Impedance matching apparatus in a mobile communication terminal
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United States of America Patent
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Issued Date -
Sep 8, 2005
app pub date -
Mar 4, 2005
filing date -
Mar 5, 2004
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
Disclosed is an impedance matching apparatus in a mobile communication terminal. More particularly, the present invention relates to an impedance matching apparatus which may provide good RF characteristics regardless of opening and closing of a cover of a mobile communication terminal, by sensing the opening and closing of a cover of a mobile communication terminal and maintaining impedances of an antenna and a radio transmitting and receiving unit of the mobile communication terminal at an optimum matching state. The impedance matching apparatus can maintain an optimum impedance matching state between an antenna and a radio transmitting and receiving unit of a mobile communication terminal regardless of opening and closing of the cover, because it comprises two impedance matching circuits having different values of impedance. Meanwhile, the impedance matching apparatus may comprise two antennas having different values of impedance in addition to the two impedance matching circuits.
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