| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an antenna device which can be shared for reception of radio waves having different frequencies and can be miniaturized. <P>SOLUTION: In the antenna device which is approximately T-shaped, first and second antenna elements, which are approximately linear, are provided, one end of the second antenna element is connected to the intermediate part of the first antenna element, the other end of the second antenna element is used as a feeding point, and an electric length from the feeding point to one end of the first antenna element is about 1/4 wavelength of a prescribed signal. In the antenna device, one end of a third antenna element is connected between one end and the intermediate part of the first antenna element, and an electric length from the feeding point to the other end of the third antenna element is about 3/4 wavelength of the prescribed signal. <P>COPYRIGHT: (C)2011,JPO&INPIT |
