Design and Applications of a Coplanar Waveguide Antenna Biosensor
Date Issued
2012
Date
2012
Author(s)
Yin, You-Zheng
Abstract
As the demand for biomedical sensing applications increase, an innovative techniques and architectures are required. To overcome the limitations of traditional methods, noninvasive near-filed electromagnetic sensing technique is proposed for biomedical applications. An antenna based biosensor is developed to investigate the near-field electromagnetic interaction between antenna and sample with different dielectric properties. These dielectric properties can be determined by analyzing the electromagnetic coupling between the antenna and the test samples without labeling or chemical reaction.
The antenna biosensor is developed by applying the coplanar waveguide (CPW) feeding mechanism, a surface-strip transmission line (TL), which consists of a strip on thin metallic film deposited on the surface of a dielectric slab with two ground electrodes running adjacent and parallel to the strip on the same surface. The coplanar waveguide offers a variety of advantages over the conventional micro-strip line, it can be placed conveniently in contact with one side of the test material and therefore provide non-destructive measurements. The coplanar waveguide (CPW) antenna biosensor is modeled and simulated with Ansoft HFSS and fabricated on inexpensive FR-4 substrate of thickness 0.8 mm, the overall dimension of the antenna biosensor is (20x20x0.8)mm3. Two measurement methods were applied in this research, one supply the sample to the surface of the antenna with a tape boundary, and another by a fluidic channel attached on the backside of the coplanar waveguide antenna biosensor, all measurements were taken by Agilent E5071B Network Analyzer.
Experimentally validated the liquid samples with different dielectric properties, different concentrations of ethanol, methanol, glucose, sodium chloride solution, and different daily beverage like beer, red wine and liquor were measured and determined with the proposed coplanar waveguide antenna biosensor. The results exhibit the potential applications in bio-sensing.
Subjects
noninvasive
near-field electromagnetic
coplanar waveguide
dielectric
antenna biosensor
Type
thesis
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