Patent ID: 7416135

Claim:
An IC tag, comprising: a dielectric body having a shape of a plate; a first transmission metal plate for transmission fixed to a first surface of the dielectric body; a second transmission metal plate for transmission fixed to a second surface of the dielectric body for constituting an antenna together with the first transmission metal plate, wherein both outer edges of the first transmission metal plate and the second transmission metal plate face each other via the dielectric body with a misalignment of λ/30 or less in a direction parallel with the first and second surfaces of the dielectric body, wherein the value λ is a wavelength of an electric wave in the dielectric body, wherein the second transmission metal plate includes a hole; a matching metal plate for matching fixed to the dielectric body within the hole, forming a slit together with an inner surface of the hole, and being electrically connected with the first transmission metal plate via a through hole penetrating the dielectric body; and an IC chip surface-mounted to connect the second transmission metal plate with the matching metal plate over the second surface of the dielectric body.