| 摘要 |
In order to have an antenna apparatus small in size and capable of switching its directivity pattern without degrading its antenna efficiency, the present invention provides an antenna apparatus having a driven element formed at an approximately center position of a planar printed circuit board and parasitic elements not performing feeding formed before and behind the first antenna element, respectively, so that the driven element is caused to function as a radiator and either one of the parasitic elements is made to have a length as long as an electrical length of a radiator or slightly shorter than that to function as a director and the other one of the parasitic elements is left to have an electrical length longer than that of the radiator to function as a reflector.
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