Spiral NFC Antenna Coil for Multi-Size Coupling

The NFC coil is divided into multiple discrete loops of different sizes (first loop, second loop, third loop) that can be independently activated. Each loop is optimized for coupling with specific reference size listeners, allowing the system to segment the coupling task across multiple specialized components rather than relying on a single general-purpose coil.

The NFC coil system is designed to perform multiple functions by incorporating loops of different sizes that can handle different reference size listeners (PICC-1, PICC-3, PICC-6). The controller selectively activates appropriate loops based on the detected listener size, making the system universally compatible across all reference sizes while maintaining optimized performance for each.

Rather than manufacturing multiple different coil assemblies, the patent segments a single coil structure into multiple loops that can be manufactured as one integrated component. This maintains manufacturing simplicity while enabling differentiated performance characteristics through the segmented loop structure.

The system dynamically selects which loops to activate based on the detected listener size. The controller adjusts the operational configuration in real-time, activating only the necessary loops for the current interaction scenario. This dynamic adaptation ensures consistent user experience across different tag sizes without requiring multiple static coil designs.