Patent ID: 7520246

Claim:
A power supply apparatus comprising: a power supply antenna comprising a plurality of coils disposed concentrically, the plurality of coils being prepared by bending a plurality of conductors each into a form of an arc; and matching means having capacitors connected in parallel to the respective coils of the power supply antenna, and wherein the matching means has a first tubular capacitor and a second tubular capacitor each having electrodes at axially opposite ends thereof, and also has a first electrode, a second electrode and a third electrode disposed parallel to the power supply antenna, with electrical insulation being established with respect to each other, one of the electrodes of the first capacitor being connected to the first electrode, one of the electrodes of the second capacitor being connected to the second electrode, and the other electrodes of the first and second capacitors being connected to the third electrode, the first electrode and the third electrode are disposed at opposite ends thereof, the second electrode comprising a flat plate portion having through-holes and a concave portion protruding from the flat plate portion toward the first electrode is disposed between the first electrode and the third electrode, the first capacitor passes through the through-hole and has one of the electrodes thereof connected to the first electrode, the second capacitor fits into the concave portion and has one of the electrodes thereof connected to the second electrode, and at least one of power supply portions of each of the coils constituting the power supply antenna passes through at least the first electrode and establishes an electrically connected relationship with the second electrode.