在本論文中，我們設計智慧型超穎材料來抑制手機對人頭的SAR 值(Specific Absorption Rate)。稱為智慧型超穎材料是因為天線附加上超穎材料後效能不會被大幅改變;當人頭靠近天線時超穎材料又能轉變特性成為帶拒(bandstop)濾波器來抑制電磁波的傳播，從而降低SAR 值。
首先我們針對GSM 900 頻段(890 MHz-960 MHz)設計一單頻超穎材料:單位晶胞大小為2 公分x 2 公分x 0.4 公分，使用3 個單位晶胞遮蔽手機PIFA 天線，在天線距離人頭15 釐米SAR 比沒加超穎材料之前降低29.12 %。
接著我們設計一操作在GSM 1800(1710 MHz-1880 MHz)頻段超穎材料，單位晶胞大小為1 公分x 1.95 公分x 0.4 公分，使用4 個單位晶胞遮蔽手機PIFA 天線，在天線距離人頭15 釐米的時候SAR 比沒加超穎材料之前降低40.2 %。
我們也設計一操作在GSM 900/1800 頻段的雙頻超穎材料，單位晶胞大小為2公分x 4 公分x 0.8 公分，使用9 個單位晶胞遮蔽手機PIFA 天線和接地面，在天線距離人頭15 釐米的時候SAR 於900 MHz 時降低25 %，於1800 MHz 時降低32.6%。

In the thesis, we propose an intelligent metamaterial to reduce the specific absorption rate (SAR) of cellular phone to phantom. We call our design intelligent
metamaterial because it will not affect the antenna performance greatly. When the antenna is close to the phantom, the metamaterial acts like a stopband filter, thus reducing the SAR.
We design a small metamaterial cell resonating at GSM 900 band, having 2 cm x 2cm x 0.4 cm in size. We use three cells to shield the PIFA antenna and the SAR is reduced by 29.12 % at a distance of 15 mm away from the phantom.
Then we design a metamaterial cell having 1 cm x 1.95 cm x 0.4 cm in size,operating in GSM 1800 band. We use four cells to shield the PIFA antenna and the SAR reduced by 40.2 % at a distance of 15 mm away from the phantom.
We also propose a dualband (GSM 900/1800) metamaterial having 2 cm x 4 cm x 0.8 cm in size. We use nine metamaterial cells to shield the dualband antenna and the ground，the SAR reduced by 25 % at 900 MHz and 32.6 % at 1800 MHz at a distance of
15 mm away from the phantom.

論文審定書 i
誌 謝 ii
摘 要 iii
Abstract iv
目 錄 v
圖 次 vii
表 次 xi
第一章 序論 1
1.1 SAR 值簡介 1
1.2 文獻探討抑制SAR 值技巧 2
1.3 超穎材料簡介 3
1.4 研究方法 4
1.5 論文大綱 5
第二章 設計GSM 900 頻段的超穎材料來抑制SAR 值 6
2.1 單位晶胞分析6
2.2 偶極天線加上超穎材料後表現8
2.3 偶極天線加上超穎材料後對於人頭SAR 值影響11
2.4 PIFA 天線加上超穎材料後表現 14
2.5 PIFA 天線加上超穎材料後對於人頭的SAR 值影響17
2.6 實作與討論19
第三章 設計GSM 1800 頻段的超穎材料來抑制SAR 值26
3.1 超穎材料單位晶胞分析26
3.2 偶極天線加上超穎材料後表現28
3.3 偶極天線加上超穎材料後對於人頭SAR 值影響 32
3.4 PIFA 天線加上超穎材料後表現33
3.5 PIFA 天線加上超穎材料後對於人頭SAR 值影響 36
3.6 實作與討論 38
第四章 設計雙頻(GSM 900/1800)頻段的超穎材料來抑制SAR 值45
4.1 超穎材料單位晶胞分析45
4.2 雙頻天線加上超穎材料後表現47
4.3 雙頻天線加上超穎材料後對於人頭SAR 值表現 50
4.4 實作與討論 55
第五章 結論 63
參考文獻 64

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