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Near-field magnetic induction is the transfer of energy or information through changing magnetic flux between nearby circuits, usually coils. Alternating current in a transmitting coil creates a changing magnetic field; when some of that field passes through a nearby receiving coil, it induces a voltage there.
How does magnetic induction work between coils?
- The transmitter creates a changing field. Alternating current through a coil produces a magnetic field that changes over time.
- Some magnetic flux reaches the receiver. The transmitter and receiver’s shapes, spacing, orientation, and circuit design affect how much field links the coils.
- The changing flux induces voltage. A changing magnetic field through the receiver coil produces an electromotive force, or voltage, in that circuit.
- The receiver uses the signal. Its circuit can use the induced electrical energy to power a load, or detect changes in the field to receive information.
Engineers describe the strength of the coil-to-coil link using mutual inductance and a coupling coefficient. Resonant inductive systems tune the transmitter and receiver circuits to a common resonant frequency, which can support the transfer. The details depend on the system design; induction alone does not specify a particular range or performance level. A review of inductive coupling for wireless power transfer and near-field communication discusses these uses.
What does “near field” mean here?
“Near field” describes a technical relationship between a source and the surrounding electromagnetic field, not one universal distance cutoff. The applicable convention depends on the frequency, antenna or coil, and purpose of the analysis. For example, the IEC wireless-power glossary includes an application-specific “short-range near-field” definition based on coil spacing relative to coil radii; it should not be treated as a boundary for every near-field system. IEC 63006:2019 provides that glossary context.
In magnetic induction, the useful link is primarily local coupling through magnetic flux between circuits. Far-field transmission instead carries energy as radiated electromagnetic waves. The distinction is about the dominant coupling mechanism, not a simple claim that one system radiates nothing or that all systems switch modes at the same distance. An IEEE article on near-field communications discusses the distinction between near- and far-field approaches.
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How is magnetic induction different from capacitive coupling?
Both are near-field coupling methods, but they use different parts of the electromagnetic field and different structures.
| Method | Field doing the coupling | Typical interface | Common use |
|---|---|---|---|
| Magnetic induction | Changing magnetic field | Coils | Inductive wireless power transfer and magnetic-induction communication |
| Capacitive coupling | Electric field | Electrodes or plates | Capacitive wireless power transfer |
| Far-field transmission | Radiated electromagnetic waves | Antennas | Wireless transmission over distances suited to the system |
These are broad distinctions, not complete descriptions of every design. The National Academies describes inductive systems as coil-to-coil magnetic coupling and capacitive systems as plate-to-plate electric coupling in its overview of wireless power transfer. National Academies, Frontiers of Engineering (2017).
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Where is near-field magnetic induction used?
Wireless charging
Inductive wireless power transfer uses magnetic coupling between transmitting and receiving coils. Handheld-device charging and stationary electric-vehicle charging are documented examples. A charging pad is one familiar illustration: its coil creates a changing field that can induce voltage in a compatible device’s receiving coil. Not every system described as wireless charging necessarily uses the same design.
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Near-field magnetic-induction communication uses coupled coils to carry information. A transmitter can modulate the magnetic signal, and a receiving circuit can detect those changes. Resonant coils may be used, but protocols and system designs vary. Magnetic induction is therefore a mechanism, not a synonym for any one wireless standard.
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Other research applications
Near-field electromagnetic induction has also been studied in applications including tomography, communication, and wireless power transfer. A peer-reviewed article on near-field electromagnetic induction discusses examples of this research.
Is near-field magnetic induction the same as NFC?
No. Magnetic induction is a physical coupling mechanism; NFC is a communication technology with its own protocol and system design. Technologies can share inductive coupling without being interchangeable. Similarly, wireless charging and short-range data communication can both use magnetic coupling while serving different purposes and operating according to different designs.
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Does the term say whether a device is safe?
No. The coupling mechanism by itself does not establish whether a particular product or exposure is safe. Exposure assessment requires measurements and methods suited to the system and conditions. OSHA notes that the relationship between electric and magnetic fields in the near field can be complex, and both may need to be measured when characterizing exposure. OSHA’s electromagnetic-field memo describes this measurement consideration.
IEC/IEEE 63184:2025 specifies assessment methods for fields from stationary wireless power transfer systems over 3 kHz to 30 MHz, with a focus on inductive systems. Its scope describes an assessment method; it does not, on its own, establish the safety of a specific device or exposure.
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