【作者】 张钰狄；

【导师】 刘昌荣；

【作者基本信息】 苏州大学 ， 信息与通信工程， 2020， 硕士

【摘要】 随着生物医疗领域的不断发展,越来越多的人将关注点投入到无线医疗植入设备,无痛性、实时性、高效性成为了学者们所追求的目标。植入式设备可以将体内生物信息精确传输到外部接收机,一个完善的传输系统对于可靠通信是非常有必要的,因此,对天线、内部系统以及内外部传输链路的研究都是不可忽略的。本文首先从天线角度出发,创新性地提出了几款天线,另外通过自相位技术优化传输效率并且成功做出面向体温监测的胶囊系统,主要工作内容如下:(1)提出了 一款工作在915MHz的具有明显尺寸优势的宽带圆极化植入式天线。通过开槽和引入短路针来实现小型化,通过切角及调整短路针相对位置来实现左旋圆极化(LHCP)。其次,提出一款基于共轭匹配技术的叠层偶极子天线,通过设计天线阻抗与芯片阻抗共轭匹配,进一步促进了胶囊系统设计的小型化。(2)设计出一款基于自相位技术的无线能量传输系统,极大地提高了传输效率。首先将内部线圈整流天线作为发射天线,接着通过对外部天线单元接收到的相位进行共轭来设计馈电网路,最后让外部天线作为发射端传输能量。实验证明在植入式天线附近自相位馈电比同相时场强更强,该方式可以自动建立最佳路径实现能量聚焦化。(3)提出了一款面向体温监测的直径为11mm、长度为16mm的胶囊系统。该工作建立了完整的无线通信链路,并将集成好的胶囊系统放置于活体小鼠体中进行测试,小鼠体温被实时监测显示在显示屏上。通过活体实验证明,该胶囊系统为未来医疗应用奠定了很好的研究基础。总之,本文从天线设计角度出发,到传输链路优化再到系统集成设计,创新性地提出如上工作,具有很好的应用前景。更多还原

【Abstract】 With the development of biological field,more and more people take interest in wireless medical implantable devices.Painless,real-time,high efficiency has become basic performance of those devices that researchers pursue.Implantable devices can transmit in-body physical information to outer receivers accurately.A complete transmission system is necessary for reliable communication,therefore,research on implantable antennas,internal systems and communication link cannot be ignored.Based on the design of antenna,this paper innovatively proposes several kinds of biomedical antennas,self-phase technology for high-efficiency transmission and temperature monitoring capsule system.The main work contents are as following:(1)A wideband circularly polarized implantable antenna tested in a mixture solution working at 915MHz is presented.Miniaturization is realized by cutting slots and shorting pin,while angle cutting and parameters adjusting promote circular polarization(CP).Besides,a stacked dipole antenna based on conjugate matching technology is proposed.By designing antenna impedance conjugate with chip impedance,it paves way for the miniaturization of the whole capsule system(2)A wireless transmission system based on self-phase technology greatly improving transfer efficiency is proposed.Firstly,an internal coil rectenna is used as transmitter,then making conjugate calculation of the phase received by external slot antenna unit is necessary Secondly,a feeding network is designed.Lastly,outer antenna array is taken for transmitter The experiment demonstrates that the field density around implantable antenna by self-phase feeding is stronger than by in-phase feeding.Therefore,in this way,the optimal path can be automatically established for focusing the transmission energy(3)The capsule system with a dimension of 11mm(diameter)×16mm(length)is proposed for temperature monitoring.In this paper,the wireless data transfer link is established,and an in-vivo measurement is conducted to validate the system practicability.The body temperature of the rate is shown at a display screen.Through practical testing,we believe that the capsule system will lay a good foundation for future medical applications.In short,from antenna design to optimized communication link and integrated system design,this paper innovatively proposes several works for good application prospect.更多还原