臺灣博碩士論文加值系統

隨著時代之進步，無線通訊應用也隨之普遍，人們由書寫信紙傳遞訊息，演變至透過通訊軟體拉近彼此距離，因此無線通訊設備的訊息傳輸就更加受到重視，而使訊息相互傳輸之關鍵角色，非天線莫屬。現今生活中，大眾較常使用之頻率為WLAN頻段，而為使無線通訊設備有更良好的通訊品質，本論文將提出一種，具有圓極化之雙頻高增益天線陣列，利用圓極化之特性避免接收端之天線極化問題，再透過陣列天線提升輻射之增益，接著利用金屬反射板，使天線獲得更佳之增益效果，其中陣列天線所使用之陣列結構為－單殘段相移器陣列結構，利用該陣列結構產出不同頻率之相位延遲，再將四組雙頻單極天線結合至陣列結構上，有效產生出WLAN之2.4 GHz頻段、高頻5.2 GHz以及5.8 GHz頻段，且皆具有圓極化之效果。

As time progresses, the application of wireless communication has become commonplace. People have evolved from writing letters to using communication software. Therefore, the transmission of information between wireless communication devices is more valued. The key role of information transmission is the antenna. Nowadays, WLAN bands are widely used in people’s daily lives. To enhance signal quality of wireless communication equipment, a dual-band high-gain circularly polarized (CP) antenna array is proposed. By designing CP radiation and array structure, related polarization mismatch problems and antenna gain can obtain improvement. In addition, a metallic plane (reflector) located the bottom of the antenna is used to enhance the antenna gain. The array antenna has a single stub phase shifter array structure, which is used to generate phase delays for different frequencies. The combination of the four dual-band monopole antennas and single stub phase shifter array structure forms the dual-band CP array antenna for operation in 2.4 GHz and 5.2/5.8 GHz WLAN bands.

目錄

摘　要..............................................i
ABSTRACT...........................................ii
致 謝...............................................iii
目錄................................................iv
圖目錄..............................................v
表目錄..............................................ix
第一章 序論........................................1
1.1 概述............................................1
1.2 研究目的........................................4
1.3 文獻導覽........................................5
1.4 內容摘要........................................7
第二章 單頻WLAN之高增益圓極化單極天線陣列.............9
2.1 概述............................................9
2.1.1 單極天線......................................10
2.1.2 陣列結構......................................11
2.1.3 天線反射器....................................15
2.1.4 天線極化......................................16
2.2 具有相移器之單頻圓極化單極天線陣列.................18
2.2.1 天線原理與結構拆解.............................21
2.2.2 實驗結果與分析.................................26
第三章 寬頻WLAN之高增益圓極化槽孔天線陣列.............48
3.1 概述............................................48
3.1.1 槽孔天線......................................49
3.2具有雙頻圓極化之寬頻槽孔WLAN高增益天線陣列..........51
3.2.1 天線原理與結構拆解.............................54
3.2.2 實驗結果與分析.................................60
第四章 雙頻WLAN之高增益圓極化單極天線陣列.............91
4.1 概述............................................91
4.1.1 單殘段匹配.....................................92
4.2雙頻雙極化之WLAN高增益單極天線陣列..................94
4.2.1 天線原理與結構拆解..............................97
4.2.2 實驗結果與分析.................................108
第五章 結論.........................................138
參考文獻.............................................144

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