Design of Biosensing Antennas Based on the Concept of Metamaterial
Date Issued
2010
Date
2010
Author(s)
Shiu, Jerome
Abstract
Many literatures about microwave biosensor have been presented for applications in recent years. However, with the rapid development of modern biosensing technology, biosensing devices are asked for as small as possible. Hence, miniaturization has become an important issue for sensitive microwave biosensor.
The antenna is more sensitive than other microwave structures as long as the microwave sensor is concerned, and using the metamaterial concept has been provided to be capable of reducing the size of the antenna. Therefore, antennas and metamaterial concept would be a solution to this problem. In this thesis, a patch antenna biosensor and a slot loop antenna biosensor based on the transmission line-metamaterial concept are proposed. The developed biosensor design is based on the resonant antenna architecture using the interdigital capacitors as an ultra sensitive biosensing area. The biosensors have the advantages such as small size, low frequency, real time, label free, sensitive and low cost. The small sample under test is placed on top of the biosensing antenna, which determines the permittivity and loss tangent of materials by the scattering parameters. We provide in this study some figures for determination of the permittivity and loss tangent from the shift in the resonant frequency and the |S11| level of the materials. Both simulation and experimental results for biosensing antennas and alcohol solution characteristics are presented.
All biosensing antennas are theoretically studied and experimentally verified.
Subjects
dielectric measurements
metamaterials
microstrip antennas
microwave measurements
miniaturized antennas
slotantennas
Type
thesis
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