An extended spectral domain approach and its applications to a class of quasiplanar structures

Abstract

An extended spectral domain approach is developed and used to analyze a class of complex quasiplanar transmission lines. The extended method offers several additional advantages such as the applicability to nonuniform cross-section geometries, easy derivation of Green's functions by a recursive algorithm, and use of only one set of basis functions for the calculation of two tangential electric field or current components in the spectral domain at an interface. The approach enables studies to be made of effects of mounting grooves, finite metallization thickness, substrate anisotropy, and multilayer media. To demonstrate the versatility and accuracy of the extended technique, computed propagation characteristics are presented for several representative examples, and are compared with available experimental data and results by other numerical methods. These examples include channelized and nonsymmetrically shielded coplanar waveguides, nonsymmetrically shielded and pedestal-supported suspended striplines, asymmetrical ferrite-loaded finlines, and inset dielectric guides. Since the edge singularity is taken into account in the choice of basis functions, this approach is also numerically efficient. © 1997 John Wiley & Sons, Inc. Int J Microwave Millimeter-Wave CAE7: 468–482, 1997.