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研究生:劉倚函
研究生(外文):Liu, IHan
論文名稱:適用於LTE/WWAN之多天線隔離度設計
論文名稱(外文):Isolation Design of MIMO Antenna for LTE/WWAN Applications
指導教授:林淑芸林原誌林原誌引用關係
指導教授(外文):Lin, ShunyunLin, Yuanchih
口試委員:林淑芸林原誌陳文祥張法憲邱宗文
口試委員(外文):Lin, ShunyunLin, YuanchihChen, WenshyangChang, FashianChiu, Tsungwen
口試日期:2012-07-21
學位類別:碩士
校院名稱:正修科技大學
系所名稱:電子工程研究所
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:2012
畢業學年度:100
語文別:中文
論文頁數:57
中文關鍵詞:U 型迴圈近場抵消多輸入多輸出天線偶極天線隔離度
外文關鍵詞:U-shaped loopfield cancellation clearly reducesMIMO antennaLTEdipole antennaIsolation
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本論文提出一種新型之短路機制,可改善多輸入多輸出天線之隔離度設計概念,主要應用於筆記型電腦。第一種設計提出一款半波長U型迴圈天線,操作於 LTE 2500 MHz頻帶,本設計利用輻射耦合與傳導耦合反向電流,產生兩天線之間的近場抵消,藉以降低兩個近距離天線間的相互耦合。第二種設計為一款具有分支接地之新型天線,操作於LTE700/WWAN 850/900/1800 /1900/UMTS2000 MHz 等頻段,天線結構主要包含倒L型金屬微帶線與分支接地,其中倒L型金屬微帶線可於高頻頻帶產生一模態,而分支接地與倒L型金屬微帶線則組成短路式偶極天線,並在低頻與高頻頻帶各產生一共振模態,達到雙共振模態的效果。新型分支接地結構係從接地面延伸出所需頻段之共振路徑,縮短低頻段路徑的長度,進而在有限的空間內增加天線的間距以提升隔離度,並藉由分支接地結構的短路機制有效將天線與週圍之金屬元器件等電位化,達成良好的隔離效果。上述二款設計,均佐以理論模擬與實際量測,藉以驗證天線的效能,實驗結果顯示本論文所提出的新型之短路機制設計,能有效提升近距離天線間的隔離度與增加通道容量。
This thesis presents novel techniques for isolation enhancement between two closely packed antennas. The first design operates in Long Term Evolution (LTE) 2500 MHz. The element of the proposed Multiple-Input Multiple-Output (MIMO) antenna consists of a polygonal loop and an L-shaped ground plane. Due to the two coupling-currents, which are caused by radiation emission and conduction emission and which are 180° out of phase, field cancellation clearly reduces mutual coupling between the closely packed antenna elements. The second design mainly consists of an inverted L-shaped metal microstrip line and a branch ground. This design operated in bands of LTE700/WWAN quad-band. The extended portion of antenna ground lengthens the resonance path at lower frequency,which introduces a compact antenna structure and increases the space between two closed antennas. The simulative study and experimental study are carried out to verify the performances of the proposed MIMO antennas.
文字目錄
中文摘要 ............................................................................................................................... II
英文摘要 .............................................................................................................................. III
文字目錄 ............................................................................................................................... V
圖形目錄 .............................................................................................................................. VI
表格目錄 ............................................................................................................................ VII
第 一 章 序 論 (Introduction) ...................................................................................... 2
1.1 研究動機 ................................................................................................................. 2
1.2 文獻導覽 .................................................................................................................. 4
1.3 論文提要 .................................................................................................................. 5
第 二 章 倒U 型迴圈天線之近距離隔離度研究(Close the Isolation of the Inverted
U-shaped Loop Antenna) ................................................................................................ 7
2.1 天線設計與原理 ..................................................................................................... 8
2.2 MIMO 系統延伸研究 ......................................................................................... 11
2.3 心得與討論 ........................................................................................................... 21
第 三 章 一種新型分支接地應用於LTE 三頻設計 (A Novel Branched-ground for LTE
Triple-band Application) .............................................................................................. 22
3.1 天線設計與原理 ................................................................................................... 22
3.2 實驗結果與分析 ................................................................................................... 25
3.3 心得與討論 ........................................................................................................... 41
第 四 章 適用於LTE/WWAN 之多天線隔離度設計 (Isolation Design of MIMO
Antenna for LTE/WWAN Applications) ......................................................................... 22
4.1 MIMO 系統延伸研究 ........................................................................................... 43
4.2 心得與討論 ............................................................................................................ 51
第 五 章 結論 (Conclusions) .................................................................................... 52
參考文獻 (References) ........................................................................................................ 53
論文著作表 (Publication List) .......................................................................................... 57
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[8] C. Delaveaud and C. Brocheton, “Compact combined antenna with dual dipolar-type radiation”, Microwave Opt. Technol. Lett., vol. 38, pp. 415418, 2003.
[9] S. Zhang, S. N. Khan, and S. He, “Reducing Mutual Coupling for an Extremely Closely-Packed Tunable Dual-Element PIFA Array Through a Resonant Slot Antenna Formed In-Between”, IEEE Trans. on Antenna and Propaga., vol. 58, pp. 2771 – 2776,2010.
[10] C. Y. Chiu, C. H. Cheng, R. D. Murch, and C. R. Rowell, “Reduction of Mutual Coupling Between Closely-Packed Antenna Elements”, IEEE Trans. on Antenna and Propaga., vol. 55, pp. 1732 – 1738, 2007.
[11] G. Chi, B. Li, and D. Qi, “Dual-band printed diversity antenna for 2.4/5.2-GHz WLAN application,” Microwave Opt. Technol. Lett., vol. 45, pp. 561–563, 2005.
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[15] Y. Kim, J. Itoh, and H. Morishita, “Decoupling method between two L-shaped folded monopole antennas for handsets using a bridge line”, IET Microwaves, Antennas and Propaga., vol. 4, pp. 863 – 870, 2010.
[16] K.-L. Wong, J.-H. Chou, C.-L. Tang, and S.-H. Yeh, “Integrated internal GSM/DCS and WLAN antennas with optimized isolation for a PDA phone,” Microwave Opt. Technol. Lett., vol. 46, pp. 323–326, 2005.
[17] S. Y. Lin and H. R. Huang, “Ultra-Wideband MIMO Antenna with Enhanced Isolation,” Microwave Opt. Technol. Lett., vol. 51, pp. 570-573, 2009.
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[19] 廖建興, “爆炸性之通訊資訊—MIMO多線技術之發展與運用,"IECQ報導, vol. 46, 2003.
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[21] P-S. Kildal and K. Rosengren, “Correlation and Capacity of MIMO Systems and Mutual Coupling, Radiation Efficiency, and Diversity Gain of their Antennas: Simulations and Measurements in a Reverberation Chamber”, IEEE Comm. Magazine, pp. 104-112, 2004.
[22] Kin-Lu Wong, Pei-Ji Ma, “Small-size Internal Antenna for LTE/WWAN Operation in the Laptop Computer,” IEEE Conference Publications, pp. 152-156, 20012.
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