| 摘要 |
An omnidirectional antenna includes a substrate, a signal feed-in portion, a first radiation unit, and a second radiation unit. The first radiation unit is located on a first surface of the substrate, and electrically connected to a first circuit of the first surface. The first radiation unit has a first extension end and a second extension end. The second radiation unit is located on a second surface of the substrate, and electrically connected to a second circuit of the second surface. The second radiation unit has a third extension end and a fourth extension end. The first extension end is disposed corresponding to the third extension end, and the second extension end is disposed corresponding to the fourth extension end. The signal feed-in portion is located on the first circuit and the second circuit. Thus, the impedance is improved, a wider bandwidth is achieved, and the process is simplified.
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