A capsule-type endoscope 20 that has a CCD 23 arranged at an end portion in a longitudinal direction and a power receiving coil 21 that receives an electric power by means of a change in a magnetic field in the longitudinal direction has a structure that e...

A power transmission system for supplying energy to a device operating on electrical energy taken by a power receiving antenna includes a driving unit supplied with electric power from a power supply and generating an AC current and a power transmission an...

A wireless power feeding system includes a plurality of power transmission antennas, each including a resonance circuit including a power transmission coil and a capacitor located so as to generate a magnetic field in a desired direction, a controller cont...