Analysis Of Microwave-Thermal Model By Using FDTD

The topic of this paper originates from the research "Semiconductor Property FDTD Modeling in Macrocosm", which is aided by the National Nature Science Fund. This paper mainly analyzed the heating effects when microwave acts on materials and set up an EM-Therm model using the FDTD method as the analyzing tool. Some practical microwave-heating examples were simulated and the results were compared with those from experimentation.First, the difference equation, numerical stability condition, boundary condition, power sources settings and some improved speedup techniques of the Finite-difference Time-domain Yee computational method were introduced briefly in which with the Multi-Time Step method and the Frequency-dependent Finite-difference Time-domain ((FD)2TD) method emphasized.Second, An EM-Therm model for microwave-heating problems was brought forward. Detail analysis of conducting and radiation heat transport model with the settings of their boundary conditions was given. Conforming the thermal model and the EM model into a new EM-Therm model, which is used to analyze the microwave-heating process.Final, Application examples using the model above to analyze the heating of Gel material in microwave oven and uniform plane wave normally incident on air-medium interface were showed. Detail datum of the initial temperature distribution, radiation heating, microwave heating, hybrid heating and using the (FD)2TD method were given and compared with datum from experimentation. Thus, the feasibility and stability of the EM-Therm model were proved. Limitation of our work was also given and hoped to overcome in further research.