Design And Preparation Of Magnetoelectric Antenna For Internet Of Things

The antenna must meet stricter dimensions criteria as the size of communication devices in the Internet of Things continues to diminish,the degree of integration rises,and the number of accesses rises.Following the trend of shrinking and integration of communication antennas,this article focuses on the investigation of magnetoelectric antennas that are 2-3 orders of magnitude smaller than electrically tiny antennas.This paper examines the coupling mechanism of acoustic and electromagnetic waves from three perspectives,including multi-physical field modeling of magnetoelectric antenna,design,preparation,and testing of bulk acoustic magnetoelectric antenna for the Internet of Things,and design scheme of Lamb wave magnetoelectric antenna,with the goal of addressing the issue of low radiation efficiency caused by unclear multimode acoustic electromagnetic wave coupling mechanism of 2-2 type magnetoelectric antenna.The specific research is as follows:In order to investigate the way that multimode acoustic and electromagnetic waves are coupled,a two-dimensional anisotropic and nonlinear magnetoelectric antenna model is set up.This allows for the creation of acoustic modes with high radiation efficiency.In order to swiftly choose acoustic modes with high radiation efficiency in the low frequency,high frequency,and ultra high frequency(UHF)Internet of Things frequency ranges,a comprehensive frequency domain simulation model is first created using the finite difference time domain method.Then,a flexural plate wave magnetoelectric antenna is suggested for both low and high frequencies,and its equivalent circuit model is constructed by calculating the force magnetic coupling coefficient to streamline the design process and emphasize the design points.In order to thoroughly examine the acoustic electromagnetic wave coupling process of the UHF bulk acoustic wave magnetoelectric antenna,a finite element model is built based on the variational concept.The findings demonstrate a correspondence between the radiation center and the peak of the transverse wave standing wave.Design and prepare a bulk acoustic wave magnetoelectric antenna for the Internet of Things and,based on the test findings,investigate the process of how transverse waves affect bulk acoustic wave devices.Firstly,the model is used to extract the design essentials of the UHF bulk acoustic magnetoelectric antenna for the Internet of Things.The effects of various parameters on radiation efficiency are studied from four aspects:pre magnetization,loss,coupling coefficient,and thickness ratio.Then,multiple regression analysis is used to clarify the design essentials.The impact of transverse waves on the bulk acoustic wave magnetoelectric antenna is then investigated using a threedimensional model and various variations of the device’s design.Finally,according to the design points,pentagonal and circular bulk acoustic magnetoelectric antennas were prepared to explore the mechanism of the impact of transverse waves on bulk acoustic devices.The test results show that the 2.4 GHz magnetoelectric antenna has been successfully prepared,with the highest radiation efficiency of about 0.14%,and it is found that the use of transverse waves can effectively enhance the radiation efficiency of the bulk acoustic wave device.A high radiation efficiency Lamb wave magnetoelectric antenna for the Internet of Things is created using the transverse wave enhancement technique.Take the electrode boundary as the reflection boundary of the transverse wave,adjust the electrode width to regulate the transmission of the transverse wave to form a standing wave,and enhance the standing wave by taking advantage of the feature that the incident wave and the reflected wave at the electrode boundary are in phase.Based on this technical,a design scheme of Lamb wave magnetoelectric antenna for the Internet of Things is proposed.The calculation results show that the radiation efficiency of the Lamb wave magnetoelectric antenna is about 9 times stronger than the bulk acoustic wave magnetoelectric antenna.The final results show that the Lamb wave based on transverse and longitudinal wave coupling is a sound wave excitation mode of a magnetoelectric antenna for the Internet of Things that covers a wide frequency domain and has high radiation efficiency,and has certain research value and application potential.