Research On Performance Of Wearable Flexible Antenna

In recent years,the Body-Centric Wireless Network(WBAN)has developed rapidly as an important part of the fifth generation of mobile communications,and wearable antennas are the key to the interconnection and signal transmission between networking devices.It is also a hot issue that researchers are concerned about.Based on the particularity of its work,this topic focuses on the interaction between the performance of the wearable flexible antenna and the human body itself.Based on the research of microstrip antenna design theory,the article first uses HFSS threedimensional simulation software to establish a human body numerical model and uses epoxy resin(FR4)as a dielectric substrate to design a microstrip patch antenna that works at 2.45 GHz.And with the help of HFSS to model the antenna and optimize its working performance;secondly,research the antenna performance based on different flexible materials to explore the influence of different materials on the antenna performance;thirdly,when the human body moves,it will indirectly lead to the deformation of the antenna As a result,the working performance is changed.This article approximates the antenna bending model to simulate the situation and analyzes the difference in antenna performance.Finally,in the vicinity of the human body,the interaction between the electromagnetic characteristics of the human body and the working performance of the antenna is analyzed,and the electromagnetic radiation is targeted(SAR value)and the performance of the antenna near the human body.The analysis results show that the resonance frequency of the microstrip antenna with FR4 as the dielectric substrate is simulated in HFSS to be 2.45 GHz,and the terminal matches the transmission line well;as the antenna approaches the human body,the return loss value changes,and the resonance frequency appears smaller Fluctuations,mismatch between the antenna and the feeder,and the SAR value of electromagnetic radiation received by the human body is lower than the 2.0 W/kg defined in the national safety standard;when the antenna designed based on polyimide(PI)material is bent,The center frequency shifts toward high frequency,the return loss value increases,and the antenna's ability to send and receive signals is enhanced.When the degree of bending gradually increases,each parameter maintains the same trend,but the range of change decreases.