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研究生:吳承祐
研究生(外文):Cheng-Yu Wu
論文名稱:應用於WLAN頻段之輻射場型分集小型化MIMO天線
論文名稱(外文):Design of A Compact MIMO Antenna with Pattern Diversity Technique for WLAN Application
指導教授:孫卓勳孫卓勳引用關係黃榮堂黃榮堂引用關係
指導教授(外文):Jwo-Shiun SunJung-Tang Huang
口試委員:莊清松鄭瑞清
口試日期:2016-07-11
學位類別:碩士
校院名稱:國立臺北科技大學
系所名稱:機電整合研究所
學門:工程學門
學類:機械工程學類
論文種類:學術論文
畢業學年度:104
中文關鍵詞:輻射場型分集多輸入多輸出無線區域網路
外文關鍵詞:Pattern DiversityMIMOWLAN
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本論文提出應用於WLAN頻段之輻射場型分集小型化MIMO天線的設計,將兩對稱之倒F型天線元件距離為7 mm,採背對背方式排列成為MIMO天線陣列結構,天線輻射體上共切割出兩個共振路徑使天線達到雙頻特性,分別是較長部份為2.45 GHz的共振路徑及較短部分為5.5 GHz的共振路徑。並且透過調整左右兩邊之接地面結構,增強此MIMO天線的輻射場型分集效果,進而提升隔離度。
MIMO天線之S11量測結果為低頻與高頻頻率範圍分別是2.39 GHz - 2.56 GHz及5.23 GHz - 5.68 GHz,而S21量測結果為在低頻段之隔離度為-18.8 dB及高頻段之隔離度為-23.09 dB。透過3-D OTA Chamber量測實際輻射增益與輻射效率,並且實測之輻射場型在低頻段輻射增益約5.1 dBi及輻射效率約70%,在高頻段輻射增益約4.2 dBi及輻射效率約74%,最後用3D輻射場型計算天線陣列之相關係數,在低頻段為0.17而高頻段為0.18,其計算結果表示本論文所設計出之MIMO天線在操作頻段上擁有低之相關係數,適合應用在無線通訊產品上。
A compact MIMO Antenna with pattern diversity technique for WLAN application has been presented in this thesis. Two symmetric inverted-F antenna elements, of which layout is back to back and has an inter-element distance of 7 mm, is combined to MIMO antenna mechanism. The antenna element structure is organized with two branches in the inverted-F type. One of the branch is longer than the other, and has effective quarter wavelengths of 2.45 GHz and 5.5 GHz, respectively. Enhancement to pattern diversity of the MIMO antenna will generate to high isolation at close inter-element distance, through changing to the both side ground plane configuration.
The parameter S11 of the MIMO antenna gives a result from 2.39 GHz - 2.56 GHz and 5.23 GHz - 5.68 GHz, respectively. The parameter S21 of MIMO antenna shows a result -18.8 dB and -23.09 dB in the lower and higher frequency band, respectively. The radiation gain and efficiency are measured by 3-D OTA chamber. A radiation gain of 5.1 dBi and a radiation efficiency of 70 % was measured result in the lower frequency band. A radiation gain of 4.2 dBi and a radiation efficiency of 74 % was measured result in the higher frequency band. The calculated correlation coefficient is 0.17 and 0.18 at 2.45 GHz and 5.5 GHz, hence, the experiment result shows the MIMO antenna can be efficiently operated for wireless communication products.
中文摘要 i
英文摘要 ii
誌謝 iv
目錄 v
表目錄 vi
圖目錄 vii
第一章 緒論 1
1.1 研究背景 1
1.2 研究動機 2
1.3 論文大綱 3
第二章 理論基礎 5
2.1 多輸入多輸出無線接取技術之基本概述 5
2.2 微波分集技術 9
2.3 OTA量測機制 11
第三章 雙頻段MIMO天線設計 14
3.1 單一天線元件設計 14
3.1.1 參數模擬及分析 15
3.1.2 實際量測結果 21
3.2 MIMO天線設計 25
3.2.1參數模擬及分析 26
3.2.2 實際量測結果 33
第四章 輻射場型分集之MIMO天線 42
4.1 近距離MIMO天線設計 42
4.1.1 參數模擬及分析 43
4.1.2 實際量測結果 49
4.2 輻射場型分集MIMO天線設計 55
4.2.1 參數模擬及分析 56
4.2.2 實際量測結果 64
第五章 結論與未來展望 73
參考文獻 75
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