基于CSRR的无创血糖检测微波传感器设计

Design of Non-Invasive Blood Glucose Detection Microwave Sensor Based on CSRR

摘要: 本文提出了一种新型便携式平面微波传感器设计，以提高无创血糖检测的便利性与准确性。该传感器采用四个中心对称菱形排列的圆形互补开口环谐振器(Complementary Split Ring Resonator, CSRR)单元，蚀刻在FR4介电基板的底部接地金属层上，并通过基板顶部的平面微带线耦合馈电。CSRR传感元件的设计使葡萄糖溶液与感应共振区域的电磁场产生强烈的相互作用，从而检测不同葡萄糖浓度样品的微小电磁特性变化，提升了血糖水平(Blood Glucose Level, BGL)检测的灵敏度。该传感器在0~20 GHz范围内表现出较高的灵敏度，通过调整模型尺寸，检测灵敏度由5.06 MHz/(100 mg/dL)提升至11.30 MHz/(100 mg/dL)。随着检测频率的提高，传感器的主要参数与检测灵敏度呈现高度的线性相关。

Abstract: This paper proposes a novel design of portable planar microwave sensor aimed at enhancing the convenience and accuracy of non-invasive blood glucose detection. The sensor employs four circular Complementary Split Ring Resonator (CSRR) units arranged symmetrically in a diamond configuration, etched onto the bottom grounding metal layer of an FR4 dielectric substrate, and coupled fed through microstrip lines on the top surface of the substrate. The design of CSRR sensor elements allows strong interaction between glucose solution and the electromagnetic field in the resonance region, thereby detecting subtle electromagnetic variations characteristic of different glucose concentrations, enhancing the sensitivity of Blood Glucose Level (BGL) detection. The sensor demonstrates high sensitivity within the 0~20 GHz range, with sensitivity improving from 5.06 MHz/(100 mg/dL) to 11.30 MHz/(100 mg/dL) through adjustments in model dimensions. Moreover, as the detection frequency increases, the sensor’s primary parameters exhibit a highly linear relationship with detection sensitivity.