| 摘要 |
An antenna for a portable, wireless communication device comprising an antenna sheath having the mechanical components of the antenna positioned therein. The sheath is provided with a first bore formed in the base end thereof which is adapted to receive an electrically conductive, connector element therein. The sheath is also provided with a second bore formed therein at the inner end of the first bore which is adapted to receive a first helical antenna element therein. The sheath is further provided with a third bore formed therein at the inner end of the second bore which is adapted to receive a second helical antenna element therein. The second and third bores have a plurality of longitudinally extending, radially spaced-apart ribs protruding inwardly into the bores for engagement with the antenna elements therein to position the antenna elements in the bores and to create air dielectric chambers between the sheath and the antenna elements.
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