利用超穎物質概念之生物感測天線設計

Abstract

近年來，有相當多微波生物感測器的探討及應用，而隨著生物感測技術的進步，生物感測設備有越來越小的趨勢，因此靈敏的生物感測器微小化，當然成為一個重要的課題。 天線會比其他微波結構靈敏，而利用超穎材料的概念可以縮小天線的尺寸；因此，天線和超穎材料將會是解決此問題的答案。在本論文中，我們提出了利用超穎材料傳輸線概念設計的平面矩形天線生物感測器和共平面開槽迴路天線生物感測器，這些生物感測器設計是利用共振天線架構，並利用指叉電容作為一靈敏的感測區。此生物感測天線有以下特點：體積小、工作頻率低、即時偵測、免標記、靈敏度高和成本低。將小量的待測物置於生物感測天線後，利用散射參數去判別物質的介電係數和損失正切；而我們在論文中也提供一些圖，運用這些圖，便可利用查表的方式，對照出不同物質的共振頻率和匹配度所對應的介電係數和損失正切；此生物感測天線和酒精溶液特性的模擬和實驗數據都會放在論文中。 上述所提出生物感測天線，都會有理論的探討及實驗的驗證。

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.