| 摘要 |
PROBLEM TO BE SOLVED: To provide an antenna system which enables the directivity thereof to be controlled and can be small-sized. SOLUTION: An antenna body 1 includes: an antenna element 11 of an upper layer; a ground part (ground) 12 of a lower layer; a dielectric 13 held by the antenna element 11 and the ground part 12; a columnar conductor (center post) 14 connecting the center of the antenna element 11 and the center of the ground part 12; and three power feeding conductors 16 (16-1 to 16-3) provided at power feeding points 15-1 to 15-3 on the same circumference respectively and connected with the antenna element 11. The antenna body 1 is disk-shaped as a whole and feeds signals of at least different amplitudes or phases to the power feeding points 15-1 to 15-3. COPYRIGHT: (C)2006,JPO&NCIPI
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