Patent ID: 7358906

Claim:
An antenna device comprising: a substrate having a power supply part configured to supply first and second currents, and a ground part in a vicinity of the power supply part and connected to ground; a common forward path part extending from the power supply part, and having a branching point; a first monopole antenna comprising the common forward path part, a first forward path part extending from the branching point of the common forward path part, a first folded part folded from the first forward path part, and a first backward path part extending from the first folded part and extending to a first ground terminal connected to the ground part of the substrate, wherein said first monopole antenna is formed of a first conductive line having a first entire length that is determined in accordance with a first resonant frequency; and a second monopole antenna element comprising the common forward path part, a second forward path part extending from the branching point of the common forward path part, a second folded part folded from the second forward path part, and a second backward path part extending from the second folded part to reach a second ground terminal connected to the ground part of the substrate, wherein said second monopole antenna is formed of a second conductive line having a second entire length that is determined in accordance with a second resonant frequency.