| 摘要 |
An antenna system with at least one tunable dipole element with a length adjustable conductive member disposed. The element is made of two longitudinally aligned, hollow support arms made of non-conductive material. Disposed longitudinally inside each element is a length adjustable conductive member electrically connected at one end. Each conductive member is stored on a spool that is selectively rotated to extend the conductive member into the support arm. The support arms are affixed at one end to a rigid housing. During use, the conductive members are adjusted in length to tune the element to a desired frequency. The antenna can be optimally tuned at a specific frequency for maximum gain, maximum front-to-back ratio, as a bi-directional antenna, and to provide a desired feed point impedance. An electronic control system allows the length of the conductive members to be manually or automatically adjusted to a desired frequency.
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