Patent ID: 7415265

Claim:
A portable electric apparatus comprising: a radio tuner which receives at least one of satellite waves and terrestrial waves by an antenna; an optical disc drive which drives an optical disc to reproduce data from the optical disc; a casing containing therein said radio tuner and said optical disc drive; a lid arranged on a top surface of said casing, wherein said lid is openable to place the optical disc into and remove the optical disc out from said optical disc drive; and an earth plate electrically connected to said antenna; wherein said antenna is mounted to said lid, and said antenna comprises: an antenna unit; and wherein the antenna unit comprises: a circuit board; an antenna element, which is mounted on an upper surface of the circuit board, and which comprises a dielectric substrate, a radiation surface formed on a top surface of the dielectric substrate, and a ground surface formed on a bottom surface of said dielectric substrate; and a shield case which shields electric parts mounted on a bottom surface of said circuit board; wherein the earth plate has an area which is larger than a bottom area of said antenna unit; wherein the antenna device is contained in the lid; and wherein said antenna unit is mounted on said earth plate.