ANTENNA STRUCTURE, HIGH-FREQUENCY RADIATION PLUG, INTERNAL COMBUSTION ENGINE, AND MANUFACTURING METHOD FOR ANTENNA STRUCTURE

摘要

The purpose of the present invention is to improve the radiation efficiency of high-frequency waves in an antenna structure in which a radiation antenna is integrated with a high-frequency transmission line of a laminated structure. The present invention is an antenna structure characterized by comprising: a columnar high-frequency transmission line which is constituted by laminating and integrating a plurality of sheet-like insulators, and which has a high-frequency transmission conductor embedded therein; a covering insulator that is laminated so as to cover the emission end surface from which high-frequency waves are emitted in the high-frequency transmission line; and a radiation antenna that is embedded inside the covering insulator or between the emission end surface and the covering insulator such that the high-frequency waves input from the emission end surface are radiated to a space to which the covering insulator is exposed.