In this thesis a numerical technique to model general microstrip asymmetric and
multiple step discontinuities is presented. The method is based on a magnetic wall
waveguide model that is assumed to be valid for describing the electromagnetic fields
associated with the microstrip line and in the vicinity of microstrip discontinuities.
The fields are expanded in the uniform regions and the mode-matching method is
applied at the discontinuities to analyze for the frequency dependent transmission
properties of the multi ports. The generalized scattering matrix technique is used to
model cascaded interacting discontinuities and is used to compute the properties of
double-step and multi port structures. The generalized scattering matrix formulation
takes into account the scattering phenomena of the dominant and all of the higher-order
modes including evanescent ones.
The validity of this model has been discussed extensively, and it is shown that the
model can be used to describe the microstrip discontinuities with acceptable
accuracy. The technique is applied (1) to study the transmission characteristics of
asymmetric step discontinuities; (2) to design a filter for a desired frequency range
using interacting asymmetric double step micros trip line; and (3) to design a new
nominal 3db power devider of large bandwidth consisting of a three port rectangular
patch. The techniques and models presented can be used in computer-aided analysis
and design of such circuits. / Graduation date: 1993
| Identifer | oai:union.ndltd.org:ORGSU/oai:ir.library.oregonstate.edu:1957/37120 |
| Date | 31 July 1992 |
| Creators | Kapoor, Sunil |
| Contributors | Tripathi, Vijai K. |
| Source Sets | Oregon State University |
| Language | en_US |
| Detected Language | English |
| Type | Thesis/Dissertation |
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