![]() In sinusoidal steady-state Equations (4a) and (4b) become ![]() Thus,įor arbitrary time variations, in any medium, equations (2a) and (2b) lead to the (uniform plane) wave equations Uniformity assumption, combined with Equations (1) and (2a) reveals the fact that the H field is perpendicular to the E field in the plane and is pointing in the +y direction, as shown in Figure 1. Since the uniform plane wave is an electromagnetic wave, it must satisfy the Maxwell’s curl equations, which for the source-free media, in time domain, are given by It is customary to have the E field point in the positive x direction, as shown in Figure 1. Such a wave, propagating in the +z direction, is shown in Figure 1. The term uniform means that E and H vectors do not depend on the location within each plane i.e., the have the same amplitudes and directions over the entire plane. The term plane means that the E and H vectors associated with the wave lie in a plane and as the wave propagates the planes defined by these vectors are parallel. Both descriptors in the name: uniform and plane are very important. Let’s begin with the concept of a uniform plane wave. ![]() Finally, two important EMC applications of the skin depth concept are explained: (1) shielding using metallic conductors, and (2) current density Subsequently, the skin depth definition is presented and applied to good conductors. In order to explain this concept, we begin with the uniform plane propagation, leading to the wave equations and their solutions in different media. T his tutorial article focuses on the skin depth phenomenon in good conductors. ![]()
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