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Updating Circuit Theory: The Virtual Conductor

Series

By Ian Darney

A circuit model is developed to simulate the emission from a twin conductor cable. Antenna-mode current flows out into a virtual conductor.

Three of the building blocks of all circuit models are the primitive inductance, the primitive capacitance, and the series resistance. The primitive inductance relates the energy level of the magnetic field caused by current in a conductor to the voltage developed along that conductor. The primitive capacitance relates the voltage on the surface of a conductor to the electric field. The series resistor relates the current and voltage along a conductor to the power loss due to thermal effects.

The fourth building block is the radiation resistance. This simulates the power loss due to current flowing out into the environment.

This article brings all four parameters together in the form of a simple network.

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