ANTENNA MATCHING APPARATUS AND METHODS
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United States of America Patent
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Issued Date -
Dec 20, 2012
app pub date -
Oct 15, 2010
filing date -
Oct 27, 2009
priority date (Note) -
Abandoned
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Abstract
Apparatus and methods for matching the antenna of a radio device. In one embodiment, a capacitive sensor is arranged in the antenna structure and configured to detect the electric changes in the surroundings of the antenna. The mismatch caused by a change is rectified by means of the signal proportional to the sensor capacitance. This capacitance and the frequency range currently in use are input variables of a control unit. The antenna impedance is adjusted by means of a reactive matching circuit, the component values of which can be selected from a relatively wide array of alternatives by way of change-over switches, which are located in the transverse branches of the matching circuit.
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