EIGEN VALUE AND EIGEN VECTOR PERTURBATION AND ADAPTIVE MESH GENERATION IN THE ANALYSIS OF WAVE-GUIDES

This paper describes the use of adaptive mesh generation in the analysis of waveguide modes. Two types of adaptive schemes are described. Both schemes are extensions of the nodal perturbation scheme for the Poisson equation described previously. Under the first scheme, we examine the change in the eigenvalue of the mode we are interested in and repeatedly refine the mesh until the change is acceptable. This scheme gives us reliable results but is not as economic as the second. The second scheme examines the change in the normalized eigenvector from mesh cycle to mesh cycle and accordingly refines the mesh at selective Location where the change is unacceptably high. This procedure accurately extracts a particular mode of the guide at great economy. © 1990, IEEE. All rights reserved.