We must need uniform heating in microwave ovens. To remove unevenness.it is important to analyze the electromagmtic field distribution in the cavity of microwave ovens. and to optimize it.Generally. we m u s t use three-dimensional analysis in microwave over^ and often face the problem of exceeding computer resouras available. So we adopt the Fl-TD method, which has an advantage of using computer memories over other s~ace dividing methods. mch as FEM.But the FD-TD method is mainly used for transient analysis, and not often for steady state analysis. So we first investigate in judgement on mvergence to steady state, then compare the calculated electromagnetic energy distribution with experimental heating unevennes;. We see that they fairly resemble each other. Figure I shows the model of a microwave oven which we analyze. We set fr-2.464MHz. and as;ume that only TElo mode can propagate in the exciting rectangular waveguide. The waveguide is mat&& at the source. II .MCWL FOR ANALYSISThe observing plane is at 40.0mm above the bottcm of the cavity. We use rectangular cells with the smallest cell size Ad=5mm and tire step At=1/(2.464x1Ogx50)sec. which satisfies the Courant stability condition".The operational memory is about 12hlbytes. and Bv times for calculating 30.000 time steps are 270 sec. by using our slpercomputer. I.GoN\IERCINXTO STE4DY SATE Figure 2 shows the energy flow at a cross section of the waveguide as shown in figure 1 . We calculate the su11 of the Pointirg's vector in this c r m section and integrate over ax: period which m r r m to 50 time steps. So this figure shows the relatihip between energy flow and 0-7803-2009-3/941$4.00 0 1994 IEEE. 1806
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