Patent ID: 8836588

Claim:
An antenna device comprising: an antenna board on which a ground pattern is formed; a first feed terminal provided on the antenna board; a substantially L-shaped first antenna including a first straight portion which is substantially elongated in a first direction from a first end connected to the first feed terminal to a first connecting portion, and a second straight portion which is substantially elongated along a second direction from the first connecting portion to a second end opened, the first antenna being operable in a first band, as a communication band, which includes a predetermined resonant frequency; a second feed terminal provided on the antenna board at a distance not more than substantially one quarter a wavelength corresponding to the resonant frequency of the first antenna from the first feed terminal; a substantially L-shaped second antenna including a third straight portion which is substantially elongated in the first direction from a third end connected to the second feed terminal to a second connecting portion, and a fourth straight portion which is substantially elongated along the second direction from the second connecting portion to a fourth end opened, the second antenna being operable in a second band, as a communication band, which includes at least the resonant frequency of the first antenna; and a first protruding portion which is provided at a position between the first antenna and the second antenna so as to protrude from the ground pattern of the antenna board along the first direction, and bypasses part of a current flowing through the ground pattern between the first feed terminal and the second feed terminal, wherein the first antenna is so located as to have a first distance between the first straight portion and the first protruding portion, the second antenna is so located as to have a second distance between the third straight portion and the first protruding portion, which is shorter than the first distance, and the second distance is less than or equal to one tenth a wavelength corresponding to the resonant frequency from the second antenna.