Study Of RF Microwave Energy Focus And Its Effect

Not only can be used in wireless communications,radio and microwave signals,due to its heating effect,also has a very wide range of applications in the field of detecting and medicine.So the electromagnetic wireless power focus and its multiphysics effect based on this become one of the focus of research.In this paper,the microwave energy focus and its effect are discussed.We first introduce the theory of time reversal.According to the existing focusing method with broadband microwave time reversal,the spatial-frequency discrete microwave power focus method is proposed.In this method,we replace the broadband signal with a series of discrete signals in view of operability.Compared with traditional broadband microwave time reversal method,focus efficiency is close but flexibility and maneuverability are greatly improved.Then,in terms of the heat effect of RF energy focus,this paper puts forward a high efficient model of RF-thermal energy conversion and it makes full use of the convergent electromagnetic energy.In this paper,wireless energy transfer theory is adopted to design the wireless energy absorption structure based on LC resonant model.Simulation and experiment confirm the validity of this structure.We also study the heating effect of the structure with multiphysics and try to make it smaller to centimeter level.Maybe it can be used in medicine.Further,we try to use the multiphysics field method to analyze general microwave components.Based on the basic theory of various physical fields,we list their partial differential equations,look for the contact and law among them,discuss the field coupling relationship among them systematically,and build a multiphysics model with the fusion of electromagnetic,thermal and stress and the fundamental partial differential equation system with various boundary conditions.Then the multiphysicas analysis model of high power microwave components under the condition of electric-thermal-stress is established.