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They are passive components whose capacitance can be changed by means of a control voltage.
The capacitance value of a variable capacitor is altered by applying a voltage. By making use of this property, optimum characteristics can be obtained in circuits with tight tolerance requirements by adjusting the applied voltage.
If you are looking for tight tolerance capacitors, definitely consider using variable capacitors.
Frequency deviation is resolved by applying the appropriate voltage.
Use in the antenna matching circuit to adjust the resonant frequency.
During design:The resonant frequency deviates from the desired frequency due to the parts tolerance needed to match the antenna tolerance.
Objective:VAC can be used in the antenna matching circuit to enable adjustment of the resonant frequency.
Smartphone, mPOS Terminal, NFC Door Reader, NFC Vending Machine, Payment Ring...etc.
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