A Coupled-Field Expansion Method for Single-Layer and Multilayer Planar Periodic Structures
Figure 3
Equivalent “waveguides” with Bloch periodic boundaries at four sides, opened at two ends; (a) excited by equivalent magnetic currents at ; (b) excited by equivalent magnetic currents at ; (c) excited by equivalent magnetic currents and their images at , ; (d) excited by equivalent magnetic currents and their images at and , where .
