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Type of Document Dissertation Author Hicks, Chris Wayne, URN etd-11022002-174527 Title Electromagnetic and Experimental Modeling of Waveguide-Based Spatial Power Combining Systems Degree PhD Graduate Program Electrical Engineering Advisory Committee
Advisor Name Title Michael B. Steer Committee Chair James W. Mink Committee Co-Chair Alexander B. Yakovlev Committee Member Lazzi Gianluca Committee Member Robert J. Nemanich Committee Member Keywords
- quasi-optical
- spatial power combining
- waveguide
- method of moments
Date of Defense 2002-10-26 Availability unrestricted Abstract HICKS, CHRIS WAYNE. Experimental and Electromagnetic Modeling of Waveguide-Based Spatial Power Combining Systems. (Under the direction of Michael B. Steer.)
Recent technological advancements and demands for high power
sources at microwave and millimeter-wave frequencies have
initiated extensive theoretical and experimental research in the
area of quasi-optical and spatial power combining. The work
described here was motivated by the necessity to develop a
modeling environment for the electromagnetic analysis of planar
quasi-optical and spatial power combining systems, in order to
understand physical fundamentals and provide a basis for the
design process. Two types of planar quasi-optical
(QO) and spatial power combining systems are investigated.
Propagation in a QO parallel plate system is investigated
with the aim of establishing the mode structure and
characteristics of the modes. Theoretical electromagnetic
properties of a Gauss-Hermite beammode expansion was developed,
and verified experimentally, for the prediction of the resonant
frequencies of the structure and beammodes dispersion behavior.
The system was designed, fabricated, tested, and showed good
agreement between the experimental and theoretical results. In
addition, a QO parallel-plate stripline-slot amplifier system was
designed, tested and compared to a QO open HDSBW amplifier system
with Vivaldi-type antennas. Experimental results verify that a QO
parallel-plate stripline-slot amplifier proposed in this
dissertation can be modeled using Gauss-Hermite beammodes.
A full-wave electromagnetic model is developed and
verified for a spatial power combining system consisting of
slotted rectangular waveguides coupled to a strip line. The
waveguide-based structure represents a portion of the planar QO
power combiner discussed above. The electromagnetic simulator is
developed to analyze the stripline-to-slot transitions in a
waveguide-based environment. The simulator is based on the method
of moments (MoM) technique to model a power combining array of
slotted waveguide modules coupled to a strip line. The simulator
uses Galerkin projection technique with piecewise sinusodial
testing and basis functions in the electric and magnetic surface
current density expansions. Electric and magnetic dyadic Green's
functions are developed for an infinite rectangular waveguide in
the form of partial expansions over the complete system of
eigenfunctions of a transverse Laplacian operator. Numerical
results are obtained and compared with a commercial microwave
simulator for a few representative slot-strip-slot spatial
power combining transitions and arrays.
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