Patent ID: 7675469

Claim:
An antenna device configured to be fed at a feed portion included in a printed board of a radio apparatus, the antenna device comprising: a feed element connected to the feed portion; a first parasitic element having a first end portion and a second end portion, the first end portion being arranged closer to at least a portion of the feed element than the second end portion so as to be electrically coupled to the feed element, the first parasitic element being loaded with a first frequency shifter so that a resonant frequency of the first parasitic element is rendered variable; and a second parasitic element having a third end portion and a fourth end portion, the third end portion being arranged closer to at least a portion of the feed element than the fourth end portion so as to be electrically coupled to the feed element, the second parasitic element being loaded with a second frequency shifter so that a resonant frequency of the second parasitic element is rendered variable.