| 摘要 |
A dual-band antenna for mobile communication unit is provided with a support made of an insulating material, double stranded helical conductors, and a coaxial feeder connected to an end of each of the helical conductors. The double stranded helical conductors are wound in an identical direction on the support without intersecting each other to have different resonance frequencies, respectively, a winding region of the second helical conductor being a part of that of the first helical conductor. When a voltage is applied to the first and the second helical conductors through the coaxial feeder, the antenna operates in the optimum performance at two frequency bands. As a result, the unit can use a desired different mobile telecommunication service without changing it. Further, the inventive antenna is designed to be small in size to thereby allow it to be adapted on the mobile telecommunication unit.
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