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研究生:高瑞彰
研究生(外文):Jui-Chang Kao
論文名稱:寬頻與雙頻操作的平面天線之研究
論文名稱(外文):A Study on Dual-Band and Wideband Planar Antennas
指導教授:詹正義詹正義引用關係
指導教授(外文):Jen-Yea Jan
學位類別:碩士
校院名稱:國立高雄應用科技大學
系所名稱:電子與資訊工程研究所碩士班
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:2007
畢業學年度:95
語文別:中文
論文頁數:154
中文關鍵詞:寬頻雙頻槽孔槽孔環單極平面天線
外文關鍵詞:widebanddual-bandslotslot ringmonopoleplanar antenna
相關次數:
  • 被引用被引用:3
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隨著無線通信中應用的普及,雙頻和寬頻天線之需求因而大幅增加,因此在本論文中,首先將提出共面波導饋入具有斜坡接地面之T型雙寬頻平面單極天線,先由運用電磁模擬軟體,了解其基本特性後,將其製作完成,並且比較且討論模擬與實驗時的結果。依循前一節的設計理念,接著採用的是對稱的斜坡接地面及標記型金屬輻射面的結構,藉由不同角度的金屬輻射面的變化也可以達到形成雙寬頻天線的操作。
基本上,典型微帶線饋入之槽孔天線操作在其共振模態,當在槽孔之中植入開口正方形金屬環時,則會造成雙頻模態的操作。研究成果發現,可以在低頻模態變動量極小之下大幅改變高頻模態的操作頻率中心,其中心頻率比變化為1.41~1.97之間。當又在槽孔之中植入開口更大之正方形金屬環做為雙頻模態的操作。可以在高頻模態變動量極小之下大幅改變低頻模態的操作頻率中心,其中心頻率比變化為1.49~1.85之間。
此外,又提出了一具有偏移的微帶線饋入之近似菱形寬頻印刷槽孔天線,藉由改變與微帶饋入線垂直的單邊菱角的角度來增加所要的操作頻寬,並且利用微帶饋入線之偏移和使用頂部具有圓形的微帶饋入線,以達到最佳寬頻的結果。接著,提出一個新的設計理念,利用方形槽孔環與菱形槽孔的結合以期望能夠達到更寬頻的效益。主要是利用方形槽孔環與菱形槽孔的結合以期望能夠達到更寬頻的效益,但考慮於天線尺寸的大小與方形槽孔環和菱形槽孔的結合尺寸,所以希望是採用菱形槽孔的主模態和矩形槽孔環的二次模態或三次模態來做結合,一方面所共振出的模態較為相近比較有構成寬頻的現象產生,另一方面整體天線的尺寸也不用因此提高許多。接續上一章節所提出的方法來改變應用,提出一個新的設計理念,以典型微帶線饋入之菱形槽孔天線為基本,並在槽孔之外植入另一矩形槽孔環,以期望能夠達到降低交叉極化的效益。
Due to the dramatically increasing of dual-band and wideband application in wireless systems, the demands of wideband antennas thus increase drastically. So, in this thesis, the CPW-fed dual-broadband T-type planar monopole antenna has been proposed at first. The use the electromagnetic simulation software can analyze antenna’s characteristics to help for further antenna designs. According to the idea of the previews design, the following CPW-fed dual-broadband tab-shaped planar monopole antenna is proposed. By varying the angle of this tab-shaped radiator, the dual-broadband operation can be obtained.
Basically, the conventional microstrip-line-fed slot antenna has its resonant mode. By embedding an open square-ring, it is found that the dual-band operation can be achieved. From studied results, the operating frequency of the higher mode can be shifted and than the frequency ration of the two resonant modes has a range of 1.41~1.97. Furthermore, as the embedded square-ring is opened more large, the dual-band operation can be also obtained. The frequency ratio has a range of 1.44~1.85 because of the lower mode can be shifted mainly.
Next, a wideband rhombus-like planar slot antenna with an offset microstrip feed line are proposed and experimentally studied. By varying the angle at the right part of this rhombus-like slot and selecting the proper offset distance, it is found that the impedance bandwidth of the proposed antenna can be enhanced. In order to improve antenna’s bandwidth, another proposed slot antenna with the combination of square-ring and rhombus slots is proposed. In this design, the fundamental mode of rhombus slot and the higher mode of square-ring slot are excited simultaneously. Then the antenna size would not be influenced. From studied results in those slot antenna, it is found that the performance of the cross-polarization levels radiation patterns is not good because of the use of wide slot. In order to reduce the cross-polarization levels, a rhombus slot antenna enclosed by a square-ring slot is proposed. It is seen that cross-polarization levels can be reduced.
摘要 i
Abstract iii
目錄 v
表目錄 vii
圖目錄 ix
第一章 前言 (Introduction) 1
1.1概述 1
1.2文獻導覽 2
1.3內容提要 3
第二章 雙寬頻的單極平面天線 (Dual-Broadband Monopole Planar Antennas) 5
2.1概述(Introduction) 5
2.2共平面波導饋入具斜坡接地面之T型雙寬頻平面單極天線
(CPW-Fed Dual-Broadband T-Type Planar Monopole Antenna with a Slope Ground Plane) 7
2.2.1實驗結果與討論 8
2.3共平面波導饋入具斜坡接地面之標記型雙寬頻平面單極天線
(CPW-Fed Dual-Broadband Tab-Shaped Planar Monopole Antennas With a Slope Ground Plane) 10
2.3.1實驗結果與討論 12
2.4結論(Conclusions) 14
第三章 雙頻的槽孔平面天線 (Dual-Band Planar Slot Antennas) 44
3.1概述(Introduction) 44
3.2微帶線饋入具有開口正方形金屬環的雙頻平面槽孔天線(Ⅰ)
(Microstrip-Line-Fed Dual-Band Planar Slot Antenna with Open Square Metal Ring (Ⅰ)) 45
3.2.1實驗結果與討論 46
3.3微帶線饋入具有開口正方形金屬環的雙頻平面槽孔天線(Ⅱ)
(Microstrip-Line-Fed Dual-Band Planar Slot Antenna with Open Square Metal Ring (Ⅱ)) 48
3.3.1實驗結果與討論 49
3.4結論(Conclusions) 51
第四章 寬頻的印刷槽孔天線 (Wideband Planar Slot Antennas) 69
4.1概述(Introduction) 69
4.2微帶線饋入之近似菱形寬頻印刷槽孔天線
(Microstrip-Line-Fed Wideband Rhombus-Like Planar Slot Antenna) 71
4.2.1實驗結果與討論 71
4.3微帶線饋入具有方形槽孔環與菱形槽孔寬頻的槽孔天線
(Microstrip-Line-Fed Wideband Slot Antenna with Rhombus and Square-Ring Slots) 75
4.3.1實驗結果與討論 77
4.4使用矩形槽孔環以降低交叉極化之菱形槽孔天線
(Reduction of Cross-Polarization for a Rhombus Slot Antenna Enclosed by a Square-Ring Slot) 82
4.4.1實驗結果與討論 83
4.5結論(Conclusions) 87
第五章 結論 (Conclusions) 126
參考文獻 (References) 129
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