| 摘要 |
An antenna is provided having a relatively simple structure as arranged capable of operating at desired frequencies. An antenna comprises: a chassis consisting mainly of a grounding conductor provided as a bottom surface, a ceiling conductor provided as a top surface opposite to the grounding conductor, and side conductors provided as antenna sides; at least one opening provided in apart of said chassis, which opens for radiation of electric waves; a feeding point provided on said grounding conductor for power supply via a predetermined feeding line from the outside; and an antenna element connected to said feeding point at one end while being connected to said ceiling conductor via a frequency selectable circuit at the other end, and surrounded by the side conductors.
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