Design Of Antenna On Implantable Electronic Label

In the next few years, implantable sensor tags will play an important role in the monitoring, diagnosis, therapeutic and other applications. One of the major challenges is to be able to power these sensor tags efficiently and reliably for a long time. The wireless transmission of energy by inductive coupling is a kind of good method. Inductive link transfers energy by coupling coils which form a hollow transformer. The main coil is located in the skin, while the second coil is implanted in the human body. Compared with off chip antenna, on-chip antenna has the advantages of small volume, low cost and high reliability. However, limited to small volume as well as standard process, the link energy transmission efficiency that bases on on-chip antenna is often low.First of all, a lumped model of on-chip antenna that works at high frequency is established through the analysis of parasitic losses and from the perspective of silicon-based spiral inductor in this thesis. Then, the validity of this model is verified by electromagnetic field simulation software. Secondly, by modeling the energy transmission link between on chip antenna and the reader antenna, the maximum efficiency is obtained under the best impedance matching condition.Then, a method of collaborative optimization design between on-chip antenna and reader antenna is adopted and the link transmission efficiency of energy is improved. The energy transfer efficiency is3.8%and0.15%for separation distances1mm and1cm, respectively.In addition, the effect of human tissue on wireless energy transmission at high frequency is explored and draws a conclusion that, relative to work in air, due to the influence of the biological tissue, the two antennas need to be redesigned in order to obtain higher energy transfer efficiency. At last, an on-chip antenna that covers a size of approximately2.1*2.1mm2and works at13.56MHz is designed, based on SMIC0.13um process. And the antenna is verified by test.