The Research Of Microwave Heating Technology Based On High-Loss Transmission Line

Microwave heating technology and its application have always been one of the most active research contents at home and abroad,all these researches are intent to achieve efficient conversion from microwave energy to thermal energy.At present,the microwave heating technology and its application are largely based on the principle of cavity resonance,which converts microwave into heat energy in metal cavity.Microwave ovens and large-scale application equipment using this form of microwave cavity are used widely.The recent research direction of the subject is basically improving the performance based on the cavity resonance theory and there are few innovative breakthroughs.In this paper,the literatures on microwave heating related aspects at home and abroad was investigated,and the microwave heating method was studied.The main research an innovation are as follows:First,the concept of microwave heating research based on high loss transmission line is proposed,Firstly,the structure and composition of various types of transmission lines in microwave are analyzed.Secondly,the suspended microstrip lines suitable for microwave heating are selected and analyzed.According to the structure of the suspended microstrip line,a composite medium suspended microstrip line is proposed,and the structure is applied as a prototype in microwave heating design.Second,in order to verify the feasibility of the composite medium transmission line,two kinds of transmission line structures,which are open circuit and short circuit,were simulated and designed,and physical processing and experiments were carried out for each structure.The heating effect diagram of each structure was given,and the composite transmission line was verified for microwave heating.On the basis of verification feasibility,in order to expand the heating area,the open-circuit bending composite medium transmission line model was designed,and the open-circuit bending structure models was processed and experimented.The experimental results were analyzed to ensure the S-parameter agreement.The heating area is enlarged to be consistent with the expected results of the design model.Third,according to the index demand,the high-loss transmission line theory is applied to design the bending transmission line model.On the basis of ensuring the S-parameter and guaranteed efficiency of the feed port to the model,the heating area is enlarged.The design model is physically processed.Besides,the dimensions of the metal shield cavity required by the system were studied.The influence of the cavity size on the S-parameters of the system and energy utilization rate of the medium was analyzed.The design model and physical maps were given.Finally,the power amplifier sources required for the system are combined to form a heating system for microwave heating.The experiment verification of the system,from the power amplifier source to the heating system,the efficiency is as high as 84.15%,which verifies the feasibility of the proposed high-loss transmission line applied to microwave heating.The effect of shape of the medium was also analyzed in the end.