OPTIMIZATION OF A RIDGED WAVE-GUIDE

In industrial design, synthesizing a guide for a given cut-off frequen cy or attenuation limit is a challenging problem. In this paper, an al gorithm is applied for the quick computation of the gradients of the o bject function, without using the solution of two finite-element eigen value problems to compute the gradient of the object function with res pect to every parameter of description. It is shown that because of th e presence of deep valleys in the object function, the traditionally i nferior zeroth-order pattern search method performs better than the fi rst order conjugate gradient method.