Variable capacitance element, packaged circuit, resonant circuit, communication apparatus, communication system, wireless charging system, power supply apparatus, and electronic apparatus
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United States of America Patent
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Feb 5, 2019
Grant Date -
Aug 27, 2015
app pub date -
Jul 29, 2013
filing date -
Aug 9, 2012
priority date (Note) -
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Abstract
The present provides a variable capacitance element enabling a further reduction in capacitance variation among variable capacitance elements, and provides a packaged circuit including the variable capacitance element. A variable capacitance element is configured to include an element body unit, a compensation unit, a first external terminal for signals, a second external terminal for signals, external terminals for control, and external terminals for capacitance compensation. The compensation unit has second variable-capacitance capacitor units C9 to C 11, each including a second dielectric layer formed of a ferroelectric material, and is connected to the element body unit, and has a capacitance varying according to a control voltage signal.
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