A Study of the Relationship among Load Variables in Microwave Heating System Based on Radio Frequency Circuits
The relationship between changes in variables such as FM voltage,output frequency,and RF current caused by load changes in the process of driving a microstrip antenna to heat tobacco based on a radio frequency circuit was investigated.By modifying the FM voltage of the RF driving circuit program,the voltage,RF frequency and current were measured in the microwave heating from 0min to 4min in 1min steps.Analyzing the data,it can be seen that:the RF output frequency increases gradually with the increase of the FM voltage;the RF current decreases gradually with the increase of the FM voltage;for the microstrip antenna with a center frequency of 2.7 GHz in this paper,when the FM voltage is located at about 2.45 V,the output RF frequency is in the range of 2.66 GHz to 2.74 GHz;when the mi-crowave heating of tobacco media,the large tobacco load in the early stage of heating leads to a brief increase in current,and then the cur-rent decreases steadily;using the HFSS software to simulate the microstrip antenna,the antenna is able to work normally when S11<-10dB,and the power consumption of heating the tobacco medium is about 0.23682 watt-hours in 4 minutes.The study provides a basis for the optimization of microwave heating effect based on the load variable relationship.
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