Closed loop antenna tuning system
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United States of America Patent
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Mar 4, 2003
Grant Date -
Jun 27, 2002
app pub date -
Dec 26, 2000
filing date -
Dec 26, 2000
priority date (Note) -
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Abstract
A tunable resonant system includes an electric element, and a core having a controllable parameter that determines the resonant frequency of the system. In order to tune the resonant system to a desired frequency, a low power, narrowband signal is applied at a selected frequency to the electric element. The reflected or transmitted power is measured and the value of the controllable parameter adjusted to vary the resonant frequency of the system in a closed loop until the reflected power is at a minimum.
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