Realization of generalized soft-and-hard boundary

The classical soft-and-hard surface boundary conditions have previously been generalized to the form a center dot E = 0 and b center dot H = 0 where a and b are two complex vectors tangential to the boundary. A realization for such a boundary is studied in terms of a slab of special wave-guiding anisotropic material. It is shown that analytic expressions can be found for the material parameters and thickness of the slab as functions of the complex vectors a and b. Application of a generalized soft-and-hard boundary as a polarization transformer is studied in detail.