運用FDTD法探討溼度在長距離下對RF傳輸的影響

Using FDTD Method To Discuss The Influence Of Humidity In Long Distance RF Transmission

吳文鈞(Wen-Juin Wu)

指導教授 ： 李宗翰 ； 黃曼菁

淡江大學/工學院/機械與機電工程學系碩士班/碩士(2011年)

https://doi.org/10.6846/TKU.2011.00573

摘要

無線傳輸裝置的廣泛應用改善了人與人的溝通以及人與環境的變遷，透過無線射頻的技術，增加生活的便利性。近年來RF無線射頻系統已被廣泛地運用於日常生活中。並且由於行動電話基地台等電磁波對人體所造成之影響日趨受到重視，使得各生醫研究單位積極投入探討人體與電磁波間之交互作用，以及其所造成之影響。
近年來RFID更廣泛應用於生醫裝置的應用上，而人體各部組織裡，大都靠水來支持，水分就佔了人體全身的70%，所以如果要研發體內植入式生醫裝置的話，水分子吸收無線電波的因素是不可忽略的。
本研究主要探討以運用時域有限差分法（FDTD）建立之人體電磁場模型，模擬人體在環境變數設定下傳輸射頻之能量，調整其發射功率及觀察其接收功率之傳輸情形，求得變化環境下之功率、頻率、距離與標準SAR值之最佳使用效能，對於植入式生醫裝置的環境設置上能提供參考，以得到最佳之接收效率。

關鍵字

無線射頻技術 ； 時域有限差分法 ； 植入式生醫裝置

並列摘要

The popularity of wireless transmission technology has improved the efficiency of communication and information in daily life, the radio frequency transmission provides the conveniences and the feasibility of environment. In recent years, the RF wireless radio frequency system has been widely utilized in the daily life. As the mobile phone stations send out electromagnetic waves which may cause damages to human body, many research organizations have conducted relative researches to find out the interactive function between human body and electromagnetic waves.

In recent years, RFID is more widely used in biomedical device applications. The human body contains 70% of water, this is an important factor that can not be ignored because the water molecules absorb radio waves and malfunction to implantable biomedical devices.

Radio frequency technology can be built into an implantable bio-medical device to provide the device energy, to transmit the feedback signals and parameters, and to send out the instant and accurate physiological information. The simulation experiment of radiofrequency transmission via finite difference time domain method (FDTD) is conducted in this study to analyze humidity effects under various environments and adjust its transmission power , distance and frequency to achieve the maximum efficiency of receiver and best SAR performance.

並列關鍵字

Radio frequency technology, ； the FDTD method ； Implantable bio-medical device

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