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Theoretical analysis and application of antenna with band notched characteristic 朱?誼、吳俊德

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Theoretical analysis and application of antenna with band notched characteristic 朱?誼、吳俊德

E-mail: 343636@mail.dyu.edu.tw

ABSTRACT

This thesis is focused on suppressing the unwanted band for ultra wideband antenna. The unused band in ultra wideband antenna always caused too much power consumption, and radiated noise to interfere other wireless system. Therefore, it is very important to study the mechanism of suppressing unwanted signal on antenna instead of using filters before/after transmitting/receiving antenna.

The main mechanism of this thesis is to put resonators nearby the main current distribution of the antenna. First, we use simulated software to predict the main current distribution in the band that we want to suppress. Then we put the resonator nearby the main current of the antenna. The radiated electromagnetic wave will couple to the resonator and induce opposite current to cancel the radiated field. The final goal of this project is to devise a general mechanism to be fit for any antenna structure rather than do it case by case.

Keywords : Ultra Wide-Band Antenna、resonator

Table of Contents

封面內頁 簽名頁 中文摘要........................iii 英文摘要............

............ iv 誌謝..........................v 目錄.........

.................vi 圖目錄......................... viii 表目錄..

.......................xi 第一章 緒論 1.1 前言...................

.1 1.2 研究動機與目的...............3 1.3 論文架構..................4 第二章  小型單極超寬頻天線且具有帶斥特性的應用探討 2.1天線設計...................5 2.2模擬與量 測反射損耗結果討論..........7 2.3分析與探討.................8 2.3.1由電流圖來分析 帶斥的機制........8 2.3.2探討耦合線?數對帶斥效果的變化.....9 2.4模擬與測量場型結果與討論....

......14 第三章 利用雙L型的挖槽產生雙帶斥超寬頻天線的探討 3.1天線設計...............

...18 3.2模擬與量測反射損耗結果討論.........20 3.3分析與探討.................21 3.3.1由電流圖來分析帶斥的機制........21 3.3.2探討耦合線?數對帶斥效果的變化.....25 3.4模擬與測量場 型結果與討論..........33 第四章 利用耦合線在超寬頻天線產生帶斥特性 4.1 模擬方式.........

.........38 4.2帶斥的設計.................40 4.3探討a、b?數對帶斥效果的變化...

.....44 4.4模擬與測量場型結果與討論..........48 第五章 總結................

......52 參考文獻........................53 圖目錄 圖2.1小型單極超寬頻天線且具 有帶斥特性的結構圖.......6 圖2.2小型單極超寬頻天線且具有帶斥特性的模擬與量測反射損耗 圖(G1 = 0.4 mm)

......................7 圖2.3模擬5.9GHz的電流分佈圖................

.9 圖2.4天線結構圖-探討G1?數................. 10 圖2.5 模擬G1?數反射損耗圖........

......... 11 圖2.6 天線結構圖-探討W4?數................ 12 圖2.7模擬W4?數反射損耗圖

................. 13 圖2.8天線擺放位置....................... 14 圖2.9模擬與測量場型圖(a)3.6 GHz x-z plane(b)3.6 GHz y-z plane ..........................

.... 15 圖2.10模擬與測量場型圖(a)7.1 GHz x-z plane (b)7.1 GHz y-z plane ...................

.......... 16 圖2.11天線實作圖........................ 17 圖3.1利用雙L型的 挖槽產生雙帶斥超寬頻天線的結構圖.... 19 圖3.2 利用雙L型的挖槽產生雙帶斥超寬頻天線的模擬與量測反 射損耗圖

.......................... 20 圖3.3模擬無帶斥效果中心頻率3.6 GHz的電流分佈圖...

.. 22 圖3.4模擬有帶斥效果中心頻率3.6 GHz的電流分佈圖..... 22 圖3.5模擬無帶斥效果中心頻率5.5 GHz的電流 分佈圖..... 23 圖3.6模擬有帶斥效果中心頻率5.5 GHz的電流分佈圖..... 23 圖3.7驗證帶斥中心頻率3.6 GHz 實際長度與計算長度..... 24 圖3.8驗證帶斥中心頻率5.5 GHz實際長度與計算長度..... 24 圖3.9天線結構圖- 探討a1?數.................. 25 圖3.10模擬a1?數反射損耗圖 .................

26 圖3.11天線結構圖-探討a2?數................. 27 圖3.12模擬a2?數反射損耗圖........

