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Experimental Study on Contact Impedance of Intra-body Communication Transmitter

CHEN Yidong1,CAO Yuting1,GAO Yueming1,S.H.Pun1,2,P.U.Mak1,2,M.I.Vai1,2,LI Yurong1,DU Min1(1.Key Laboratory of Medical Instrumentation & Pharmaceutical Technology,Fuzhou 350002,China;2.Biomedicine Department ofElectrical and Electronics Engineering,Faculty of Science and Technology,University of Macau,Macau SAR 999078,China)  
Focusing on the method of galvanic coupling,an equivalent circuit model of human forearm at the transmitter was simplified and developed.In order to clarify the effects of the electrode-skin impedance during intra-body communication(IBC),an alternating square-wave current was adopted to measure the parameters of the model in different sizes of electrode arrangements.Furthermore,the signal attenuations at different frequencies at 10 volunteers′ forearm were compared.The results showed that the attenuations were increasing along with the electrode-skin contact impedance.Similar results also appeared in the measurements of the calf.Therefore,the minimizing electrode-skin contact impedance is supposed to improve the quality of Intra-Body Communication.
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