Transformation Optics for Computing Heating Process in Accordion Microwave Oven

摘要

Many households own domestic microwave ovens due to their convenience. However, the microwave frequency and cavity dimensions produce standing waves. There are some drawbacks of microwave heating specifically in non-uniform heating which limit the development. In order to improve the uniformity of the electromagnetic field in microwave multi-mode cavities, Plaza-Gonzalez et al. studied several kinds of mode stirrer configurations to change the electric field distribution and the mode of the electromagnetic field in multi-mode cavities. The conventional domestic microwave ovens with fixed geometry is cumbersome and takes up space when not in use. In this paper, we present a novel accordion microwave oven which solves the moving boundary based on transformation optics. Transformation optics is proposed to solve the problem of the moving boundary during the model simulation. The accordion zone is replaced by a time-varying anisotropic layer on the basis of transformation optics, allowing the electromagnetic field inside the accordion microwave oven to be computed with consideration of the continuous motion of the moving boundary. The accuracy of this method is verified by comparing with the electric field distribution and the reflection coefficient of the port with the discrete position. By comparing with the COV (temperature coefficient of variation) of the heated material, it can be seen that the prosed method can greatly improve the uniformity of temperature distribution.