Antenna device
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United States of America Patent
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Jan 9, 2018
Grant Date -
Oct 26, 2017
app pub date -
Jul 11, 2017
filing date -
Mar 5, 2012
priority date (Note) -
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Abstract
A stray capacitance is generated between an antenna element and a ground electrode. A capacitance detection circuit detects the stray capacitance. An antenna matching circuit, is provided along a wireless communication signal path, which is a transmission path between the antenna element and a feeder circuit. A feedback control circuit transmits a control signal to the variable matching circuit on the basis of a detection result of the capacitance detection circuit in accordance with the stray capacitance. The capacitance detection circuit includes a constant current source and a timing circuit to measure the time taken to charge the antenna from the constant current source and for the voltage to reach a predetermined voltage.
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