Question

Electromagnetic Waves: Explain Surface Impedance in conductors and deduce expression for it

Answer 1

For a ideal conductor the electromagnetic field is zero but for a practical conductor the electric field E_t and then magnetic field acts tangentially as H_t. Thus the field extended by conductor but the decreases with distance thus to maintain the field that must be distributed in conductor . In which the impedence provides the field outside the conductor by Z_s= E_t/H_t it provides the boundary condition for field outside the conductor.

In general the impedence of conductor is sum of resistance and complex inductance.The impedence expressed as maxwell equation as shown in following,