| 摘要 |
Dual band retractable antenna system with capacitive coupling includes a helical antenna for operating at stand-by mode, the helical having ¼ wavelength; a whip, which penetrates the helical, for operating at busy mode, the whip having ¼ wavelength; a stopper for catching the whip when the antenna is extended out; a sleeve mounted to one end of the helical, for operating as a feed point when the whip is extended out; a capacitive coupling arrangement placed between the helical and the sleeve, for capacitively coupling the helical to the sleeve; and a matching circuit connected between the sleeve and the antenna system, so that the antenna system operates for both frequency bands.
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