Adaptive antenna tuning based on measured antenna impedance
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United States of America Patent
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Dec 18, 2018
Grant Date -
Mar 15, 2018
app pub date -
Nov 17, 2017
filing date -
Jun 12, 2014
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A system includes an antenna, an impedance measurement circuit, an impedance tuning circuit, and a controller. The impedance measurement circuit can include a test current source that conveys a test current through the antenna, and a voltage sensor that measure a voltage across the antenna while the test current is conveyed through the antenna. The impedance tuning circuit can be coupled to the antenna leads and can include one or more reactive elements that can be selectively coupled to the antenna, or otherwise adjusted, to effect adjustment of the impedance connected to the antenna. The controller can: (i) use the impedance measurement circuit to obtain a measurement indicative of an impedance of the antenna; (ii) determine an adjustment to the impedance tuning circuit based on the obtained measurement; and (iii) cause the impedance tuning circuit to make the determined adjustment.
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