Field impedance
Field impedance is a complex quantity that characterizes the ratio of the electric and magnetic fields in a space where an electromagnetic wave propagates. It depends on the properties of the medium, such as the dielectric permittivity, magnetic permeability, conductivity, and frequency of the wave. Field impedance can be expressed as the ratio of the magnitudes of the electric and magnetic field strengths, multiplied by the phase angle between them. Field impedance can also be written as a complex number, where the real part corresponds to the active impedance, and the imaginary part to the reactive impedance. It is an important parameter for analyzing the reflection, transmission, absorption, and scattering of electromagnetic waves.
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