Affiliations: [a] College of Electronics and Information Engineering, Sichuan University, Chengdu, Sichuan, China | [b] School of Electronics and Information Engineering, China West Normal University, Nanchong, Sichuan, China
Correspondence:
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Corresponding author: Kama Huang, College of Electronics and Information Engineering, Sichuan University, Chengdu, Sichuan, China. E-mail:[email protected]
Abstract: Microwave heating has been widely used and the heating
uniformity is related to the characteristics of electric field. In this
paper, we investigate the stability of electric field in a multimode
microwave cavity by analyzing the spectrum and the condition number of
integral equation. Results show that the stability of the electric field is
mainly dependent on microwave frequency, the permittivity of heating object
and cavity geometrical parameters. Particularly, when the heating object has
a low loss factor, the electric field is generally unstable. Namely, a tiny
shift of the parameters mentioned above will result in dramatic changes
of electric field distribution. Besides, the instability of the electric
field increases with the lower loss, the higher microwave frequency or the
larger permittivity of the heating object.
Keywords: Electric field stability, multimode microwave heating cavity, spectrum, condition number
