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Method for calculating and observing microwave absorption by a sphere in a single mode rectangular cavityA new theory of microwave absorption by a lossy dielectric sphere in a single mode rectangular cavity has been recently developed. The absorption was treated in the framework of an electromagnetic scattering problem. That theory is summarized here and calculated results that bear on optimizing the processing of materials are illustrated. Methods for observing power absorption and other results predicted by the scattering model are discussed. Cavity perturbation theory provides a bridge between theoretical calculations and experimental observations, and a special problem that arises when an established version of cavity perturbation theory is applied to spheres is identified, analyzed, and resolved. The direct problem of predicting shifts in frequency and Q from model calculations is discussed for a sphere in a cavity when the sphere's complex dielectric constant is known. Also, the inverse problem of determining the complex dielectric constants from measured values of those shifts is considered. The small sphere limit, where an electrostatic or quasistatic model is valid, is treated in detail, and planned work on parallel problems for larger spheres is described.
Document ID
19930053022
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Jackson, H. W.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Barmatz, M.
(JPL Pasadena, CA, United States)
Date Acquired
August 16, 2013
Publication Date
January 1, 1991
Publication Information
Publisher: American Ceramic Society, Inc. (Ceramic Transactions. Vol. 21)
Subject Category
Physics (General)
Accession Number
93A37019
Distribution Limits
Public
Copyright
Other

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