| 摘要 |
PROBLEM TO BE SOLVED: To provide a directional antenna which can be mounted on a small-sized device and can freely change the direction of radiation, and to provide a directivity control method therefor and an antenna system. SOLUTION: In the directional antenna which includes a power feeding patch 2 and at least one parasitic path 3 disposed around the power feeding path and in which the direction of electromagnetic wave radiation is changed by grounding a current induced in the parasitic patch 3, the parasitic patch 3 comprises GND short-circuiting lines 4a, 4b1, 4b2, 4b3 for grounding at positions different from the center of an exciting direction, and each of the GND short-circuiting lines comprises a switch for changing over whether or not the parasitic patch 3 and the ground are to be electrically connected. COPYRIGHT: (C)2006,JPO&NCIPI
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