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研究生:陳昱瑋
研究生(外文):Yu-Wei Chen
論文名稱:超寬頻天線之雙抑制頻段設計
論文名稱(外文):Design of an ultra-wideband antenna with dual band-notched characteristic
指導教授:程光蛟孫卓勳孫卓勳引用關係
指導教授(外文):Kwong-Kau TiongJwo-Shiun Sun
學位類別:碩士
校院名稱:國立臺灣海洋大學
系所名稱:電機工程學系
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:2011
畢業學年度:99
語文別:中文
論文頁數:84
中文關鍵詞:微帶線饋入單極天線超寬頻天線抑制頻段
外文關鍵詞:Microstrip line-fedMonopole Antennaltra-wideband AntennaBand-rejected ( band-notched )
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本論文提出具雙抑制頻段之超寬頻單極天線,天線設計均使用FR4板材以及微帶線饋入的方式,其天線之金屬輻射面是使用六邊形的方式設計,利用金屬輻射面底端的截角和接地面頂端的截角,所產生的斜向電流,來改善阻抗匹配達到超寬頻的需求,整個實際量測的頻寬範圍從2.86 ~ 11.40 GHz均在-10 dB 以下,本論文所提出之天線結構能滿足FCC對於超寬頻系統所規範的頻段( 3.1 ~ 10.6 GHz );延續上述的超寬頻天線結構,為了避免與WiMAX 3.5/5.5 GHz ( 3.3 ~ 3.8 GHz / 5.25 ~ 5.85 GHz ) 和WLAN 5.2/5.8 GHz ( 5.15 ~ 5.35 GHz / 5.725 ~ 5.825 GHz ) 共存的頻段產生互相干擾,因此於天線之金屬輻射面中央嵌入一個倒U型的槽孔可共振出低頻3 GHz 的抑制效果,以及嵌入一對倒L型槽孔可共振出高頻5 GHz 的抑制效果,將可確保超寬頻系統運作時的穩定性。最後,本論文所提出的超寬頻天線,具有低成本、結構簡單、實作容易以及具備單極天線場型特性等優點,符合商業化的需求。
The purpose of this thesis is to design a compact ultra-wideband monopole antenna with dual stopbands function. The antenna is printed on FR4 substrate with a thickness of 0.8 mm and relative permittivity of 4.4. The planar monopole antenna is constructed on a hexagon patch utilizing the bevel edge to produce the transverse current distribution. Two bevel edges in the antenna base plate and ground top plate have been constructed to improve the impedance matching capability. As a result, the measurement less then - 10 dB for the bandwidth ranged from 2.86 ~ 11.40 GHz can be achieved. The proposed antenna can satisfy the FCC specification for UWB system frequency band (3.1 ~10.6 GHz) and have the dual stopbands to avoid interferences between UWB system and existing WiMAX in the 3.5/5.5 GHz ( 3.3 ~ 3.8 GHz / 5.25 ~ 5.85 GHz ) band and WLAN in the 5.2/5.8 GHz ( 5.15 ~ 5.35 GHz / 5.725 ~ 5.825 GHz ) band. Further designs including the insertion of an inverted U-shaped slot and a pair of inverted L-shaped slot in the metal radiating surface to suppress the low resonant frequency at 3 GHz and the higher resonant frequency at 5 GHz were implemented respectively. The added design exhibit stable operation of the UWB system. The proposed antenna is suitable for commercial use due to their compact size, simple structure, low cost and monopole-like radiation pattern.
中文摘要 i
英文摘要 ii
誌謝 iv
目錄 v
圖目錄 vii
表目錄 ix
第一章 序論 1
1.1 研究背景 1
1.2 研究動機與目的 4
1.3 超寬頻系統簡介 5
1.4 內容提要 10
第二章 天線理論與文獻回顧 12
2.1 偶極天線 12
2.2 單極天線 17
2.3 文獻回顧 20
第三章 超寬頻單極天線設計 24
3.1 天線設計 24
3.2 結果與討論 26
3.3 天線結構之參數分析 37
3.3.1 改變輻射面斜邊長度L1之參數變化 38
3.3.2 改變輻射面斜邊寬度W1之參數變化 39
3.3.3 改變接地面斜邊長度L2之參數變化 41
3.3.4 改變接地面斜邊寬度W2之參數變化 42
第四章 具有雙抑制頻段之超寬頻單極天線設計 44
4.1 天線設計 44
4.2 結果與討論 46
4.3 天線結構之參數分析 58
4.3.1 改變倒U型槽孔寬度W3之參數變化 59
4.3.2 改變倒U型槽孔長度L3之參數變化 61
4.3.3 改變倒L型槽孔寬度W4之參數變化 62
4.3.4 改變倒L型槽孔長度L4之參數變化 64
第五章 結論 66
參考文獻 68


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