Variable CapacitorsMerits of using VAC for NFC

Use in the antenna matching circuit to adjust the resonant frequency.

Why use variable capacitors (VAC)?

  • The variable capacitor absorbs the antenna L value variance for easier f0 adjustment!
  • Easier debugging during certification tests.
  • Easier variance adjustment when building into cases.

Merits of using variable capacitors (VAC)

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.

Examples of application

Smartphone、mPOS Terminal、NFC Door Reader、NFC Vending Machine...etc.

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