Hi
I am designing a small circular PCB with the following specifications. Due to size limitations, the antenna cannot exceed 9mm, which prevents me from achieving the recommended 4.8µH of inductance. Is it acceptable to compensate for this by increasing the matching capacitance?
Additionally, I have two other questions:
1. what is the recommended spacing for an NFC antenna from the edge of the PCB?
2. Also, which formula do you use to calculate the inductance Circular or spiral () since I get two different results.
Please let me know if you need additional information.
Thank you
| (mm) | |
| PCB Radios | 10.5 |
| N Turns | 3 |
| Space from Edge | 0.5 |
| Track Width | 0.28 |
| Spacing | 0.13 |
| First | 9.86 |
| Second | 9.45 |
| Third | 9.04 |
| Spiral L | 0.35uH |
| Circular L | 76nH |
