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Whip antenna

In mobile communication, a mobile terminal or a mobile radio apparatus must constantly exchange information with base stations both in a standby state and during communication. Mobile terminals commonly have an antenna apparatus for ensuring sufficient transmitting/receiving rates and signal quality. Generally, mobile terminals have an antenna device for data communication, which includes a helical antenna and a whip antenna. A typically used antenna for the mobile phone is a combination of a helical antenna and a whip antenna. The mobile telephone has a whip antenna which may be extendable and retractable. A monopole whip antenna is essentially a wire that extends along or away from the device and is fed by the printed circuit board (PCB) of the device. In place of the whip antenna, a helical antenna fixed to a case of the mobile telephone may alternatively be provided. Further, the antenna may be integrated into the case of the mobile phone. When the mobile phone is in signal waiting state or the mobile phone's radio environment is favorable, only the helical antenna operates. When the mobile phone is used for conversation or the mobile phone's radio environment is poor, both the helical antenna and the whip antenna are operational.

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