請用此 Handle URI 來引用此文件:
http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/15481
標題: | 透明壓電超晶格小天線應用於FM頻段 Transparent piezoelectric superlattice small antenna for FM band application |
作者: | Bo-Zhi Zhang 張博智 |
指導教授: | 劉建豪(Chien-Hao Liu) |
關鍵字: | 壓電超晶格,透明化天線,微型化天線,金屬氧化物薄膜, Piezoelectric superlattice,transparent antenna,miniaturized antenna,ITO, |
出版年 : | 2020 |
學位: | 碩士 |
摘要: | 無線通訊爆炸的世代,無線傳輸裝置需求量越來越多,人類為了通訊之需,研發各種不同天線型態,隨著不同的需求轉變,天線設計型態也在改變中。有鑑於今後物聯網(IoT)與5G 的普及化,市場需要架設自由度較高的透明天線,能安裝至窗戶、玻璃、車窗等等上。除了透明化天線之外,微型化天線也是天線發展的重點,低頻傳輸天線常因為尺寸過大造成使用不便,對於小天線的需求也日益增加。基於透明以及微型兩發展重點,本研究利用壓電超晶格週期結構配合金屬氧化物薄膜,製作出應用於FM 頻段之透明壓電超晶格小天線。 本研究提出之透明壓電天線透明度約為80%,天線尺寸ka<0.07,其天線主體基材鐵電材料選用鈮酸鋰晶片,並將表面施加高電壓,製作週期極化壓電超晶格。配合金屬氧化物薄膜ITO 激發外加電場並利用電磁波與機械波耦合的極子特性在107~110 MHz 頻段激發與接收電磁波。 結果於本透明壓電超晶格天線之反射係數、遠場以及場型量測證明此利用金屬氧化物薄膜ITO 誘發之電磁波,並在操作頻率107.7~110 MHz 左右有電磁輻射產生,最後利用國家商業儀器之無線電介面卡USRP 再一次驗證了本研究提出之透明壓電超晶格小天線具有電磁波收發能力。本研究天線除了具備微型化更有透光率高之特性,其透明化與微型化的結合在未來值得深入探討。 With the rapid development of technology, there are more and more demands for wireless application. To communicate, people have studied types of antennas. The design of the antenna is also changing by time to cater to different demand. Given that the popularity of 5G and IoT in the next generation, transparent antenna which could be inserted into windows is the main issues nowadays. Except for the transparent antenna, antenna miniaturization is also the other important issue in this generation. The large size of low frequency antennas is always inconvenience which result in an increasing demand for small antennas. Based on this two developing issues, transparent piezoelectric superlattice small antenna has been proposed to apply in FM receiving. The proposed transparency of the antenna in this study is about 80%, and the size is designed as ka<0.07. Ferrolelectric Lithium Niobate(LN) is chosen for the substrate. By applying a high voltage electric field to LN, produce the Periodically Poled-Lithium Niobate (PPLN). With such that PPLN, the device could excite electric field with metal oxide thin film to couple the electromagnetic wave and the mechanical wave in the piezoelectric superlattice to excite or receive electromagnetic waves. According to the return loss, we demonstrated that the proposed antenna could induce the radiation of electromagnetic wave at 107.7~110 MHz. Verifying the effective of the function of receiving electromagnetic wave with USRP at the end. The proposed antenna has both small-size and see-through features which are worthy further discussion in the future. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/15481 |
DOI: | 10.6342/NTU202001606 |
全文授權: | 未授權 |
顯示於系所單位: | 機械工程學系 |
文件中的檔案:
檔案 | 大小 | 格式 | |
---|---|---|---|
U0001-1707202016460200.pdf 目前未授權公開取用 | 9.15 MB | Adobe PDF |
系統中的文件,除了特別指名其著作權條款之外,均受到著作權保護,並且保留所有的權利。