ANTENNA STRUCTURE AND INTERNAL COMBUSTION ENGINE

The present invention aims at providing an antenna structure that is not susceptible to erosion and degradation caused by high frequency wave emission and is capable of efficiently emitting high frequency wave energy in accordance with a flowing flame, and an internal combustion engine including the antenna structure and an ignition device. The internal combustion engine according to the present invention includes an antenna structure including a high frequency wave transmission line that transmits a high frequency wave and an emission antenna part for emitting the high frequency wave supplied via the high frequency wave transmission line. The emission antenna part includes a metal antenna having a rod-like shape and a ceramic layer that covers at least a part of the metal antenna.