antenna or a built-in antenna applied to a small portable radio phone.
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