Gradient optimization of microwave devices using continuum design sensitivities from the adjoint problem

Design sensitivities for microwave problems derived in continuum form are applied to the shape and material parameters optimization. In particular, we optimize several scatterers' radar cross section (RCS) and a T-junction's reflection coefficient. The optimizations converge, in a small number of iterations, to designs of highly improved performance. Both frequency- and time-domain electromagnetic field solvers are tested and compared for the optimization of RCS.