Patent ID: 7136022
Filing Date: 2006-11-14
Classification: H01Q

Abstract:
1. A radio apparatus comprising: a feeder circuit; a first antenna element including a first end connected to the feeder circuit and a second end, the first antenna element folding back at a folding portion and having a forward path from the first end to the folding portion and a backward path from the folding portion to the second end, a length from the first end via the folding portion to the second end being a half of a wavelength of a first frequency, the second end being grounded and positioned no farther than one-tenth of the wavelength of the first frequency away from the first end, and the forward path and the backward path short-circuiting at a shorting bridge of the first antenna element; and a second antenna element, which shares with the first antenna element a part of the forward path from the first end to a diverging point between the first end and the shorting bridge, and which has an open end, a length from the first end via the diverging point to the open end being one-fourth of a wavelength of a second frequency, and the second frequency being higher than the first frequency.