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http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/7140
標題: | 壓電微型化天線陣列應用於VHF波源判定 Piezoelectric Miniaturized Antenna Array for Source Direction Finding |
作者: | Zhe-Yuan Zhang 張哲源 |
指導教授: | 劉建豪 |
關鍵字: | 波源方向測位,壓電超晶格,微型化天線,天線陣列,MUSIC演算法, direction finding,piezoelectric superlattice,antenna miniaturization,antenna array,MUISC (Multiple Signal Classification), |
出版年 : | 2020 |
學位: | 碩士 |
摘要: | 隨著對通訊品質與傳輸效率需求的增加,MIMO多輸入多輸出天線傳輸陣列藉由判定波源方向以波束成形(Beamforming)的方式增加整體陣列增益的使用日益增加,然而在低頻天線陣列的應用上,過大的天線尺寸與天線間距往往造成攜帶性與隱匿性的不便。
有鑑於此,本研究提出一微型化壓電超晶格極子天線,ka約為0.05,利用壓電材料能使機械波與電磁波耦合的特性,以微機電製程與高壓直流電極化的方式在鈮酸鈮壓電晶片上進行週期性的極化,極化後的週期結構能加強耦合現象的產生,並設計在特定頻段接收與輻射電磁波,藉由高介電係數的壓電材料達到微型化天線目的。 接著,將所提出的壓電超晶格極子化天線以遠小於一般天線陣列間距的1/20波長排列,並在陣列天線後接上以BMMA電路為概念所設計的匹配電路,藉由此電路減少縮短天線間距所產生訊號耦合的影響,並增加輸出端相位差,再利用ADS電路模擬軟體進行二維與三維最佳化模擬驗證後進行實驗。放大後的相位差經由MUSIC演算法驗證後能在頻譜上有更顯著的波峰值,使判定波源角度上有更高的準確度與抗雜訊能力。 經本實驗研究後,能利用壓電微型化天線與額外匹配電路減少整體裝置尺寸,使波源判定技術應用在低頻時能更加具有機動性與隱蔽性而不影響效能。 With the increasing demand for communication and transmission efficiency, the use of MIMO(Multiple Input Multiple Output)antenna arrays to increase the overall gain by beamforming is increasing. However, for military、nautical、and rescue applications that use low-frequency to reduce the loss caused by the transmission distance, excessive antenna size and antenna spacing cause inconvenience of portability and concealment. In this study, a miniaturized piezoelectric superlattice polar antenna is proposed, which uses piezoelectric materials to make mechanical wave and electromagnetic waves and electromagnetic wave couple and resonate. And use the periodic structure design to increase the piezoelectric coupling phenomenon in a specific frequency to achieve the purpose of miniaturized antenna. Next, we arranged the piezoelectric superlattice polarized antenna array at a 1/20 less than the spacing of the general antenna array, and connect external coupling networks(ECNs). The amplified phase difference can have a more significant peak on the MUSIC spectrum, and it has higher accuracy and anti-noise ability in resolving the wave source angle. After this research, this method can effectively reduce the size of the low-frequency antenna and the use external coupling networks to reduce the antenna spacing without affecting performance. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/7140 |
DOI: | 10.6342/NTU202000983 |
全文授權: | 同意授權(全球公開) |
電子全文公開日期: | 2023-07-15 |
顯示於系所單位: | 機械工程學系 |
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檔案 | 大小 | 格式 | |
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ntu-109-1.pdf | 6.92 MB | Adobe PDF | 檢視/開啟 |
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