因無線網路發展，智慧型手機與平板電腦流行。城市裡也都開始發展區域無線網路來節省空間，方便性來越好。然而，無線產品的使用過程中，產生出來的電磁輻射對人體的影響也成為電磁相容( EMC )的研究方向。本論文主要研究設計，具有高阻抗表面結構的電磁防護片與天線應用於WLAN頻段( 2.45 GHz，5.25 GHz )來探討其整體的電磁相容應用。並使用Ansoft HFSS電磁模擬軟體，設計高阻抗表面結構與單極天線並統整兩者的特性後，使用拱型號角天線量測系統來對HIS做量測。過程中設計一個WLAN雙頻系統的單極天線與高阻抗表面結構後，探討天線特性如：天線反射係數、天線輻射場型、整體輻射功率( Total Radiated Power，TRP )、水平輻射功率等。且希望利用高阻抗表面結構優化天線的效果，並降低電磁輻射對人體的影響。本文也建立人體頭部模型分析特定吸收率(SAR )值，與加上電磁防護片之天線是否能達到法規的限制值，分析頭部模型對天線的影響。最後與其它電磁防護片比較，以探討高阻抗表面結構在電磁防護片的實用層面上的價值。

In recently years, smart phones and tablet PCs have become more and more popular because of the fast development of wireless networks. Because of the almost ubiquitous wireless local area networks (WLANs) in urban areas, more and more wireless products support the communication through WLANs. These wireless products will be inevitable to generate electromagnetic waves that may cause adverse effects on human bodies. Hence, how to reduce undesirable electromagnetic radiations has become an important research topic in the area of electromagnetic compatibility (EMC).
The thesis proposes a dual-band electromagnetic protection sheet that can be used for the 2.45- and 5.25-GHz WLAN applications. The proposed electromagnetic protection sheet, which is a high-impedance surface (HIS), can be used in conjunction with a dual-band antenna to reduce the radiation in undesired directions while not to downgrade the radiation in the desired direction.
The dual-band monopole antenna and dual-band HIS were both designed using the simulator Ansoft HFSS. The reflection coefficient, radiation pattern, total radiated power (TRP), horizon radiated power (HRP), and near-horizon partial radiated power (NHPRP) are all simulated with and without the presence of the HIS. To verify that the designed dual-band monopole antenna in the presence of the dual-band HIS can indeed reduce adverse effects on human bodies, we established a human-head model to simulate the specific absorption rate (SAR). The resulting SAR values are found to be lower than the limits specified by the regulations. In comparison with other types of electromagnetic protection sheets, it is also found that HISs are more valuable in practical applications.

中文摘要…………………………………………………...…………………...…. I

英文摘要………………………………………………………...…………...……. II

誌謝…………………………………………………………...………………….... IV

目錄………………………………………………………………...……………… V

表目錄………………………………………………………………...…………… VII

圖目錄…………………………………………………………………...………… IX

第一章　緒論……………………………………………………………...……… 1
1-1 研究動機與目的……………………………………………...…….. 1
1-2 文獻回顧………………………………………………………...….. 2
1-3 論文架構………………………………………………………......... 3
第二章　高阻抗表面結構………………………………………………………... 4
2-1高阻抗表面結構基本理論…………………………………………... 4
2-2高阻抗表面結構之幾何元件………………………………………... 5
2-3應用於WLAN頻段雙頻高阻抗表面結構設計…………………...... 6
2-4雙頻高阻抗表面結構量測…………………………………………... 16
2-5雙頻高阻抗表面結構於不同電磁波入射之反射相位比較………... 19
第三章　高阻抗表面結構於雙頻單極天線之應用……………………………... 23
3-1應用於WLAN頻段雙頻單極天線設計…………………………...... 23
3-2雙頻天線加上高阻抗表面結構之架構……………………………... 32
3-3雙頻天線加上高阻抗結構之天線特性探討………………………... 35
3-3.1雙頻單極天線反射係數S_11……………………………......... 35
3-3.2整體輻射功率(Total Radiated Power，TRP)……………....... 40
3-4天線加上高阻抗結構之SAR值探討……………..………………… 44
3-4.1特定吸收率…………………………………...…………....... 45
3-4.2模擬架構………………………………………..…………… 49
3-4.3模擬結果…………………………………………..………… 51
第四章　雙頻高阻抗結構與電磁防護片特性比較……………………...……… 53
4-1電磁防護片……………………………………………………..……. 53
4-2天線加上電磁防護片之特性……………………………………....... 55
4-2.1反射係數、場型……………………………………………… 55
4-2.2整體輻射功率……………………………………………...... 68
4-2.3特定吸收率(SAR)………………………………………....... 70
第五章　結論……………………………………………………………………... 72
參考文獻…………………………………………………………………………... 74

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