To provide an electric power transmission and reception coil used for a contactless charging system for a vehicle such that an impedance matching state and a matching state of a transmission mode are improved, and an influence of a conductor of a shield coil etc., of the electric power transmission and reception coil on electric power transmission and reception performance is suppressed.
A first spiral conductor 40 draws a part of a spiral shape inwardly from an outer end 46 to a feed point 48. A spiral coaxial cable 42 has one end of its inner conductor connected to one end of the first spiral conductor 40 at the feed point 48, and draws a part of the spiral shape inwardly from the feed point 48. Then the spiral coaxial cable is led downward out of an electric power transmission and reception coil 16 at a coaxial cable separation point 50. A second spiral conductor 44 has one end connected to an outer conductor of the spiral coaxial cable 42 at the coaxial cable separation point 50. The second spiral conductor 44 draws a part of the spiral shape inwardly from the coaxial cable separation point 50 and terminates in an open state at an inner end 52.
HORI SATOSHI
TABATA TAKANOBU
