Wearable And Implantable Antennas Based On Health Care

In recent years,with the rapid development of wireless communication technology,wans,a novel network communication method,has attracted great attention.In this trend,it is necessary to research the antenna applicable to the human body.The research direction of this paper is the volume domain network antenna.The specific research and design of the antenna are carried out from the two directions of the flexible wearable antenna based on MIMO technology and the implantable circular polarization antenna.The conformal property of the flexible medium can bring a good wearable experience to the wearable antenna.MIMO technology can improve system capacity and enhance system stability.Circular polarization can improve antenna sensitivity and resist multipath effect.The main work of the thesis is as follows:(1)A wearable MIMO antenna based on flexible media is designed.The antenna has three independent antenna units,which are distributed in a ring on a circular medium with the same distance between them,and have omnidirectional radiation characteristics.The flexible polyimide is used as the medium,and the antenna has a structure with low profile.The antenna covers the 2.38-2.54 GHz frequency band,and the coupling effect between antennas is all less than-16 d B,which can be applied to ISM frequency band.In addition,the influence of antenna deformation on the radiation performance is studied on this basis.(2)An implantable circular polarized patch antenna was designed.The antenna is very compact in size,with a volume of 91.9 mm~3.On the basis of the traditional circular polarization performance method,the implanted antenna introduces the cross slot into the center of the radiation patch,the edge is loaded with the arc slot and short circuit pin,and the final structure of the antenna is obtained.Simulation results show that the antenna has a CP bandwidth of 18.3%.Compared with previous implantable antennas,the antenna has the advantages of small size and wide CP bandwidth.Finally,the antenna is machined,and the measured results are basically consistent with the simulation results after welding,which is suitable for biomedical equipment.(3)The antennas proposed in(1)and(2)were used for joint communication to construct a volume domain network for in vivo and in vitro communication.The human body simulation model of body domain network is a single arm model.The flexible MIMO antenna is worn on the arm and the implantable is arranged in the muscle tissue below the MIMO antenna.The final simulation results show that the in vivo and in vivo antennas all cover 2.45 GHz frequency band,and the coupling between antennas is lower than-18 d B,so the antenna system is suitable for body domain communication.