Reference Table: Measured Sensing Distances for Various NFC Tag Types

The data below represents the average measured values ​​obtained using standard smartphones (e.g., iPhone 15 or Samsung S23) in an open-air environment:

3 Key Factors Influencing Sensing Distance

1.Antenna Size: This is the most critical influencing factor. According to the principles of electromagnetic induction, the larger the antenna surface area, the greater its capacity to capture magnetic field energy from the reader, resulting in a longer sensing distance. This explains why the sensing performance of PVC cards is typically superior to that of 15mm mini stickers.

2.Reader Power: The NFC output power of standard smartphones is relatively low. If you utilize an industrial-grade, high-power NFC reader, the sensing distance for the aforementioned tags can typically be increased by 20% to 50%.

3.Installation Environment (Surroundings):

• Metal Interference: If a standard tag is affixed to a metal surface, the reading distance will drop to zero. The use of anti-metal tags can restore signal functionality, though the reading distance will remain slightly shorter than in a standard, metal-free environment.
• Liquid Interference: If a tag is affixed to a container filled with liquid (such as a water bottle), the liquid will exert a certain degree of absorption effect on the high-frequency signals.

Technical Appendix: Explanation of NFC Tag Sensing Distance Test Environment (Test Environment Setup)

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