Full-wave analysis of discontinuities in planar waveguides by the method of lines using a source approach
Abstract
An accurate full-wave analysis of discontinuities in shielded microwave structures by the method of lines is presented for use in microwave IC design.. The input currents are derived from a sinusoidal source representation and modeled by inhomogeneous boundary conditions (to account for the excitation). Interacting discontinuities can be treated without segmentation. Analysis shows that in discretizing the differential operators additional source terms which result in inhomogeneous differential equations are obtained. A deterministic equation for the current distribution is derived. For higher flexibility, nonequidistant discretization is used. The scattering parameters are presented for the microstrip step discontinuity and for a single-filter structure with interacting discontinuities, namely a coupled line filter. Experimental measurements verify the filter calculations.
- Publication:
-
IEEE Transactions on Microwave Theory Techniques
- Pub Date:
- October 1990
- DOI:
- 10.1109/22.58693
- Bibcode:
- 1990ITMTT..38.1510W
- Keywords:
-
- Current Distribution;
- Microstrip Devices;
- Microwave Circuits;
- Planar Structures;
- Boundary Conditions;
- Discontinuity;
- Inhomogeneity;
- Integrated Circuits;
- Spatial Filtering;
- Electronics and Electrical Engineering