In electronics, capacitive coupling is the transfer of energy from lightning capacitive coupling one circuit to another by means of the mutual capacitance between the circuits. This can be an intentional or accidental effect. It only works well enough to be of practical use in relatively short ranges, such as some RFID applications.
Capacitive coupling favors transfer of the higher frequency components of a signal, whereas inductive coupling favors lower frequency components, and conductive coupling favors neither higher nor lower frequency components.
"Gimmick" is the name of a very simple kind of capacitive coupling. All it is is a piece of wire that is attached to another one, not connected, but the insulation of both is in-between, providing a capacitive coupling between the two circuits, just a very few Picofarads in value. Maybe there are several turns of wire, capacitive inductive common impedance coupling as required.
References
Some of the information in this entry taken from Federal Standard 1037C and from MIL-STD-188.
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Electronics Topics
The field of electronics is the study and use of systems that operate by controlling the flow of electrons or other electrically charged particles in devices such as thermionic valves and semiconductors. The design and construction of electronic circuits to solve practical problems is part of the fields of electronic engineering, and the hardware design side of computer engineering. The study of new semiconductor devices and their technology is sometimes considered as a branch of physics.
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