| 摘要 |
A slot antenna disposed on a substrate including a first surface and an opposite second surface includes a feeding portion, a first radiation portion, a second radiation portion, and a third radiation portion. The feeding portion is disposed on the first surface, and operable to feed electromagnetic signals. The first radiation portion electronically connected to the feeding portion is circular-shaped and disposed on the first surface. The second radiating portion is disposed on the second surface and defines a slot. The second radiation portion couples the first radiation portion to radiate the electromagnetic signals. The third radiation portion is ring-shaped and disposed on the second surface. The third radiation portion couples the first radiation portion to radiate the electromagnetic signals. The first radiation portion, the second radiation portion, and the third radiation portion respectively radiate electromagnetic signals with different frequencies. The second radiation portion is grounded.
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