Puneet Varma (Editor)

Coupling (electronics)

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In electronics and telecommunication, coupling is the desirable or undesirable transfer of energy from one medium, such as a metallic wire or an optical fiber, to another medium.

Coupling is also the transfer of electrical energy from one circuit segment to another. For example, energy is transferred from a power source to an electrical load by means of conductive coupling, which may be either resistive or hard-wire.  An AC potential may be transferred from one circuit segment to another having a DC potential by use of a capacitor.  Electrical energy may be transferred from one circuit segment to another segment with different impedance by use of a transformer. This is known as impedance matching. These are examples of electrostatic and electrodynamic inductive coupling.

Types of coupling

Electrical conduction:

  • hard-wire
  • resistive
  • natural conductor
  • Electromagnetic induction:

  • electrodynamic -- commonly called inductive coupling, also magnetic coupling
  • electrostatic -- commonly called capacitive coupling
  • evanescent wave coupling
  • Electromagnetic radiation:

  • radio -- wireless telecommunications
  • electromagnetic interference (EMI) -- Sometimes called radio frequency interference (RFI), is unwanted coupling. Electromagnetic compatibility (EMC) requires techniques to avoid such unwanted coupling, such as electromagnetic shielding.
  • Microwave power transmission
  • Other kinds of energy coupling:

  • acoustic
  • References

    Coupling (electronics) Wikipedia