......... 28 圖3.13天線結構圖-探討b1?數................. 29 圖3.14模擬b1?數反射損耗 圖................. 30 圖3.15天線結構圖-探討b2?數................. 31 圖3.16

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模擬b2?數反射損耗圖................. 32 圖3.17天線擺放位置................

...... 33 圖3.18模擬與測量場型圖(a)2.8 GHz x-z plane (b)2.8 GHz y-z plane .................

............ 34 圖3.19模擬與測量場型圖(a)4.1 GHz x-z plane (b)4.1 GHz y-z plane ...........

.................. 35 圖3.20模擬與測量場型圖(a)8 GHz x-z plane (b)8 GHz y-z plane.. .....

........................ 36 圖3.21天線實作圖....................

.... 37 圖4.1利用耦合線在超寬頻天線產生帶斥特性的結構圖 .... 39 圖4.2超寬頻天線5.5 GHz的電流分佈圖..

.......... 40 圖4.3天線結構圖........................ 41 圖4.4反射損耗圖.

....................... 41 圖4.5帶斥中心頻率6.6 GHz.................

. 43 圖4.6利用耦合線在超寬頻天線產生帶斥特性模擬與量測反射損耗 圖.....................

........ 43 圖4.7天線結構圖-探討a?數.................. 44 圖4.8模擬a?數反射損耗圖.

................. 45 圖4.9天線結構圖-探討b?數.................. 46 圖4.10模 擬b?數反射損耗圖.................. 47 圖4.11天線擺放位置.................

..... 48 圖4.12模擬與測量場型圖(a)3.6 GHz x-z plane (b)3.6 GHz y-z plane ..................

.............. 49 圖4.13模擬與測量場型圖(a)8 GHz x-z plane (b)8 GHz y-z plane.. .........

.................... 50 圖4.14天線實作圖................... 51 表目錄 表1.現今運用的通訊協定..................... 2 表2.G1?數變化與帶斥中心頻率與頻寬對照表.

........ 11 表3.W4?數變化與帶斥中心頻率與頻寬對照表......... 13 表4.a1?數變化與帶斥中心頻率 和頻寬對照表.......... 26 表5.a2?數變化與帶斥中心頻率和頻寬對照表......... 28 表6.b1?數變化 與帶斥中心頻率和頻寬對照表......... 30 表7 .b2?數變化與帶斥中心頻率和頻寬對照表......... 32 表8. a?數變化與帶斥中心頻率和頻寬對照表 ......... 45 表9. b?數變化與帶斥中心頻率和頻寬對照表 ....

..... 47 REFERENCES

[1] G.Yang, T.Zhang, W. Li, and Q.Wu,“A Novel Stable Miniaturized Frequency Selective Surface,” IEEE Antennas Wireless Propagat. Lett., Vol. 9, no. 4, pp. 1018-1021, 2010.

[2] S.H.Jia, and M.J.Lancaster,“Design of highly selective microstrip bandpass filters with a single pair of attenuation poles at finite frequencies”

Microwave Theoty and Techniques, IEEE Transactions on, Vol. 48, no. 10, pp. 1098-1107 [3] H.W.Liu, C.H.Ku, and C.F.Yang, “Compact Monopole Antenna With Band-Notched Characteristic for UWB Applications,” IEEE Antennas Wireless Propagat. Lett., Vol. 9, no. 4, pp.

397-400, 2010.

[4] W.Qin, and J.Li, “A Novel Daul Frequency Notched UWB Antenna with Daul L-shape Slots,”Signala Systems and Electronics, Vol. 2, no.

3, pp. 1-3, 2010 [5] K.G.Thomas, and M.Sreenivasan, “A Simple Ultrawideband Planar Rectangular Printed Antenna With Band Dispensation,

” IEEE Trans Antennas Propag., Vol. 58, no. 8, pp. 27-34, 2010.

[6] H.W.Liu, C.H.Ku, and C.F.Yang,“Novel CPW-Fed Planar Monopole Antenna for WiMAX/WLAN Applications,” IEEE Antennas Wireless Propagat. Lett., Vol. 9, no. 4, pp. 240-243, 2010.

[7] D.O.Kim, and C.Y.Kim,“CPW-fed ultra-wideband antenna with triple-band notch function”Electronics Letters, Vol. 46, no. 2, pp.

1246-1248, 2010

參考文獻

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