中文摘要：

皮肤电极单元是利用体导电向体内植入器件传递能量的通道，其等效电路阻抗参数则是从电路角度分析体导电能量传递系统的基本参数。针对目前尚无确定这些参数的理论计算方法，提出了基于场路耦合的变载法。通过建立皮肤电极单元的场路耦舍模型计算电极端口处电压与电流，并运用全相位FFT谱分析提取电量信号的幅值和相位，在此基础之上，应用变载法求出了各种条件下皮肤电极单元等效电路的阻抗参数，并验证了该方法的正确性。计算出的等效电路阻抗参数可用于体导电能量传递的电路分析和系统的优化设计。

英文摘要：

Skin electrode unit is a channel through which energy can be transferred to the implanted device by volume conduction. The unit can be equivalent to lumped circuit, but so far there are no appropriate calculation methods of these circuit parameters, so variable load method based on field-circuit coupled is proposed. A skin electrode unit field circuit coupled model is established to obtain the relationship of the network parameters between voltage and current at electrode port, and the amplitude and phase of the power signal is extracted by the use of all phase FFT spectrum analysis. On this basis, equivalent circuit impedance parameters of the skin electrode unit under various conditions are obtained by the application of variable load method and the validity of the method is verified. Asaresult, the equivalent circuit impedance parameters obtained in this way can be used for the circuit analysis and optimization of the volume conduction energy transfer system.