Design Of Magnetoelectric Antenna With New Mechanism

With the development of modern wireless communication technology,integration and miniaturization become the development trend of RF system.As an indispensable component of RF systems,antenna still faces many critical challenges.Traditional antenna radiation depends on electromagnetic resonance,so its size is usually comparable to resonant wavelength,which seriously hinders the miniaturization of wireless systems and is a key obstacle to realizing their mobility and portability.For decades,the technology of antenna miniaturization has not been revolutionary breakthrough.In this thesis,a new type of magnetoelectro-mechanical antenna based on acoustic resonance is studied for the purpose of antenna miniaturization.It uses specific electromagnetic frequency and acoustic wavelength to generate resonance,thus greatly reducing the size of the antenna.At the same time,it can ensure signal conversion efficiency through the strong coupling effect of magneto-acoustic-electrical "product effect".Magnetoelectromechanical antenna is the product of the deep cross integration of materials science,acoustics,magnetism and antenna.It is a brand new field of science and technology.It has a very important and broad application prospect in the future electronic countermeasure and communication.The main work and innovation of this thesis are as follows:1.Study on the whole process simulation design of magnetoelectric antennaBased on the technology of multi-physical field and finite element simulation,the radiation simulation model of magnetoelectric antenna is established by equivalent principle.It solves the problem of lack of modeling and simulation method for magnetoelectric antenna due to incomplete theory.Then,the magnetic dipole-like radiation characteristics of magnetoelectric antenna are proved by comparing the size of near-field RF magnetic field,which simplifies the antenna radiation model and improves the design efficiency of magnetoelectric antenna.2.One-dimensional simulation verification based on finite-difference time-domainUsing mathematical formula to characterize the working state of magnetoelectric antenna,the finite difference Time domain(FDTD)algorithm is used to simulate the onedimensional structure of magnetoelectric antenna.Through theoretical analysis and numerical verification,the working principle of magnetoelectric antenna that generates electromagnetic radiation by dynamic magnetic flux excitation through dynamic mechanical strain is verified,and the feasibility of magnetoelectric antenna is verified.3.Magnetoelectric antenna structure optimizationThe finite element simulation software is used to carry out parametric scanning on the size of the magnetoelectric antenna model of NPR structure,and the radiation power of the antenna is judged by comparing the magnetization intensity in the magnetostrictive layer,which provides a basis for the size optimization design of NPR magnetoelectric antenna.By simulating the magneto-electric coupling process of FABR magnetoelectric antenna when receiving magnetic field signals,the size of the bias magnetic field and the shape of the magnetoelectric antenna are optimized to achieve the optimal working state of the FBAR magnetoelectric antenna.4.Magnetoelectric antenna sample processing and testing verificationBased on FBAR resonator,magnetoelectric antenna samples were prepared by sputtering magnetic film method,and antenna testing environment was set up for system testing and performance evaluation.Finally,it is measured that the magnetoelectric antenna can still gain-21 dBi under the condition that the size of the antenna is two orders of magnitude smaller than that of the same frequency band.