Real Poynting vector - opracowanie

Real Poynting vector Because of its importance this vector E×H is called the Poynting Vector and is normally
in the time domain denoted by N.
N = E ×H . (7.14)
We note that at this stage the Poynting vector has been defined of terms real vectors
E and H; that those fields may be either steady or time varying, and the Poynting vector
is in general a time-varying quantity. For steady or time varying fields, the vector N can
contain a steady component and a fluctuating component. In a sinusoidal steady state
situation there are two components, one at d.c. and one at twice the operating frequency.
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