Reseach On Magnetoelectric Antenna Based On Bulk Acoustic Resonance And Its Broadband

Ultra High Frequency(UHF,300-3000MHz)electromagnetic communication is widely used in wearable and wireless implantable medical devices.Antenna,as an important part of the whole communication system,has problems such as large volume and difficulty in integration for the requirements of wearing and implantation.However,the miniaturized design of traditional antennas will bring technical challenges such as low gain and difficulty in impedance matching,which seriously limits the development of intelligent wearable and minimally invasive implantation industries.Therefore,the development of new radiation mechanism of miniaturized antenna has important engineering application value and academic research significance.In this paper,the magnetoelectric antenna based on bulk acoustic resonance is studied systematically.The specific contents are as follows:1.The overall design of magnetic electric antenna based on bulk acoustic resonance antenna is studiedBased on UHF communication technology requirements and the working principle of the magnetoelectric antenna completed the magnetoelectric antenna structural design,analyzed the influence of different materials on the magnetoelectric antenna performance,this paper derived the magnetoelectric Mason equivalent circuit model of antenna,established the magnetoelectric antenna material of each part model library,and through the simulation of the antenna structure parameters was optimized by electrical impedance characteristics,The results show that the impedance matching can be carried out by adjusting the electrode area,which solves the problem of the impedance matching of the traditional small antenna.2.The mechanism of magnetic electric antenna based on bulk acoustic resonator is studied Aiming at the problems such as the basic theory of magnetoelectric antenna is not perfect and lack of complete modeling and analysis method,the theoretical model of magnetoelectric antenna is established,and the working mechanism of magnetoelectric antenna is studied by simulation analysis.Firstly,the coupling effect of the magneto-electric antenna in the receiving process is studied,and the coupling between the RF magnetic field and the volume acoustic wave is verified.Then,the acoustic resonance characteristics of the magnetoelectric antenna based on bulk acoustic wave are studied,and the effects of loss and structural parameters on the performance of the magnetoelectric antenna are analyzed.Finally,the radiation characteristics of the magnetoelectric antenna are studied by the principle of surface equivalence.The results show that the magnetoelectric antenna can be equivalent to a dipole.3.Machining and testing of magnetoelectric antenna prototype and broadband researchFirstly,in view of the low yield of magnetoelectric antenna processing,the technological process was optimized,and the antenna sample was prepared by magnetron sputtering method.Then,a multi-field test platform was built and the system was tested and the performance was evaluated.Finally,the broadband research was carried out for the problem of the width of the magnetoelectric antenna band.The test results show that the magnetoelectric antenna radiation signals come from the magnetoelectric coupling at the acoustic resonance frequency,which proves the reciprocity of the magnetoelectric antenna and verifies that its pattern is similar to that of a dipole.The gain of the antenna is further calculated to be-15.8 dB,and the size can be reduced by two orders of magnitude at the same frequency.