Microwave absorption by a lossy dielectric sphere in a rectangular cavity
作者:
H. W. Jackson,
M. Barmatz,
期刊:
Journal of Applied Physics
(AIP Available online 1991)
卷期:
Volume 70,
issue 10
页码: 5193-5204
ISSN:0021-8979
年代: 1991
DOI:10.1063/1.350227
出版商: AIP
数据来源: AIP
摘要:
A new theory of absorption of microwave power by a lossy dielectric sphere in a resonant rectangular chamber is developed here. In this treatment, resonant modes of the cavity are resolved into traveling plane‐wave fields, and Mie’s theory of scattering and absorption of a plane electromagnetic wave by a sphere is utilized. The fields in the cavity containing the sphere are found by superposition of results for the individual scattering problem for each traveling plane wave. Absorbed power is then calculated by evaluating the time‐averaged Poynting vector and integrating over the surface of the sphere. Applications of microwave power absorption are discussed, with particular emphasis on processing of materials. Numerical studies based on the newly derived formulas are presented. The results exhibit the manner in which microwave absorption is influenced by a number of different experimentally controllable parameters. The examples considered were chosen with a view toward designing experiments and apparatus for containerless processing of materials in the microgravity environment of space.
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