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http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/67138
Title: | 基於複合式左右手傳輸線之雙頻開槽天線陣列 Dual-Band Slot Antenna Arrays Based on Composite Right-/Left-Handed Transmission Lines |
Authors: | Jen-Kuei Tsai 蔡仁貴 |
Advisor: | 陳士元 |
Keyword: | 複合式左右手傳輸線,雙頻陣列天線,雙頻圓極化陣列天線, Composite right-/left-handed (CRLH) transmission lines,dual-band antenna array,dual-band circular polarization antenna array, |
Publication Year : | 2017 |
Degree: | 碩士 |
Abstract: | 本論文提出了四款結合複合式左右手傳輸線的雙頻寬邊天線陣列,其中兩款為線性極化陣列天線而另外兩款則是圓極化陣列天線,本論文中的陣列天線都是根據槽孔天線進行設計並且有著相當的增益值。
首先是線性極化,吾人設計了兩款分別沿著E平面及沿著H平面擺設的陣列天線,這兩款陣列天線均由四個天線單元所組成。為了達成寬邊輻射的目的,天線單元應使用同相饋入而這樣的條件在雙頻都應被滿足。藉由搭配使用複合式左右手傳輸線與一般傳輸線作為饋入網路便可符合雙頻同相饋入的條件。除了單元間的饋入結構外,複合式左右手傳輸線結合一般傳輸線還可用於設計具有180度相位差的等功率分配器,而這樣的功率分配器亦被用於論文所提出的E平面陣列天線。 此外,關於圓極化的部分,吾人設計了兩款雙頻陣列天線分別在兩個頻帶有著相同及相反的圓極化。複合式左右手傳輸線作為饋入網路提供了90度或270度相位差來滿足各頻帶下右圓極化或左圓極化的要求。所有的模擬及量測結果皆顯示了良好的一致性。 In this thesis, four dual-band broadside antenna arrays incorporated with composite right-/left-handed (CRL H) microstrip lines are proposed. Two of them are designed for linear polarization, while the others are for circular polarization. All of the antenna arrays are based on slot antenna and with adequate gain. First, for linear polarization, linear arrays arranged along H-plane and E-plane directions are designed, respectively. Both arrays are composed of four slot antenna elements. In order to achieve broadside radiation, elements should be fed with in-phase excitation. This in-phase requirement should be satisfied at both operating bands. By combining CRLH transmission lines (TLs) with ordinary TLs to realize the array feeding network, the in-phase requirement can be achieved simultaneously at both desired bands. Besides, the CRLH TL can also be used to realize an equal power divider with 180 phase difference at both bands. This power divider is later on applied in the E-plane array. Second, for circular polarization (CP), two array designs are proposed with respectively the same and opposite handedness of CP at the two desired bands. The CRLH TLs are used to design the feeding network that provides 90 or 270 phase difference between adjacent perpendicular elements according to the handedness of CP. All the simulated and measured results are in good agreement. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/67138 |
DOI: | 10.6342/NTU201702947 |
Fulltext Rights: | 有償授權 |
Appears in Collections: | 電信工程學研究所 |
Files in This Item:
File | Size | Format | |
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ntu-106-1.pdf Restricted Access | 4.73 MB | Adobe PDF |
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