| 摘要 |
PROBLEM TO BE SOLVED: To improve impedance characteristics at a resonance frequency of an antenna element covering a high frequency band and lower a frequency of the resonance band, thereby further reducing a size of an antenna device.SOLUTION: An antenna device according to an embodiment comprises: a first antenna element whose one end is connected to a power feed terminal and whose other end is opened; a second antenna element whose one end is connected to a first position set on the first antenna element and whose other end is opened; and a third antenna element whose one end is connected to a second position set between the first position and the other end of the first antenna element and whose other end is opened. An element length of the first antenna element is set at approximately 1/4 of a wavelength corresponding to a first resonance frequency. The second antenna element is arranged parallel to the first antenna element and has an element length set at approximately 1/4 of a wavelength corresponding to a second resonance frequency. At least a part of the third antenna element is arranged close to the second antenna element. |
