Design and Application of Non-Contact Biosensing Patch Antenna
Date Issued
2012
Date
2012
Author(s)
Chang, Fu-Chieh
Abstract
The outstanding properties of microwave antenna sensor have drawn much attention in recent years. It provides numerous advantages, including real-time detection, and little sample for consumption. Since microwave antenna sensor does not require fluorescence and chemical markers labeling, and it does not cause environmental pollution. Utilizing a novel transmission line design, we have devised a patch antenna biosensor with metamaterial property in this study. A slot was fabricated on the backside of the antenna as an ultra sensitive sensing area. The sensors that we designed have been proven, through repeatable experiments, shown several advantages such as small size, low frequency, real-time, label free, sensitive and low cost. The measured results indicate that antenna sensor can effectively determine the permittivity and loss tangent, without being affected by environmental disturbances.
In this study, we explored some of the possible future applications by measuring some liquid and solid samples. The liquid samples include not only ethanol and methanol in different concentrations but also red wine and whiskey from different manufacturers. The samples of solid included pork and agarose. These experiments confirmed the antenna sensor is capable of detecting the difference in either moisture contents or components of the materials on sensing area, by the change of the resonant frequency and matching degree. These experiments demonstrated that using composite structure for microwave as antenna sensor not only benefit from its advantages but also breaks the limits of traditional sensors. These results broaden the possible applications of microwave antenna.
Subjects
metamaterial
antenna sensor
Type
thesis
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