Abstract
In this paper, we investigate transmission properties of dextrose (D)-(+)-glucose solution with concentration variations using a reusable coplanar waveguide (CPW) device in the frequency ranging from 1 GHz to 10 GHz. In the present experiment, three concentrations of glucose solution, 0.2, 0.4, and 0.6 g ml−1, are measured on the proposed CPW device, and these results are also compared with that of deionized water as a control solution. From the comparative results, as glucose concentration increases, transmission properties are gradually degraded due to the reduction of penetration depth as well as the increase of electric resistance in the observed frequency region. As a result, it can be noted that the concentration variation of D-(+)-glucose solution has a significant effect on the transmission properties related to the microwave circuit, i.e. electric resistance, and field, i.e. penetration depth. In terms of the microwave circuit and field, we expect that our finding can provide fundamental sensing properties for highly sensitive glucose detection via a non-invasive and non-contact technique.
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