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論文名稱 Title |
應用於LTE MIMO行動裝置天線之實現 Mobile Devices Antenna for LTE MIMO Operations |
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系所名稱 Department |
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畢業學年期 Year, semester |
語文別 Language |
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學位類別 Degree |
頁數 Number of pages |
41 |
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研究生 Author |
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指導教授 Advisor |
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召集委員 Convenor |
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口試委員 Advisory Committee |
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口試日期 Date of Exam |
2014-07-09 |
繳交日期 Date of Submission |
2014-07-26 |
關鍵字 Keywords |
多頻段天線、隔離度提升、MIMO、LTE、天線 multiband antenna, LTE, MIMO, isolation enhancement, Antenna |
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統計 Statistics |
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中文摘要 |
本論文主要探討可適用於LTE/WWAN多頻段天線設計能操作於LTE/WWAN通訊系統,且適合內置於智慧型手機。本文以單極天線為參考天線,產生1.8 GHz共振頻率點。然後,在單極天線路徑增加接地耦合殘段的調整機制,產生700與900 MHz共振頻率點;最後,調整線寬線距使它有良好的阻抗匹配。滿足反射係數以可接受-6 dB來定義,此多頻段單極天線足以涵蓋LTE 700、LTE/GSM 900、LTE/DCS 1800、PCS 1900及UMTS等五個操作頻段。接著將此天線應用於多重輸入輸出(MIMO)架構上,藉由簡單架構之隔離器之設計,使S21可以達到接近-15 dB,而LTE頻段可接受標準為S21 < -10 dB。最後,所提出的天線面積大小為50 × 20 × 0.8 mm3容易實現於LTE/WWAN的MIMO印刷電路板天線。實際測量天線之反射係數來證實所模擬設計的平面天線確實可以適用,詳細的天線參數設計方式及實驗數據將在本論文中說明。 |
Abstract |
This thesis mainly discusses the design of LTE multi-band antennas for the applications of the LTE communication systems. The proposed antenna is also suitable for being embedded in smart mobile devices. A monopole antenna resonates at a frequency of 1.8 GHz was designed as the reference antenna. Then, two resonant frequencice of 700 and 900 MHz were obtained by coupling two shorting strips to the reference antenna. Finally, good impedance matching can be obtained by adjusting the strip width. The proposed multi-band antenna achieved good impedance matching over operating bands of the LTE 700, LTE/GSM 900, LTE/DCS 1800, PCS 1900 and UMTS under S11 ≤ -6 dB criterion. In addition, this antenna element was further applied to multiple-input multiple-output (MIMO) antenna communication system. A simple isolator was designed and placed it between two antenna elements. In this case, the S21 achieves near -15 dB near 1.8 GHz and the generally acceptable standard S21 < -10dB for the LTE applications. The overall antenna size is of only 50 × 20 × 0.8 mm3 that can be easily realized on the printed circuit board. Antenna parameters such as reflection coefficient was measured to validate the proposed antennas. Detail parameters studies and measurement data were performed in the thesis. |
目次 Table of Contents |
摘要 ii Abstract iii 1. 序論 1 1.1研究背景與動機 1 1.2研究方法 2 1.3論文大綱 2 2. 基本天線理論和簡介 3 2.1天線簡介 3 2.2天線特性參數 3 2.3單極天線 (Monopole) 7 2.4倒L型天線 (inverted-L antenna) 8 2.5倒F型天線 (inverted-F antenna) 9 3. 設計LTE天線在行動端 10 3.1 LTE天線設計目標 10 3.2天線結構與設計流程 10 3.3天線參數調整與討論 16 3.4模擬與量測結果 22 3.5結論 23 4. MIMO天線與隔離度探討 24 4.1 MIMO天線隔離方法概述 24 4.2 MIMO對天線影響 25 4.3 隔離器設計 26 4.4 實作與量測探討 28 5. 結論 30 參考文獻 31 |
參考文獻 References |
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