E. Drake

Effect of substrate dielectric anisotropy on the frequency behavior of microstrip circuits

In this paper, we carry out a full-wave analysis of shielded two-port microstrip circuits, in which the metallizations are embedded in a multilayered substrate that may contain isotropic dielectrics and/or anisotropic dielectrics. The Galerkins method in the spectral domain is applied for determining the current density on the metallizations of the circuits when their feeding lines are excited by means of delta-gap generators, and the matrix pencil technique is subsequently used for deembedding the scattering parameters from the computed current densities. Results are presented for the scattering parameters of some microstrip discontinuities and filters printed on both isotropic dielectric substrates and anisotropic dielectric substrates. These results show that when substrate dielectric anisotropy is ignored, errors arise when computing the scattering parameters of microstrip discontinuities and when predicting the operating frequency band of microstrip filters.

Quick computation of [C] and [L] matrices of generalized multiconductor coplanar waveguide transmission lines

An enhanced spectral domain quasi-TEM analysis of generalized coplanar waveguide transmission lines (GCPWTL) is presented. The analysis starts from the formulation of a convolution-type integral equation for the electric field at the slots. Chebyshev polynomials including Maxwell singularities are used as basis functions to solve the integral equation by the Galerkin method. Fast and accurate quasi-analytical formulas are used to calculate the Galerkins matrix entries, thereby significantly reducing the involved CPU time and increasing reliability and accuracy. These features make this technique useful and competitive as CAD tool for coplanar waveguide designs. >

An improved iterative technique for the quasi-TEM analysis of generalized planar lines

The generalized bioconjugate gradient method (GBGM) and fast Fourier transform (FFT) algorithm are used for the quasi-transverse electromagnetic (TEM) analysis of generalized multistrip lines embedded in multilayered lossless/lossy, iso/anisotropic dielectric and/or magnetic media. Important computational improvement is achieved by including asymptotic extraction techniques in the determination of the spatial Greens function matrix. Comparisons with other iterative procedures are presented. Several practical structures are analyzed and numerical results are compared with previously published data. >

Improved quasi-static and full-wave analysis of the general boxed coplanar waveguide

In this work we present an efficient quasi-analytical method to compute the characteristic parameters of the symmetric coplanar waveguide (CPW) embedded in a layered iso/anisotropic medium. The method is first developed in the frame of the quasi-TEM approach and leads to extremely quick and accurate computer codes. Next, it is extended in order to speed up full-wave spectral domain analysis (SDA) computations of the propagation constant and characteristic impedance. A systematic zero searching strategy is used. This gives place to an accurate, quick and reliable full-wave code.