Electromagnetic field analysis of a microwave oven by the FD-TD method-a consideration on steady state analysis

We need uniform heating in microwave ovens. To remove unevenness, it is important to analyze the electromagnetic field distribution in the cavity of microwave ovens, and to optimize it. Generally, we must use three-dimensional analysis and are often faced with the problem of exceeding the computer resources available. We adopt the FD-TD method, which has the advantage of using computer memory more efficiently than other space dividing methods, such as FEM. But the FD-TD method is mainly used for transient analysis, and not often for steady state analysis. We first investigate the steady state convergence and then compare the calculated electromagnetic energy distribution with experimental heating unevenness. We see that the results are fairly similar.