臺灣大學: 電信工程學研究所李學智廖祿鴻Liao, Lu-HongLu-HongLiao2013-03-272018-07-052013-03-272018-07-052012http://ntur.lib.ntu.edu.tw//handle/246246/252561藉由多輸入多輸出(Multiple-Input Multiple-Output, MIMO)系統，也就是在傳送端與接收端加入多根天線來增加資料傳輸的速度已經被證實。另一方面，長期演進技術(Long Term Evolution, LTE)是一種支援多輸入多輸出技術的行動通訊標準，也就是所謂的第四代行動通訊標準。本論文提出一種適用於LTE 700MHz的多輸入多輸出天線單元。 在多天線設計中，匹配條件不同於單天線設計。多天線設計的匹配條件會在本論文中被討論。另外，通道容量是一個衡量多輸入多輸出系統的重要指標。本論文也會從通道容量的角度討論一些多輸入多輸出天線單元設計的標準。 隔離對於多輸入多輸出天線單元設計是一個重大的挑戰。本論文使用懸掛線做為去耦合結構來達成隔離增強。在之前的探討中，懸掛線的形狀及位置只能藉由大量的模擬來得到。為了增加效率，本論文使用了因子實驗(Factorial Experiment)和效應圖(Effect Plot)來有效低找到懸掛線的最佳形狀及位置。最後，本論文提出一個工作在所謂八分之波長模態的小型化平面倒F天線。這個天線的性能在本文最後會被仔細低討論。It has been shown that data rate can be enhanced through Multiple-Input Multiple-Output (MIMO) systems, which add multiple antenna elements at both transmitter and receiver. On the other hand, Long Term Evolution (LTE), which supports MIMO technique, is a wireless communication standard for 4thgeneration mobile communication. Therefore, this thesis proposes a compact MIMO antenna element for LTE-700MHz applications. Matching conditions for multiple-element antenna design are different to single element design. The issue is investigated in this thesis. In addition, channel capacity is a major index for MIMO system performance. This thesis also discusses some criterions for MIMO antenna element design based on channel capacity. Isolation is the challenge in design of MIMO antenna element. This thesis uses a suspended line as the decoupling structure to achieve isolation enhancement. In the literatures, the shape and position of the suspended line are obtained by a number of independent simulations. To improve the efficiency, this thesis uses fractional factorial experiment together with effect plot to find the best shape and position of the suspended line. Finally, a planar PIFA which operates at the so called “ mode” is proposed. The performance of the proposed PIFA is carefully discussed at the last part of this thesis.1109253 bytesapplication/pdfen-US多輸入多輸出(MIMO)長期演進技術(LTE)匹配條件隔離增強懸掛線部分因子實驗平面倒F天線Multiple-Input Multiple-Output(MIMO)Long Term Evolution(LTE)matching conditionsuspended linefactorial experimentplanar PIFAthesishttp://ntur.lib.ntu.edu.tw/bitstream/246246/252561/1/ntu-101-R99942083-1.pdf