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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 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Coupling (electronics)」の詳細全文を読む スポンサード リンク
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