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研究生:陳文軒
研究生(外文):Chen,Wen-Xuan
論文名稱:平衡式分波器、具帶拒超寬頻與圓極化天線之設計
論文名稱(外文):Design of Balanced Power Divider, Band-Notched UWB Antenna, and Circularly Polarized Antenna
指導教授:李清和李清和引用關係許崇宜許崇宜引用關係
指導教授(外文):Lee, Ching-HerHsu, Chung-I G
口試委員:李清和許崇宜何明華湯敬文
口試委員(外文):Lee, Ching-HerHsu, Chung-I G.Ho, Min-HuaTang, Ching-Wen
口試日期:2017-7-28
學位類別:碩士
校院名稱:國立彰化師範大學
系所名稱:電信工程研究所
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2017
畢業學年度:105
語文別:英文
論文頁數:40
中文關鍵詞:平衡式功率分配器超寬頻天線圓極化天線
外文關鍵詞:BalancedPower dividerUWB antennaCircularly Polarized Antenna
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本論文完成一個平衡式功率分配器及兩支平衡式天線之研究及設計。首先為一三層平衡式功率分配器之設計,此部分本研究提出於接地面植入指叉式開路槽線及啞鈴式槽線陷波器結構來增強共模訊號之抑制。平衡式功率分配器於差模工作時,其對稱面等效為接地,故該些槽線結構將不影響差模響應;而操作於共模時,對稱面等效為開路,此時開路槽線部分將形成訊號電流之阻隔效應,使共模訊號之傳輸被抑制。
本論文於第二個電路提出一以共面波導饋入封閉式六角槽線之平衡式超寬頻天線設計,為能不與5-GHz之WLAN頻帶訊號互相干擾,此平衡式超寬頻天線在5‐6 GHz間設計有一截止頻帶。本電路之設計重點為將天線沿對稱面之垂直方向的尺寸儘量縮小,使共模工作時之槽線天線四分之一波長(λ/4)寄生共振器的共振頻率遠離差模通帶,以得到較佳之共模抑制。同理,產生截止頻帶用之槽線陷波器,其與槽線天線耦合之部分亦應儘量短,使其寄生之λ/4共振器不影響共模響應。
本論文之第三個電路為利用將兩L形單極天線垂直擺放成正交結構設計之平衡式圓極化濾波天線。由於圓極化天線之兩正交輻射場必須符合振福大小相同及相位差90°之特性,故本研究將兩L形天線互相垂直擺放,並植入一段90°之相位延遲線。此外,為了抑制差模通帶內之共模訊號,並於兩饋入線間,植入一段二分之一波長(λ/2)之共面波導線段。如此,在共模工作時,由於對稱面等效為開路,該λ/2共面波導線段分成兩並接於饋入線之λ/4開路殘段,可產生零點以抑制共模訊號;而差模工作時,該二λ/4殘段成為短路殘段,在與饋入線並接處呈開路,故不影響差模訊號之傳輸。
綜上所述,本論文主要致力於平衡式功率分配器與平衡式天線之設計,研究重點則在於共模訊號之抑制。結果顯示,本研究所提出之共模抑制架構具有很好之效果,所設計之平衡式功率分配器與平衡式天線亦有極佳之差模操作特性。
The study and design of a balanced power divider (PD) and two balanced antennas have been completed in this thesis. First, a three-layered balanced power divider consisting of two tightly stacked microstrip Wilkinson PDs was designed. With the partially interdigital open-ended slot and the dumbbell-shaped slot-line resonator embedded in the common ground (namely, the middle layer), the CM signal suppression was seen to be greatly enhanced. In essence, when the balanced power divider is in DM operation, the plan of symmetry is virtually grounded so that the slots on the middle layer would not be effective and have no influence on DM response. However, when in CM operation, the plane of symmetry is virtually open-circuited. The open-ended slot will block the signal current, rendering the CM signals suppressed.
In the second circuit of the thesis, we proposed a coplanar-waveguide-fed closed hexagonal-aperture slot for the balanced UWB antenna design. To avoid the interference with the 5-GHz WLAN systems, a 1-GHz-width notch band centered at 5 GHz is designed in the balanced UWB antenna. The main mechanism for enhancing CM suppression comes from the of vertical direction across the plane of symmetry. setting the dimension of the aperture along the longitudinal direction that is perpendicular to the plane of symmetry small enough so that the first resonant mode of the CM half-circuit of the aperture antenna can be pushed beyond the DM UWB passband. The similar strategy was also applied to the wave-trapping resonator by making the length of the CM parasitic λ/4 slot-line resonator short enough so that its resonant frequency will be located far away from the DM passband. Very good in-band CM suppression has been achieved.
In the third designed circuit, we proposed a balanced CP antenna that consists of two L-shaped monopole elements which are deployed perpendicular to each other. Since radiating a CP pattern needs the orthogonal fields to have a 90° phase difference, we embedded in one of the differential feedlines a 90° delay line. Also, a half-wavelength CPW line section is connected between the two feedlines, so that the λ/2 CPW line section can work as two shunt λ/4 open stubs when in CM operation to produce a transmission zero for suppressing in-band CM signals. However, when in DM operation, the two λ/4 line sections work as shorted stubs and exhibit an open-circuited condition at the joint points with the feedlines, allowing DM signals to transmit. Favorable CP performance and very good CM rejection were observed.
In summary, we have been devoted to the study and design of balanced power divider and balanced antennas in this thesis. The suppression of CM signals is of primary interest. Results show that the proposed strategies for CM suppression are very effective and the designed balanced power divider and balanced antennas have good DM performances.
中文摘要 i
Abstract ii
誌 謝 iv
TABLE OF CONTENTS v
LIST OF FIGURES vii
LIST OF TABLES ix

Chapter 1 Introduction 1
1-1 Research Motivation 1
1-2 Literature Survey 2
1-3 Chapter Outline 5
Chapter 2 Design of Balanced Power Divider with Wideband Common-Mode Suppression 6
2-1 Balanced Power Divider Design 6
2-1-1 Analysis of the Wilkinson Power Divider 6
2-1-2 Balanced Power Divider Design 11
2-2 Results and Discussions 17
Chapter 3 CM Suppression Enhancement for Balanced Band-Notched UWB Closed-Aperture Antenna 21
3-1 Balanced band-notched UWB aperture antenna design 21
3-2 Results and Discussions 23
Chapter 4 Design of Balanced CPW-Fed L-Shaped CP Antenna 29
4-1 Balanced CPW-Fed CP Antenna Design 29
4-2 Results and Discussions 31
Chapter 5 Conclusions 36
References 37
作者簡歷 40


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