共平面波導饋入式圓極化環形單極天線之研製

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姓名

葉璟霈(Jing-pei Yeh) 查詢紙本館藏

畢業系所

電機工程學系

論文名稱

共平面波導饋入式圓極化環形單極天線之研製
(Coplanar Waveguide fed Circular Polarization Slotted Annular Ring Monopole Antenna)

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摘要(中)

本論文研製一共平面圓極化開槽環形單極天線(coplanar circular polarization slotted annular ring monopole antenna)，有別於常見的平面式圓極化天線，如微帶貼片天線(microstrip patch antenna)、槽孔天線(slot antenna)等，其阻抗頻寬(impedance bandwidth)受到天線結構上的限制而為單一頻段且窄頻特性，無法滿足於多頻段整合之無線通訊產品，有鑑於此，在設計上採用具有寬頻特性之單極天線作為首選。天線結構主要由共平面波導(coplanar waveguide，CPW)傳輸線與環狀開槽金屬環所組成，在圓極化頻段設計上利用環狀開槽金屬環上之環形電流路徑以及接地金屬面上非對稱電流產生之輻射，使原為線性極化(linear polarization)的單極天線具有圓極化特性。天線之10dB折返損耗(return loss)操作頻帶由1.5GHz至3GHz，阻抗頻寬約為66.7%，頻帶內涵蓋了GPS、DCS、PCS、PHS、WCDMA、Bluetooth等常用無線通訊頻段，此天線在GPS頻段下為圓極化、其餘操作頻段保有線性極化特性。此外，天線設計上可利用在接地金屬面延伸出長度約為四分之一導波波長(guide wavelength)的倒L形金屬片，藉由此金屬片增加一額外的電流路徑，改善輻射電場分量之振幅差距，設計出第二個圓極化頻段，使天線具有雙頻段圓極化特性。

摘要(英)

The design and analysis of a planar, circularly polarized, and slotted annular ring monopole antenna are presented. In contrast to traditional planar circularly polarized patch antenna and slot antennas poised for narrowband applications, the presented antenna is of relatively broad operating bandwidth by exploiting the broadband monopole antenna structure. Specifically, the proposed antenna consists of a coplanar-waveguide (CPW) fed annular ring monopole with a gap near the CPW feed. The circular polarization is essentially realized with the circular current flow on the slotted annular ring and the unsymmetrical surface current on the ground plane. Furthermore, additional circularly polarized operation bands can be realized with the incorporation of stretched-out quarter-wavelength inverted-L sleeves on the ground plane edges. In this thesis, a single-band and a dual-band CPW-fed slotted annular ring monopole antennas are demonstrated. The single-band antenna features circular polarization at the L1 band, while the dual-band antenna is of circular polarization at the L1 band, as well as at 1.96 GHz. In addition, both antennas is of operating frequencies ranging from 1.5 GHz to 3 GHz for the GPS, DCS, PHS, WCDMA, and Bluetooth applications.

關鍵字(中)

★ 圓極化
★ 單極天線
★ 軸比

關鍵字(英)

★ axial ratio
★ monopole antenna
★ circular polarization

論文目次

目錄
摘要................................................i
Abstract...........................................ii
致謝..............................................iii
目錄...............................................iv
圖目錄.............................................vi
表目錄...........................................xvii
第一章序論........................................1
1.1 研究動機與目的.................................1
1.2 文獻回顧.......................................2
第二章天線原理及應用..............................3
2.1 傳輸線與共平面波導結構.........................3
2.2 天線原理與設計.................................4
2.3 電磁波極化.....................................9
2.4 天線設計流程..................................12
第三章共平面單頻段圓極化環形單極天線設計與分析...14
3.1 單頻段圓極化環形單極天線結構與參數分析........15
3.1.1 環狀開槽金屬環間隙之分析....................16
3.1.2 接地金屬面之分析............................25
3.1.3 環狀開槽金屬環與接地金屬面間距之分析........33
3.1.4 環狀開槽金屬環半徑之分析....................36
3.1.5 環狀開槽金屬環線寬之分析....................38
3.2 模擬及量測結果比較............................44
第四章共平面雙頻段圓極化環形單極天線設計與分析...54
4.1 雙頻段圓極化環形單極天線結構與參數分析........54
4.2 模擬及量測結果比較............................79
第五章結論.......................................89
參考文獻...........................................90
附錄...............................................92

參考文獻

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指導教授

丘增杰、陳念偉
(Tsen-chieh Chiu、Nan-wei Chen)

審核日期

2010-7-19

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