Discussion in 'Wireless & RF Design' started by hayden, Jul 3, 2009.
can anyone tell me why signals are expressed as complex numbers even when "real signals"
Can you provide an example of a expression for a signal that prompted your question?
It is because the algebra of complex numbers accurately models the magnitude and phase behavior of real signals. We could call them AC signal vectors if that would make you feel better.
ElectroMagnetic (EM) waves consist of an electric and magnetic field. They are perpendicular to eachother. So if someone told you that the magnetic field is horizontal you could imply that the electrical field is vertical, and therefore it is a vertical antenna.
It is easier to manipulate complex numbers than vectors, thus they don't express signals in vectors (you can if you want).