Connection between Circuits or Coupling
In a radio frequency identification system, the inductance circuit can be coupled. It is this inductance coupling principle that is commonly employed in tags. Nevertheless, capacitive and radiative or backscatter coupling may also be used.
Resonance
The dimensions of the inductance circuit determine its natural frequency limits which are in turn dependent on its stored energy. The stored energy which is in the form of electrical charges is capable of movement within the circuit creating a situation called resonance or back and forth motion of positive and negative charges from one circuit to another and back. The incidence of motion of charges is in itself the radio frequency capable of working with an antenna.
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