Inductive coupling

related topics
{system, computer, user}
{acid, form, water}
{math, energy, light}
{service, military, aircraft}

In electrical engineering, two conductors are referred to as mutual-inductively coupled or magnetically coupled [1] when they are configured such that change in current flow through one wire induces a voltage across the ends of the other wire through electromagnetic induction. The amount of inductive coupling between two conductors is measured by their mutual inductance.

The coupling between two wires can be increased by winding them into coils and placing them close together on a common axis, so the magnetic field of one coil passes through the other coil. The two coils may be physically contained in a single unit, as in the primary and secondary sides of a transformer, or may be separated. Coupling may be intentional or unintentional.

Unintentional coupling is called cross-talk, and is a form of electromagnetic interference. Inductive coupling favors low frequency energy sources. High frequency energy sources generally use capacitive coupling.

An inductively coupled transponder comprises an electronic data carrying device, usually a single microchip, and a large coil that functions as an antenna. Inductively coupled transponders are almost always operated passively.

Uses

Devices that use inductive coupling include:

Low frequency induction

Low frequency induction is an unwanted form of inductive coupling, which can occur when a metallic pipeline is installed parallel to a high-voltage power line. The pipeline, which is a conductor, and is insulated from the earth by its protective coating, can develop voltages which are hazardous to personnel operating valves or otherwise contacting the pipeline.

References

Full article ▸

related documents
Bitstream
Preemphasis
56 kbit/s line
Digital Signal 0
MD Data
PC motherboard
Communications in Germany
DECSYSTEM-20
KOffice
Jam signal
Shorten
Internet backbone
Multi-user
32-bit
BearShare
Frequency frogging
Amiga 2000
NSAP address
PagePlus
AbiWord
Intel 80486DX4
Carrier wave
Optical power budget
Proxy ARP
MOS Technology 6507
Viewdata
Memory hierarchy
Microassembler
PC-FX
Delta modulation