Patent ID: 6862432

Claim:
A device for matching an antenna impedance in a portable radio telephone that includes transmission and receiving circuits, a foldable casing, the foldable casing movable between an unfolded position and a folded position, and an antenna movable between an extracted position from the foldable casing and a retracted position into the foldable casing, the device comprising: means for storing a plurality of digital voltages wherein each digital voltage is associated with a corresponding radio telephone configuration, wherein the configuration is defined by the foldable casing position, the antenna position, and whether the radio telephone is in transmitting mode or receiving mode; means for determining the foldable casing position, the antenna position, and whether the radio telephone is in transmitting or receiving mode, and for providing a first signal in response thereto; and, means for matching the impedance of the radio telephone antenna in response to the first signal, wherein the means for matching uses a digital voltage, from among the plurality of digital voltages, corresponding to the first signal.