| 摘要 |
An antenna structure ( 142 ) having a retractable element ( 124 ) and a reactive antenna circuit ( 118 ). The antenna structure components conductively disconnect the reactive circuit ( 118 ) from the RF drive ( 138 ) when the retractable element ( 124 ) is extended, and conductively reconnect them when the retractable element ( 124 ) is retracted. The retractable element ( 124 ) is also conductively connected to the RF drive ( 138 ) when the retractable element ( 124 ) is extended and conductively disconnected when the retractable element ( 124 ) is retracted. The reactive circuit ( 118 ) maintains substantially similar impedance to the retractable element ( 124 ) for an RF antenna circuit when the retractable antenna ( 142 ) is in both the extended and the retracted positions.
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