Plasma apparatus using a valve

A plasma apparatus using a valve, which is installed in an internal combustion engine in which the combustion chamber side opening of an intake port or an exhaust port is opened and closed at a given timing with a valve head at the end of a valve stem of an intake valve or an exhaust valve, the intake port is formed in a cylinder head and connects to the combustion chamber to be part of an intake passage, the exhaust port is formed in the cylinder head and connects to the combustion chamber to be part of an exhaust passage, the valve stem fits into a guide hole penetrating from the intake port or the exhaust port to the outer wall of the cylinder head and reciprocating freely, the plasma apparatus comprising:

• a discharge device with an electrode exposed to the combustion chamber installed in the cylinder head;
• an antenna installed on the valve face of the valve head;
• an electromagnetic wave transmission line installed in the valve stem with one end connected to the antenna and the other end, covered with an insulator or dielectric and extending to a power-receiving portion, which is positioned at a location fitting into the guide hole or at a location farther from the valve head in the valve stem;
• and
• an electromagnetic wave generator for feeding electromagnetic waves to the power-receiving portion;
• wherein the plasma apparatus is configured such that discharge is generated with the electrode of the discharge device and the electromagnetic waves fed from the electromagnetic wave generator through the electromagnetic wave transmission line are radiated from the antenna at the compression stroke when the combustion chamber side opening of the intake port or the exhaust port is closed with the valve head.