| 摘要 |
A flat and leveled F antenna formed on a printed circuit board to be adopted on a notebook computer or a portable electronic device with a limited space has an open end on the bi-frequency or tri-frequency antenna with calculated resonate lengths of different frequencies to support multi-frequency antennae. The equivalent length from the open end and the signal feed end is ¼ of the wavelength of the waves to be emitted by the antenna. Antennae of different frequencies have different resonant lengths. The working frequency spectrum of the antenna can be adjusted by altering the shape of the open end.
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