The NFC Antenna plays a major role in the design of every NFC Reader and NFC Tag.
Essentially, it consists of a wire that generates a magnetic field through alternating current flow, a principle known as Ampere's law. By coiling the wire, we can enhance the strength of the magnetic field. See below for more details.
Where:
I - Current
H - Magnetic Field
Conversely, an alternating magnetic field passing through the NFC Antenna induces an alternating current. See the illustration below for clarification:
Where:
I - Current
U - Voltage
H - Magnetic Field
The magnitude of the magnetic field emitted by the NFC Antenna is determined by both its mechanical parameters (such as effective size, number of turns, track width, and track gap) and electrical parameters (including inductance, resistance, and quality factor). Additionally, the input antenna current and the surrounding antenna environment also play crucial roles in influencing the emitted magnetic field.
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