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研究生:薛閔聰
研究生(外文):Ming-Tsung Hsueh
論文名稱:植入式天線在無線網路路由器內之設計
論文名稱(外文):Design of Embedded Antennas in Wireless Router
指導教授:陳興義陳興義引用關係
指導教授(外文):Hsing-Yi Chen
學位類別:碩士
校院名稱:元智大學
系所名稱:通訊工程學系
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:68
中文關鍵詞:無線路由器偶極天線寬頻多重分碼存取多重輸入多重輸出隔離度平面倒F天線
外文關鍵詞:Wireless Router , Dipole antenna , WCDMA , MIMO , Isolation , PIFA
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本論文主要研究課題為針對天線整合在無線路由器(Router)內的電磁相容/干擾問題。首先的課題研究壹印刷式雙頻偶極天線被內建在一寬頻多重分碼存取(Wide band Code Division Multiple Access ,WCDMA)無線路由器裡的最佳位置。研究過程在空氣與在路由器內的天線模擬逆向損耗(Return loss)與輻射場型均經由實驗量測證其準確度。從模擬結果及量測數據中發現天線與主機板間的距離會大大的影響被內建後的天線阻抗匹配、頻寬、工作頻率、與輻射場型。從研究經驗建議天線在設計上至少得離主機板約1/10波長以上的距離方能得到較好天線的功能。接著課題為研究整合
於無線路由器中內多重輸入多重輸出(Multi-input and multi-output, MIMO)天線隔離度的改善研究。天線設計方式為在系統主機板上方建立兩根PIFA(planer inverted-F antenna)天線。操作頻率均為WLAN 2.4 GHz(IEEE 802.11b、g、n)中所規定的規範。在接地板槽孔內部邊緣及接地板外部邊緣長出額外的四根寄生元件(Parasitic elements),將兩天線彼此的耦合電流引導到寄生元件上,使同頻率天線的隔離度(Isolation)可以在-25dB以下,並且天線還能維持住不錯的效能(Antenna efficiency)及增益(Peak gain)。路由器整合後天線後,天線的逆向損失、隔離度、工作頻率、電流分佈、輻射場型在本論文中報告。


The research topics of this thesis are focused on the electromagnetic compatibility and interference programs due to antennas integrated inside wireless routers. At beginning, The optimum location is studied for an embedded dual-band dipole antenna operating in two frequency bands of 824~894 MHz (WCDMA band V) and 1910~2170 MHz (WCDMA band I) mounted on the inner walls of a WCDMA router. Obtained numerical results of return losses and radiation patterns of the antenna in free space and inside the router are validated by measurement data. From simulation results and measurement data, it is found that the impedance matching, bandwidth, operating frequency, and radiation pattern of the antenna mounted on the inner walls of the WCDMA router is strongly affected by the distance between the antenna and the PCB. The simulations and measurements indicate that the distance between the antenna and the PCB should be kept at least 0.1 wavelength in order to obtain a good antenna performance. Then the improvement of antenna isolation is investigated for two MOMO antennas integrated inside a wireless router. The design structure is to build two planer inverted-F antenna (PIFA) right above the printed circuit board(PCB). The operating frequency of 2.4 GHz. PIFA is regulated by the IEEE 802.11b, g, n for WLAN applications, four parasitic elements are constructed in the sides of inner slot and outer rings of the ground plate. The coupled currents flowing on the two PIFA are conducted in these four parasitic elements. The antenna isolation is improved below -25dB through the arrangement of these four parasitic elements. The antenna efficiency and peak gain are also improved. After integrating the antenna with the wireless router, the antennas return loss, isolation, operating frequency, current distributions, and radiation pattern will meet the requirements regulated by the IEEE 802.11b, g, n also presented in this thesis.

中文提要………..……….……………………………………………….I
英文提要……….………………………………..……………………..III
誌謝……….…..……………………………………..……………….....V
目錄………..……………………………………...…………………....VI
圖目錄………..……………………………………………………….VIII
表目錄………….…………………………….……………………....XIV

第一章 介紹…………………………………………………….…..1
1-1 研究動機 ……………………..…………………………………....1
1-2 研究目的……………….…………………………………………... 2
1-3 設計方法與製作…….………………………………………………3
1-4 章節概述 ……………….…………………………………………..4
第二章 無線系統規範與天線理論……………………………..5
2-1 引言………………………...………………………………….…. 5
2-2 802.11 n 無線區域網路……………………………………….…. 5
2-3 通用移動通訊系統(UMTS)………………………………….……7
2-4 偶極天線原理….………………….……………………………….9
2-5 PIFA天線原理………….………………………..……………… 12
2-6 結論……………………………………………………….………16
第三章 寬頻多重分碼存取路由器內植入式雙頻偶極天線
最佳位置設計………………………………….….…… 17
3-1 引言………………………………………………………..……...17
3-2 無線路由器與印刷式雙頻偶極天線之介紹…………….………18
3-3 模擬結果及實驗數據…………………………………….………25
3-4. 結論……………………………………………………....………40
第四章 兩多重輸入多重輸出天線植入無線路由器內高隔
離度之結構設計………………………….……………...41
4-1 引言………………………………………………………….……..41
4-2 無線路由器與天線的隔離度及阻抗匹配的設計………….……..43
4-3 模擬結果與實驗數據……………………………………….……..49
4-4 結論………………………………………………………….……..64
第五章 總結……………………………………..……………...……65
參考資料……………………………………………..……….….……67


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