Presentation Information
[C-2C-03]Glucose Concentration Measurement using a CSRR Sensor with a Q-Value Enhancement Circuit
◎△Kuniaki Kure1, Shunya Watanabe1, Hinata Itou1, Yasuhiro Sugimoto2, Kiichi Yamashita1, Akira Yasuda1 (1. Graduate School of Hosei University, 2. Chuo University)
Keywords:
high frequency,sensing
There is increasing demand for non-invasive blood glucose sensors that do not require blood sampling. CSRR (Complementary Split Ring Resonator) microwave sensors can detect changes in glucose concentration through shifts in resonant frequency caused by changes in the permittivity of a sample placed on the resonator. However, lossy media such as glucose aqueous solutions decrease the Q-value, reducing the accuracy of frequency detection. In this study, a conventional CSRR sensor with a Q-value enhancement circuit was improved to achieve a higher Q-value and sensitivity. The substrate was changed from FR4 to low-loss MEGTRON6, and the CSRR size was reduced from 12 mm to 10 mm to decrease the capacitive component and improve the resonance characteristics. As a result, a maximum Q-value of 4085 was obtained with a 100 mg/dL glucose aqueous solution, which is about seven times higher than the conventional value of 566. The frequency sensitivity was 103.7 MHz/wt% for glucose concentrations from 0 wt% to 10 wt%. These results show that the improved CSRR structure enables highly sensitive glucose concentration measurement.