In this century, the rapid development of wireless communication and military science and technology along with the development of information society is expected to change the use of various forms of radio communication and war pattern. Therefore, satellite, wireless communication, wireless There will be many developments in the field of control and the like.;The Yagi-Uda antenna, which is mainly used as a conventional antenna for television reception, is one of the array antennas in which non-powered elements are arranged to improve directivity. Since the array antennas, as well as the length of the feed elements, are constructed around the half-wave dipole length, if the elements are placed on the ground plane and the grounding effect is used, the length of the elements can be reduced by half. In addition, when the monopole structure by the printing technique is formed on the ground plane extension line of the printed board, the size of the ground plane can be reduced, and the thin film type and the surface can be mounted. The monopole-shaped Yagi-Uda antenna, which is produced in a planar form by printing technology, is suitable for aircraft telematic transmission systems such as missiles, which require low profile to avoid air resistance. In the appropriate form of antenna.;Therefore, the present invention can arrange the non-powered waveguide element and the reflecting element in the monopole structure before and after the monopole feeding element and the monopole feeding element on the printed circuit board to improve the beam directing characteristics as well as to mount the surface of the vehicle or the moving object in a flat shape. The present invention relates to a planar monopole type Yagi-Uda antenna.
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