本論文提出一新型應用於植入式生物遙測系統之多頻天線設計，由文獻回顧中，可了解目前的植入式天線皆僅設計在單頻、雙頻或三頻操作，而且天線體積過大、頻寬與增益皆較低及操作頻段不足。在現今多樣式植入式裝置蓬勃發展的情況下，必須同時兼顧生理資訊傳輸、無線供電、微型幫浦控制及睡眠喚醒等四種功能，否則將無法完全符合未來整合生物遙測應用的需求。所以本論文研究之小型化植入式天線設計在四個頻段，分別是無線醫療頻段(MedRadio)(401-406 MHz)、無線醫療遙測頻段(WMTS)(1427-1432 MHz)及兩個工業科學醫療頻段(ISM)(433-434 MHz及2.4-2.4835 GHz)，這四個頻段可涵蓋人體區域網路(BAN) 規範在3GHz以下之應用。
為了實現小型化可適用於植入式生醫通訊頻段的多頻天線設計，本論文使用之主要方法如下: (1)調整邊緣電場之電容效應，以增加天線之頻寬；(2)調整天線饋入點，以達阻抗匹配之目的；(3)以三層堆疊之平面倒F型天線天線(PIFA)技術設計天線，以達縮小體積及多頻段操作的目標。
首先實作及驗證操作在無線醫療頻段之單頻膠囊內視鏡天線於模擬的胃中之可行性。繼之，以邊緣電場之電容效應之技術來設計及驗證寬頻的無線醫療頻段植入式天線，並同時模擬可直接連接至低功耗之射頻積體電路(RFIC)而省下匹配網路的方法。更進一步，實作及驗證應用於ZigBee(900 MHz及2.4 GHz) 系統之雙頻植入式天線。經由以上驗證，最後我們提出了堆疊式架構的平面倒F型天線，利用S型狀之輻射體，再結合兩層堆疊的雙螺旋型金屬片在三層基板上之四頻平面倒F型天線天線。該天線係以短路柱來連接第一、二層金屬片，以延長該天線兩個主要模態之有效電流路徑。藉由適當地控制此兩主要模態及其高階共振模態，可分別得到寬頻操作與四頻天線操作之特性。由文獻的比較，該植入式天線是唯一可以操作在四個頻段、可減少30%的體積、提供160%的寬頻及提高140%的增益等優點，因此也將更容易與植入式生物遙測系統結合與應用。
為了印證所設計天線之輻射效率，本文規劃在一般開放式、有各種外部雜訊的實際環境中，分別以網路分析儀、射頻訊號產生器、頻譜分析儀及ZigBee評估板分別連接植入式天線及外部單極天線，可由實測接收之功率值之結果，顯示本文提出的天線設計是符合實用之需求，並適合應用於多頻段生醫遙測系統之設計。

This dissertation presents the design of a novel multi-band antenna for implantable biotelemetry applications. In the previous literatures, most of the reported implantable antennas were designed for applying in single, dual, or triple frequency bands. Beside, these published antennas had the disadvantages of large volume, narrow bandwidth, low gain, and insufficient application bands. To meet the multiple purposes of the bio-telemetry applications in the future, the implantable antennas need to provide the functions of physiology information transmission, wireless powering, micro pump controlling, and system wake-up. In this dissertation, an implantable antenna with four application bands, compact size, and good performances is proposed for employing in Body Area Networks (BAN) below 3 GHz. The four application bands are Medical Device Radiocommunications Service band (MedRadio) (401-406 MHz), Wireless Medical Telemetry Service band (WMTS) (1427-1432 MHz), and two industrial, scientific, and medical bands (ISM) (433-434 MHz and 2.4-2.4835 GHz).
For achieving the miniaturization and broadband of the implantable antenna, the methods used in this study consist of (1) tuning fringe field capacitance effects to improve bandwidth; (2) changing probe feed position to increase impedance matching; (3) using three-layer stacked planar inverted F antenna (PIFA) to accomplish the goals of miniaturized volume and multi-band operation.
First, the feasibility of a capsule endoscope antenna operates in mimicking stomach at the MedRadio band is implemented and verified. Second, the implantable antenna uses fringe field capacitance effect to design and verify its characteristics of wideband and miniaturization at the MedRadio band. Meanwhile, this proposed antenna directly matched to a low power RFIC without RF matching network is verified by simulation. Third, the proposed implantable antenna applying in ZigBee dual band (900 MHz and 2.4 GHz) system is also verified. After confirming the functions of the three proposed antennas mentioned above, the final structure of the proposed design is constructed on a three-layer substrate including a PIFA antenna with an S-shaped radiated element and two stacked twin spiral stripes. The proposed design uses a shorting pin to connect layer 1 and layer 2, which lengthens the effective current path of the two primary resonances. After properly controlled the two primary resonances and their higher modes, the broad bandwidth and quad-band are obtained. By searching the existed designs, the proposed antenna is the only one that can operate in four operation bands, reduce 30 % in volume, provide 160 % wider bandwidth, and increase 140 % in gain. According to the advantages listed above, the proposed quad-band implantable antenna can easily be combined and applied with the biotelemetry systems.
To verify the radiated efficiency of proposed antennas, this dissertation sets up the antenna in an open environment with various kinds of RF interferences for practical measurements. The received power of the proposed antenna is measured through network analyzer, RF signal generator, spectrum analyzer, and ZigBee evaluation kit. According to the measured results, the proposed antennas present suitable performances and can be applied in implantable biotelemetry systems.

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