Dual Impedance

Dual Impedance

Dual impedance and dual network are terms used in electronic network analysis. The dual of an impedance is its algebraic inverse . Note that and are the duals of each other, that is, they are reciprocal. For this reason the dual impedance is also called the inverse impedance. The dual of a network of impedances is that network whose impedance is . In the case of a network with more than one port the impedance looking into each of the ports must simultaneously be dual.

Another way of stating this is that the dual of is the admittance .

This is consistent with the definition of dual as being that circuit whose voltages and currents are interchanged since and

Parts of this article or section rely on the reader's knowledge of the complex impedance representation of capacitors and inductors and on knowledge of the frequency domain representation of signals.

Read more about Dual ImpedanceScaled and Normalised Duals, Duals of Basic Circuit Elements, Graphical Method

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... It can now be seen that the dual of a Cauer low-pass filter is still a Cauer low-pass filter ...

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