In this paper, however, we demonstrate with in-vivo and in-vitro experimental proof that, when a measurement was conducted predominantly in surface modes, a positive association between the glucose concentration and the blood permittivity was noticeably observed. During an in-vivo experiment, a cylindrical volume of meat tissues with a known blood glucose level was first formed with the help of a suction aspirator. The exterior wall of the suction aspirator was then wound with one turn of a gelatine-coated copper wire, which is referred thereafter as Goubau line sensor. The two terminals of the Goubau line sensor were then connected to ports 1 and 2 of a Vector Network Analyzer for measuring the S-parameters. The results of our in-vivo experiment show that, in the absence of any significant leaky wave radiation from the sensor, the measured blood glucose concentration positively correlates with the measured S21 parameters in a highly reproducible manner. Keywords: Blood Glucose, Surface Waves, Diabetes, Leaky Waves, Goubau line, Smoking cessation
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