使用网络分析仪测量了宽频带200 MHz~10 GHz内葡萄糖水溶液的介电特性。测量结果表明,当频率不变时,葡萄糖水溶液的介电常数和电导率均随葡萄糖浓度的增大而减小。单阶Debye模型和二阶多项式被用于拟合各浓度下葡萄糖水溶液介电特性的测量数据,有效量化了介电特性随浓度和频率的变化关系。基于Debye模型参数建立了三维耳垂色散模型和天线收发结构。仿真结果表明,S21信号与葡萄糖浓度之间在相当宽的频带范围内都保持着稳定的、规律性的响应关系,该响应关系可通过二次多项式表达。基于S21的微波无创血糖检测方法可用于未知血糖浓度的评估。

In this paper, the dielectric properties of aqueous glucose solution with a broadband of 200 MHz--10 GHz are measured using a network analyzer. The measurement results show that when the frequency is constant, the dielectric constant and conductivity of the solution tend to decrease as the glucose concentration increases. The single-order Debye model and second-order polynomial are used to fit the measurement data of the dielectric properties of the aqueous glucose solution at each concentration. The relationship between dielectric properties and concentration and frequency is effectively quantified. Based on the parameters of the Debye model, a three-dimensional earlobe dispersion model and an antenna transceiver structure are established. The simulation results show that the S₂₁ signal and glucose concentration maintain a stable and regular response relationship over a wide frequency band, which can be expressed by a quadratic polynomial. This microwave non-invasive blood glucose detection method based on S₂₁ can be used to evaluate unknown blood glucose concentrations.