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中文論文名稱 運用FDTD法探討溼度在長距離下對RF傳輸的影響
英文論文名稱 Using FDTD Method To Discuss The Influence Of Humidity In Long Distance RF Transmission
校院名稱 淡江大學
系所名稱(中) 機械與機電工程學系碩士班
系所名稱(英) Department of Mechanical and Electro-Mechanical Engineering
學年度 99
學期 2
出版年 100
研究生中文姓名 吳文鈞
研究生英文姓名 Wen-Juin Wu
學號 697370434
學位類別 碩士
語文別 中文
口試日期 2011-06-16
論文頁數 55頁
口試委員 指導教授-李宗翰
指導教授-黃曼菁
委員-沈燕士
委員-洪祖昌
中文關鍵字 無線射頻技術  時域有限差分法  植入式生醫裝置 
英文關鍵字 Radio frequency technology,  the FDTD method  Implantable bio-medical device 
學科別分類 學科別應用科學機械工程
中文摘要 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。
英文摘要 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.

論文目次 目錄
中文摘要………………………………………………………..………I
英文摘要…………………………………………………………….….III
目錄……………………………………………………………………...V
圖目錄………………………………………………………………….VII
表目錄………………………………………………………………...VIII
第一章 序論……………………………………………………………..1
1-1、研究動機…………………………………………………….…1
1-2、研究目的………………………………………………………..3
第二章 研究背景……………………………………………………… .4
2-1、植入式生醫裝置相關研究…………………………………….4
2-2、生物電磁學之相關研究………………………………………8
2-3、電子標籤的設計分析………………………………………….12
2-4、屏蔽之機械理論………………………………………………15
第三章 研究方法………………………………………………………19
3-1、時域有限差分法………………………………………………19
3-1-1、基本概念…………………………………………………20
3-1-2、Yee氏網格體系………………………………………….23
3-2、激發源的處理…………………………………………………25
3-3、吸收邊界條件﹙Absorbing Boundary Condition﹚………….26
第四章 實驗設計與分析………………………………………………28
4-1、實驗設計方法………………………………………………….28
4-2、實驗模擬規劃…………………………………………………32
4-2-1、天線位置示意圖…………………………………………35
4-2-2、實驗規劃………………………………………………….36
第五章 實驗結果與討論………………………………………………37
5-1、濕度空間之傳輸驗證………………………………………..37
5-2、RF模擬實驗分析…………………………………………….43
第六章 結論與未來方向………………………………………………48
6-1、結論……………………………………………………………48
6-2、未來展望……………………………………………………..50
參考文獻………………………………………………………………..51

圖目錄
圖2-1 BION計畫之植入式生醫裝置…………………….…………….6
圖2-2 電磁波進入屏蔽時…………………………….……………….15
圖3-1 FDTD電磁場計算時間步階圖…………………………………21
圖3-2 Yee氏網格……………………………………………………….23
圖4-1 傳輸功率與取距離的關係圖…………………………………..34
圖4-2 天線置放位置………………………………………………..…35
圖5-1 天線置放位置…………………………………………………..37
圖5-2 環境包覆情況…………………………………………………..37
圖5-3 RF傳輸實驗的常態機率圖…………………………………….47
圖5-4 RF傳輸實驗對實驗順序的殘差圖……………………………47

表目錄
表2-1 生物組織電磁參數……………………………………………10
表2-2 生物組織電磁參數……………………………………………11
表2-3 組織器官含水比例……………………………………………14
表2-4 相對介電常數…………………………………………………17
表4-1 濕度與導電系數關係…………………………………………33
表5-1 純真空環境下之人體SAR值(A)………………………………38
表5-2 包覆環境下之人體SAR值(B)…………………………………39
表5-3 兩方法比較之誤差值…………………………………………41
表5-4 RF傳輸SAR值異變分析……………………………………….44
表5-5 RF傳輸1g-SAR值異變數分析…………………………………45
表5-6 RF傳輸10g-SAR值異變數分析………………………………46
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