Patent ID: 6864844
Filing Date: 2005-03-08
Classification: H01Q

Abstract:
1. An antenna device for use in an electronic equipment, comprising: a first conductor having a length which is a half length of a wavelength for a first resonant frequency; a feed point to which an end of the first conductor is connected; a plate-shaped second conductor on which the feed point is located and on which another end of the first conductor is grounded; and an impedance element which is loaded on the first conductor and which varies at least one of the first resonant frequency and a second resonant frequency, wherein said first conductor comprises a primary portion extending from the plate-shaped second conductor, said impedance element being loaded on said first conductor in a position other than said primary portion, and wherein a length of said primary portion is in a range from 0.05 to 0.10 times a wavelength of the first resonant frequency.