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Waveguide termination, the periodic arrangement of dielectric rods in air confines the incident wave to travel along the waveguide. At the termination, the energy in the wave is scattered in all directions. The amount of energy passing through the boundary, , is a measure of the effectiveness of the waveguide termination. The absorbing boundary condition approximates a boundary to free space.
(a) The unoptimized waveguide termination. The optimized waveguide termination for the optimization design domain with an element size of (b) and (c) , (d) and (e) binary filtered interpretation of (b) and (c). (f) Power incident upon the boundary vs. nondimensional frequency for the domains shown in (a)–(e), (g) and for the , , , and optimization domains, showing that the domain is the best area over which to optimize.
(a) and (b) Magnitude of electric field for the unoptimized waveguide termination and (c) and (d) for the optimized waveguide termination for of Fig. 2(b). (e) and (f) Magnitude of the local power of (c) and (d) in log scale.
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