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UBC Theses and Dissertations
Application of the iterative moment method for dielectric scattering calculations Huang, Xiaomin
Abstract
In this thesis, the calculation of the electromagnetics(EM) scattering of three dimensional, irregular, inhomogeneous and lossy dielectric objects is discussed. The iterative moment method (MM) which can solve problems involving a large number of unknowns than the conventional MM is used. For result comparison and checking, conventional MM is discussed too. Generally, the method also applies for any arbitrarily shaped penetrable body with arbitrary dielectric distributions which will have importance in communication, medical, biological, meterological and military studies. A new melting-snow particle model is presented in this thesis, based on physical observations or assumptions. The EM scattering cross-sections of the new melting-snow model are evaluated at certain frequencies, melting factors and rain rates by the iterative MM. The analyses of the new model give us a better understanding to the EM scattering property of melting snow particles at the early stage and to the effect of outer layer water distributions on the scattering of melting snow. The results obtained are compared with those of two other existing models. The comparison shows that the different melting snow particle models have different scattering properties; the different melting water distributions assumed significantly affect the scattered fields. The validity of the iterative MM for large number of unknowns has been shown. The numerical calculation examples in this thesis prove the equivalence of the two moment methods at special choice of basis functions and weighting functions. The thesis also discusses the computer realization of the two moment methods, compares their advantages and disadvantages. Conclusions regarding the choice of subcell size and the initial guess, the convergence and precision, computer memory, and computing time are obtained which will have academic interests.
Item Metadata
Title |
Application of the iterative moment method for dielectric scattering calculations
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Creator | |
Publisher |
University of British Columbia
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Date Issued |
1994
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Description |
In this thesis, the calculation of the electromagnetics(EM) scattering of three
dimensional, irregular, inhomogeneous and lossy dielectric objects is discussed. The
iterative moment method (MM) which can solve problems involving a large number
of unknowns than the conventional MM is used. For result comparison and checking,
conventional MM is discussed too. Generally, the method also applies for any
arbitrarily shaped penetrable body with arbitrary dielectric distributions which will
have importance in communication, medical, biological, meterological and military
studies.
A new melting-snow particle model is presented in this thesis, based on
physical observations or assumptions. The EM scattering cross-sections of the new
melting-snow model are evaluated at certain frequencies, melting factors and rain
rates by the iterative MM. The analyses of the new model give us a better
understanding to the EM scattering property of melting snow particles at the early
stage and to the effect of outer layer water distributions on the scattering of melting
snow. The results obtained are compared with those of two other existing models.
The comparison shows that the different melting snow particle models have different
scattering properties; the different melting water distributions assumed significantly
affect the scattered fields.
The validity of the iterative MM for large number of unknowns has been
shown. The numerical calculation examples in this thesis prove the equivalence of the two moment methods at special choice of basis functions and weighting functions.
The thesis also discusses the computer realization of the two moment methods,
compares their advantages and disadvantages. Conclusions regarding the choice of
subcell size and the initial guess, the convergence and precision, computer memory,
and computing time are obtained which will have academic interests.
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Extent |
1521997 bytes
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Genre | |
Type | |
File Format |
application/pdf
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Language |
eng
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Date Available |
2009-02-26
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Provider |
Vancouver : University of British Columbia Library
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Rights |
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
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DOI |
10.14288/1.0065188
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URI | |
Degree | |
Program | |
Affiliation | |
Degree Grantor |
University of British Columbia
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Graduation Date |
1994-05
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Campus | |
Scholarly Level |
Graduate
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Aggregated Source Repository |
DSpace
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Item Media
Item Citations and Data
Rights
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.