| 摘要 |
PROBLEM TO BE SOLVED: To obtain an antenna device which can operate simultaneously with respect to a plurality of frequency bands, and does not project from a case body of a wireless installation by reducing extremely a physical occupied space. SOLUTION: An antenna device comprises a radial conductor 22 formed in a flat plane manner in an upward direction of an earth conductor 21 so that an electric length is set to be generally about quarter times a first wavelength; a radial conductor 23 which is installed so as to surround the radial conductor 22 away from an edge of the radial conductor 22 at a sufficiently smaller gap than the first wavelength, and is formed linearly with bending so that the electric length is generally about quarter times a second wavelength; a conductor line 24 for electrically connecting the radial conductors 22, 23; and a feeding point 25 to be fed from between the radial conductors 22, 23 and the earth conductor 21. |
