| 摘要 |
A portable telephone with an extendible antenna automatically switches an antenna mode according to a received signal strength. The portable telephone measures an RSSI value while a call is processed in an internal antenna mode where the antenna is retracted, to compare the measured RSSI value with a threshold value. If the RSSI value is lower than the threshold value, the antenna is extended, thereby switching the antenna mode to an external antenna mode. In the meantime, if the call is terminated, the antenna is retracted, switching the antenna mode back to the internal antenna mode.
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