NFC Coil Antenna Design: From Calculation to Simulation & Measurement

Learn the complete end-to-end workflow for designing and validating an NFC coil antenna at 13.56 MHz. 📡

In this video, we walk through the design process for a square coil antenna, focusing on the two most critical parameters: Inductance (L) and Equivalent Series Resistance (ESR). We compare results across three essential stages—Theoretical Calculation, 3D EM Simulation, and Physical Hardware Measurement—to see how real-world factors impact performance.

What you’ll learn in this video: ✅ How to use online tools for initial parameter estimation. ✅ 3D EM Simulation using solvers to analyze S-parameters and Smith Charts. ✅ Physical verification using a Vector Network Analyzer (VNA). ✅ Why ESR varies between ideal simulations and physical prototypes.

Technical Specifications used in this demo:

Dimensions: 40x40mm

Turns: 3

Trace Width: 0.36mm

Operating Frequency: 13.56 MHz

Results Comparison:

Inductance (L): Consistent across all methods (0.94nH to 1.1nH).

ESR: Varied from 0.89Ω (Simulation) to 1.4Ω (Measurement) due to skin effect and contact resistance.

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