研究目的
To explore design guidelines for ferromagnetic films, specifically ferrite films, fabricated by additive manufacturing, and investigate their influence on the performance of NFC tags mounted on metal objects, providing guidelines for required permeability and thickness values.
研究成果
Magnetic shielding films with high relative permeability (>100) and thicknesses around 30-40 μm are required for efficient NFC tag operation on metal. Simulations and measurements show that permeability can be estimated from frequency shifts, and printed layers may need thicker films for realistic permeability values. This provides guidelines for designing printable ferromagnetic films for NFC applications on metallic surfaces.
研究不足
The study relies on simulations and limited measurements with specific commercial samples; permeability tolerances from manufacturers are +/-20%, which may affect accuracy. Additive manufacturing of high-permeability films at thin layers (e.g., <30 μm) is challenging and not fully demonstrated in practice.
1：Experimental Design and Method Selection:
The study used simulations in CST Microwave Studio to model NFC tags on ferrite films over metal, varying ferrite thickness and permeability, and compared with calculated inductances. Measurements were conducted using a Voyantic HF Tagformance system to validate simulations and estimate permeability of commercial ferrite films.
2：Sample Selection and Data Sources:
NFC tags with different coil turns (4 to 10) were modeled. Commercial ferrite film samples from TDK were used for measurements.
3：List of Experimental Equipment and Materials:
CST Microwave Studio software, Voyantic HF Tagformance system, TDK ferrite films (e.g., IFL series), NFC tags (e.g., Smartrac Circus), metal plates, polymer substrates.
4：Experimental Procedures and Operational Workflow:
Simulated tag coils on ferrite films with varying parameters; measured resonance frequencies and read ranges of tags on different ferrite films; compared simulated and measured data to estimate permeability.
5：Data Analysis Methods:
Used inductance calculations from design equations, parameter sweeps in simulations, and frequency shift analysis to determine permeability and thickness requirements.
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