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Proceedings Paper

Some computational techniques for modeling of testing parameters in microwave cavity resonators
Author(s): Julian P. Gomes; Nathan Ida; Jian-She Wang
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Paper Abstract

Microwave nondestructive testing of lossy dielectric materials involves one of two situations: either the test sample is illuminated and a signal representing the material condition is obtained, or the material is introduced into a cavity and the measurement is done on cavity parameters. In the first case, the major problem is calculating and identifying modes in the cavity and avoiding spurious solutions. The second requires solution in the open domain and is treated here by coupled boundary element/finite element approach. The two methods are used: one uses a rather standard edge element solution and scanning of frequency to detect resonance. The second formulation is based on curvilinear edge elements which avoids spurious modes. The edge finite elements allow accurate continuity of tangential components of the electric or magnetic field and therefore do not introduce parasitic eigenvalues into the system of equations. Examples of scattering by lossy dielectrics and of loaded cavity resonators are given. These include scattering cross section of bodies and propagation in composite materials.

Paper Details

Date Published: 14 September 1994
PDF: 7 pages
Proc. SPIE 2275, Advanced Microwave and Millimeter-Wave Detectors, (14 September 1994); doi: 10.1117/12.186735
Show Author Affiliations
Julian P. Gomes, Univ. of Akron (United States)
Nathan Ida, Univ. of Akron (United States)
Jian-She Wang, Swanson Analysis Systems, Inc. (United States)

Published in SPIE Proceedings Vol. 2275:
Advanced Microwave and Millimeter-Wave Detectors
Satish S. Udpa; Hsiu C. Han, Editor(s)

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