| 摘要 |
An antenna device including a circuit board; a pair of first antenna elements disposed symmetrically to each other about both wide surfaces of the circuit board and a pair of second antenna elements disposed symmetrically to each other about the both wide surfaces of the circuit board; a feeding terminal installed on each of the first antenna elements and each of the second antenna elements; and; and a feeding controller which feeds power selectively to at least one of the first and second antenna elements.
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