The general expressions for finding the network functions, e.g.,
the immittance and the scattering parameters, of a general, uniformly
coupled n-line structure in an inhomogeneous medium are derived in
terms of the normal mode parameters of the system. These are used to
compute or to derive the explicit expressions for the elements of the
immittance matrix in terms of normal mode parameters.
The scattering parameters of a general non-symmetrical directional
coupler with arbitrary terminations are derived in terms of the
known scattering parameters with a specified set of terminations such
as characteristic non-mode converting terminations. The formulation
is quite general and can be applied to various coupled guided wave
systems, including coupled microstrip lines, slot lines, comb lines,
dielectric waveguides and various other uniformly coupled transmission
systems.
The results obtained are used to present the procedure to determine
the optimum terminations for directional couplers and sensitivity
of various multiports, including couplers, to changes in terminations.
It is shown that the coupler performance can be optimized in
terms of the terminating impedances.
The analysis and design procedure for both symmetrical and nonsymmetrical
four-port coupled structures consisting of the symmetrical
three lines in an inhomogeneous medium such as microstrips are presented.
Tables and charts for the design of three-line structure are
based on the closed form expressions for the immittance parameters.
The analysis and design procedure for open-circuited interdigital
multiple coupled microstrip line structures for applications as wideband
DC blocks and filters are also presented. As in the case of the
other microstrip structures, the initial design is based on the TEM
assumption and the final geometry is then determined by the exact computation
of the frequency response of the two ports. For larger numbers
of lines, the design is based on the equivalent even- and odd-mode
parameters of the n-line system. For this case, the TEM design
equations, derived in terms of even- and odd-mode impedances of a
pair of lines, can be translated into a physical configuration by
using published results on coupled lines. / Graduation date: 1983
| Identifer | oai:union.ndltd.org:ORGSU/oai:ir.library.oregonstate.edu:1957/31148 |
| Date | 21 May 1982 |
| Creators | Chin, Youn Kang |
| Contributors | Tripathi, Vijai K. |
| Source Sets | Oregon State University |
| Language | en_US |
| Detected Language | English |
| Type | Thesis/Dissertation |
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