Antenna impedance matching device and method for a portable radio telephone
First Claim
1. 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.
1 Assignment
0 Petitions
Accused Products
Abstract
A device for matching an antenna impedance in a portable radio telephone having transmission and receiving circuits, a foldable casing enclosing the radio, the foldable casing movable between an unfolded position and a folded position, an antenna movable between an extracted position from the foldable casing and a retracted position into the foldable casing includes means for sensing whether the foldable casing is in the unfolded position and for sensing whether the antenna is in the extracted position, and for providing a sensing signal in response thereto, and means for matching an impedance of the antenna and an impedance of the radio in response to the sensing signal, thereby making an optimal matching of impedances between the antenna and the radio according to the states of the folder casings and the antenna, and according to the transmission/reception mode.
192 Citations
17 Claims
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1. 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:
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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. - View Dependent Claims (2, 3, 4)
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5. A device for matching an antenna impedance in a portable radio telephone having 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 and a retracted position, the device comprising:
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means for sensing the position of the foldable casing and the antenna, and for providing a sensing signal in response thereto;
means for determining optimal antenna impedance values where each value corresponds with a different radio telephone configuration based on the position of the foldable casing and the antenna and whether the portable radio telephone is transmitting or receiving;
means for storing a voltage corresponding to each of the optimal antenna impedance values; and
means for matching the antenna impedance based on the sensing signal and a stored voltage corresponding to the sensed position of the foldable casing and the antenna. - View Dependent Claims (6, 7, 8, 9, 10)
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11. A method of adjusting an antenna impedance in a portable radio telephone that includes transmission and receive circuits, a foldable casing enclosing the radio, 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, said method comprising the steps of:
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sensing a configuration of the radio telephone, wherein the configuration is defined by the position of the foldable casing, the position of the antenna and whether the radio telephone is in transmit or receive mode, and providing a sensing signal in response thereto;
measuring a reception/transmission signal strength at a radio frequency for each of a plurality of antenna impedances and for each of a plurality of radio telephone configurations;
determining an optimal antenna impedance for each configuration;
storing a voltage corresponding to the optimal antenna impedance for each configuration; and
setting the antenna impedance based on the stored voltage, according to the sensing signal provided in response to the sensed radio telephone configuration. - View Dependent Claims (12, 13)
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14. A method for matching an antenna impedance in a portable radio telephone that includes a radio having transmission and receiving circuits, a foldable case enclosing the radio, the foldable case movable between an unfolded position and a folded position, and an antenna movable between an extracted position from the foldable case and a retracted position into the foldable case, said method comprising the steps of:
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storing a plurality of values;
sensing whether the antenna is in the extracted position in transmitting or receiving mode and producing at least one sensing signal in response thereto;
selecting one of the plurality of values that corresponds with the sensing signal; and
matching an the antenna impedance in response to the selected value, wherein the matched impedance corresponds with the impedance of the transmission or receiving circuit.
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15. A device for matching antenna impedance in a radio telephone that includes a foldable case, said device comprising:
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memory for storing a plurality of digital values, each associated with a corresponding telephone configuration, wherein the configuration is defined by the position of the case, the position of the antenna and whether the telephone is transmitting or receiving;
means for sensing the configuration;
means for generating a sensing signal that reflects the sensed configuration; and
means for matching the antenna impedance based on a selected one of the stored digital values that corresponds with the sensing signal. - View Dependent Claims (16, 17)
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Specification