| 摘要 |
<p>Radiotelephones having retractable antenna systems are disclosed which include a housing, a transceiver disposed within the housing, a user interface which is electrically coupled to the transceiver, a non-radiating feed movably mounted within the housing and extendible from the housing so as to have an extended position and a retracted position, and an antenna. The non-radiating feed is electrically coupled to the antenna, and connection means are provided for electrically coupling the transceiver to the non-radiating feed. In one embodiment, the antenna is physically supported by the non-radiating feed and is thus mounted in an extended state when the non-radiating feed is in an extended position, and is mounted in a retracted state when the non-radiating feed is in the retracted position. Preferably, the antenna exhibits approximately the same electrical length in both the extended and retracted states, and the antenna is substantially isolated from the housing of the radiotelephone when the antenna is in the extended state.</p> |
