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## Saturday, September 22, 2012

### Inductive Coupling De-simplified: NFC Antenna

For a long time we wondered how does inductive coupling works. It not until recently that we had a revelations:
```Φ = v / ω
Where,
v – AC Voltage applied to the Coil
[volt = Joules/Coulomb = kg.m²/(Ampere . second³)]
ω – Angular Frequency [radians/second]
Φ - Magnetic Flux(Instantaneous)
[Weber = Joule . Second / Coulomb = Joule / Ampere =
kg.m²/(Ampere . second²)]
```

This is a very important relationship that shows how magnetic coupling really behaves. Taking it from this result we have the following conclusions:
1. As the Angular Frequency decreases (ω = 2.π.freq) Flux increases
2. As AC voltage applied increases then Flux increases
Hence this principle can be used for a wide variety of applications such as:
• RF-ID Antenna
• Inductive Charging
• NFC
Well we will now tell you how we came to this equation finally. Thanks to Mr. Francois Pichon for explaining us in such intricate details of this phenomenon.