Slovník pojmů

Boundary conditions

Boundary conditions are met by the electromagnetic field on the boundary of two different media. For the component of E , which is tangential to the boundary, we write: E_tang 1 = E_tang 2. Both the intensities are measured in points, which are located near the boundary on different sides. For normal components of electric displacement vector, we in analogy get: D_norm 1 = D_norm 2. Dealing with magnetic field, tangential components of H and normal components of B have to meet similar conditions.

If one medium is perfectly conductive for electric currents or magnetic ones, boundary conditions can be divided to Dirichlet condition and to Neumann one.

Dirichlet condition expresses the fact that the component of electric (magnetic) field intensity, which is tangential to the perfect electric (magnetic) conductor, has to be zero

Neumann condition expresses the fact that derivative of the electric (magnetic) field intensity vector in the normal direction to the perfect magnetic (electric) conductor has to be zero

PEC denotes Perfect Electric Conductor, PMC denotes Perfect Magnetic Conductor and n is a normal to the conductive surface.