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研究生:黃勝義
研究生(外文):Sheng-Yi Huang
論文名稱:人體組織與天線間遠場電磁輻射效應之研究
論文名稱(外文):Study of Interaction Effect between Antenna Far-field Electromagnetic Radiation and Human Similar Tissue
指導教授:孫卓勳孫卓勳引用關係
口試委員:楊昌正莊清松林漢年徐敬文程光蛟李士修賴柏洲
口試日期:2012-10-05
學位類別:博士
校院名稱:國立臺北科技大學
系所名稱:電腦與通訊研究所
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2012
畢業學年度:101
語文別:英文
論文頁數:135
中文關鍵詞:SAR近場遠場天線電磁傳播
外文關鍵詞:SARNear-fieldFar-fieldAntennaand EM Propagation
相關次數:
  • 被引用被引用:1
  • 點閱點閱:200
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  • 下載下載:5
  • 收藏至我的研究室書目清單書目收藏:0
現今,對於SAR(Specific Absorption Rate)的評估皆以近場方式量測:利用電場探針,量測在人體組織內的電場強度;或是利用熱攝像儀,量測人體組織表面熱溫度。然而,以遠場量測方式評估,亦是值得研究的方式,其所測量的是電磁輻射能量的吸收。
本研究論文提出一種新的量測方式,以評估遠場whole-body SAR,其量測方式為:把輻射源(即天線)置於(1)自由空間;與(2)人體組織附近。由能量不滅定律可知:其輻射源的電磁輻射能量損失,大部分損失是由人體組織所吸收,少部分損失是在電磁傳播時損失。利用Wheeler Cap方法,量測得之電磁輻射能量的差以求出whole-body SAR。
本論文提出之遠場量測方式,經實際量測與模擬比較,其天線效率之相對誤差介於13 %至3 %間;而遠場whole-body SAR量測結果與ref. [4.9]相比較,其量測相對誤差為14 %。藉由實際量測評估電磁輻射能量對人體組織干擾之影響結果顯示,當輻射源-天線與人體頭部組織相距於170 mm,可減少70 %之電磁輻射能量對人體組織之影響程度。本論文提出之量測方式,具有以下優點:快速,省時,簡單。利用遠場量測系統與向量網路分析儀,快速收集所需的量測數據,減少量測時間的花費以評估遠場電磁輻射能量對人體組織之影響。


The Specific Absorption Rate (SAR) is generally evaluated by using the near-field measurement method, which is to measure the E-field strength deposited into the human similar tissue with the E-probe and/or to measure the thermal energy deposited on the surface of the human similar tissue with the thermal camera. Furthermore, it is worthy of studying the absorption of EM radiation energy deposited into the human similar tissue by using the far-field measurement system. Therefore, we propose a new measurement method to evaluate the far-field whole-body SAR, which is different from the near-field measurement method.
The far-field measurement method is considering the absorption limit of the EM radiation power absorbed by the human similar tissue. There are two process steps to evaluate the absorption limit: (1) Taking the far-field measurement system measures the EM radiation powers of a radiation source such as antenna placed in free space and in neighbor of phantom respectively. (2) Taking the Wheeler Cap method evaluates the lost EM radiation power. According to the law of conservation of energy, most of the lost EM radiation power is absorbed by the human similar tissue and a little portion is losing in the stage of EM propagation. Therefore, the far-field whole-body SAR can be calculated while the total radiated power and the input power of a radiation source are known.
The evaluated far-field whole-body SAR is compared to the ref. [4.9], which the relative error is within 14 %. According to the measured results, the EM radiation interaction effect can be greatly reduced approximately by 70 % when the separation distance of the EM radiation source and the human similar tissue is more than 170 mm. The measured results of the antenna efficiency are compared to the simulated results, which the relative errors are between 13 % and 3 %.
The proposed new method has the good advantages of simplicity, rapidity, and saving time, which means that a small quantity number of data collection is necessary to evaluate the interaction effect between antenna far-field EM radiation and human similar tissue. The measured results have the good agreement with the simulated results.


Abstract (English) ….i
Abstract (Chinese) ...iii
Acknowledgement ...iv
Contents ....v
List of Tables ..vii
List of Figures …x
Chapter 1 Introduction …1
1.1 Background and Motivation …1
1.2 Outline of the Thesis …5
Chapter 2 FDTD Basic Theory, Standard Regulation, and Methodology …7
2.1 Finite-Difference Time-Domain Formulation …7
2.1.1 Basic Theory of Numerical FDTD …8
2.1.2 The Solution of EM Field in Time and in Space
Arrangements …9
2.2 Definition of Far-field Region ..15
2.3 Standard Regulations and Measurement Process ..19
Chapter 3 Design and Analysis of Multiband Antenna Applied to Mobile
Devices for Wimax/WLAN Applications ..22
3.1 Measurement of Antenna Efficiency by Using the Wheeler Cap
Method ..24
3.1.1 Basic Theory and Measurement Process of the Wheeler Cap
Method ..24
3.1.2 An Improved Wheeler Cap Method for Antenna Efficiency
Measurement ..27
3.1.3 Johnston Antenna Efficiency Measurement Method ..33
3.1.4 Antenna Gain ..37
3.2 CPW-fed Broadband Double Printed F-shape Planar Radiators
Loaded Antenna for Wimax/WLAN Applications ..39
3.2.1 Antenna Design and Configuration ..40
3.2.2 Simulated and Measured Results ..46
Chapter 4 Interaction Effect between Antenna Far-field Electromagnetic
Radiation and Human Head Similar Tissue ..58
4.1 EM Radiation Interaction Effects between Human Head
Phantom and a Dipole Antenna in 1900 MHz ..60
4.1.1 Design for a Dipole Antenna Operated in 1900 MHz ..60
4.2 Evaluating EM Radiation Interaction Effects between Human
Head Phantom and a Dipole Antenna by Far-Field Measurement
System at 1900 MHz ..74
4.2.1 Construction of the Far-field Measurement Model ..75
4.2.2 Antenna Performances while Closing to the Human
Head Phantom ..85
4.2.3 Far-field Whole-body SAR Measurement 102
Chapter 5 Conclusion 118
References 120
Appendix A 128
List of Journal Paper 128
List of Conference Paper 129
Appendix B 130
S. Y. Huang, S. Y. Chen and J. S. Sun, "Far-Field Effects with Human Head Evaluation of EM Emission," WSEAS International Conference
on Applied Electromagnetics, Wireless and Optical Communications, Corful Island, Greece, pp. 47-51, August 23-25, 2005. 131


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