臺灣博碩士論文加值系統

本論文主要的研究為雙極化介質共振器天線之設計。介質共振器擁有許多引人注目之特點，包含高介電常數、高品質因素及低溫度係數之特點，可縮短共振路徑之波長，以達到天線小型化之效果。雙極化天線之設計技術，將以兩正交極化之天線作為激發，其優勢相較於傳統單極天線不僅可減少無線通信中之多重路徑效應也可提高增益之值。
雙極化介質共振器天線，將利用兩正交極化之天線來作為設計，其槽孔將以T型之配置來作為設計，以使得兩激發模式之耦合減少以提高隔離度。而本論文所設計應用於雙頻雙極化介質共振器天線，其阻抗頻寬與操作頻段可符合WLAN-802.11b(2400~2484MHz)及WLAN-802.11a(5725~5825MHz)之相關規範，天線增益約為5~8.65dBi左右。

In this thesis, dual polarized dielectric resonator antennas have been studied. The dielectric resonator has many attractive features, such as high dielectric constant, high quality factor, and low frequency temperature coefficient. Dielectric resonator can reduce the wavelength of resonance mode to achieve antenna miniaturization. The dual-polarized design excites two orthogonal polarizations with the advantages of reducing the multi-path effects of the wireless communications and the antenna gain.
The design of dual polarized dielectric resonator antennas utilizes T-shape which to maintain high isolation of the two input ports enabling a reduced coupling effect between the excited modes. The Dual Polarized Dielectric Resonator Antenna exhibited the impedance bandwidth which met the specification of WLAN-802.11b (2400~2484MHz) and WLAN-802.11a(5725~5825MHz) and the measured peak gain of the antenna are 5~8.65dBi.

中文摘要................. i
英文摘要................ii
誌謝...................iii
目錄...................iv
圖目錄.................vii
表目錄.................xii
第一章 緒論 ........1
1.1 研究背景 ........1
1.2 研究動機與方向....2
1.3 研究方法 ........3
1.4 論文大綱 ........4
第二章 天線之基礎理論......6
2.1 概述............6
2.2 平面天線之種類....6
2.2.1偶極天線.....6
2.2.2單極天線.....8
2.2.3槽孔天線....11
2.3 平面天線之特性...12
2.3.1 天線阻抗與阻抗頻寬...12
2.3.2 天線之輻射場型......13
2.3.3 天線之指向性與增益...15
　2.4 平面天線之極化............15
　　　　2.4.1線性極化波............15
2.4.2圓形極化波........17
2.4.3橢圓極化波........18
2.5 雙極化天線...............19
第三章 微波介質共振器之理論分析......21
3.1 概述....................21
3.2 介質共振器...............21
3.2.1 介電常數............23
3.2.2 品質因素............25
3.2.3共振頻率溫度係數.......26
3.2.4介質共振器之特性量測....27
3.3 介質共振器之基本模態分析.....33
3.3.1 圓柱介質共振器........33
3.3.2 矩形介質共振器........40
3.3.3激發機制之探討.........45
第四章 應用於單頻2.45GHz之雙極化介質共振器天線 ..51
4.1 概述..............................51
4.2 矩形介質共振器之介電係數..............51
4.3 單頻2.45GHz之雙極化介質共振器天線.....55
第五章 應用於雙頻2.45/5.8GHz之雙極化介質共振器天線....67
5.1 概述....................................67
5.2雙頻雙極化介質共振器天線.....................67
第六章 結論與未來展望..............................80
參考文獻..........................................82

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