| 摘要 |
PROBLEM TO BE SOLVED: To provide an antenna system capable of switching and using four kinds of polarized waves which are a horizontal polarized wave, a vertical polarized wave, a clockwise circular polarized wave, and a counterclockwise circular polarized wave. SOLUTION: The antenna system has feed points P1, P2, P3, and P4 on conductive plate materials 12 for an antenna element disposed apart from and opposite to each other on the surface of a ground plate 11, and also has a feed substrate 30 mounted with a switch 31 and a feed substrate 40 mounted with a switch 41 provided on the second surface 11b of the ground plate 11. An RF device controls the switch 31 to make the feed point P1 feed electricity during the use of a horizontal polarized wave and controls the switch 31 to make the feed point P2 feed electricity during the use of a vertical polarized wave, and controls the switch 41 to make the feed point P3 perform +90°phase feeding during the use of a clockwise circular polarized wave and controls the switch 41 to make the feed points P3 and P4 perform -90°phase feeding during the use of the counterclockwise circular polarized wave. COPYRIGHT: (C)2008,JPO&INPIT
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