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研究生:蔣菡澤
研究生(外文):Jiang, Han-Ze
論文名稱:以T型狹縫結構提升微帶饋入式雙倒F天線之隔離度設計
論文名稱(外文):Design of a T-shaped Slot Structure for Increasing Isolation Between Two Nearby Microstrip-fed PIFAs
指導教授:吳霖堃
指導教授(外文):Wu, Lin-Kun
學位類別:碩士
校院名稱:國立交通大學
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:2010
畢業學年度:98
語文別:英文
論文頁數:54
中文關鍵詞:多輸入多輸出系統分集技術隔離度T型狹縫微帶線-狹縫轉接
外文關鍵詞:MIMO systemDiversity technologyIsolationT-shaped slotlineMicrostrip-to-slotline Transition
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本論文提出一個可應用於具diversity功能的無線通訊系統的T型狹縫隔離結構設計。完整的電路由兩個微帶線饋入的PIFA天線、T型狹縫和微帶線-狹縫轉接結構所組成。為了減少PIFA天線的空間尺寸,因此將PIFA天線開路端的傳輸線繞成螺旋形,而且能使得天線更加緊密可實際應用在無線手持裝置上。因為兩相鄰PIFA天線間強烈的互耦合效應造成互相干擾,因此需要設計T型狹縫的隔離結構去降低互耦合效應,而且微帶線-狹縫轉接結構在PIFA天線和T型狹縫之間提供能量的耦合。最後電磁模擬與量測結果證明T型狹縫結構提昇隔離度的同時,亦不影響原本PIFA天線的阻抗匹配。再者如原先預期的,因為在接地面上的T型狹縫結構改變了電流分佈的情況,輻射場形和峰值增益也稍有變動。理論與實驗量測的一致性對此論文的設計方法提出最佳的佐證。
A novel isolation structure based on a T-shaped slotline junction for use with diversity-capable wireless communication systems is presented. The entire circuit consists of two microstrip-fed PIFAs, a T-shaped slotline junction, and two microstrip-to-slotline transitions. For reducing the dimensions of PIFA, the typically straight open-ended transmission line is turned into a spiral such that it is more compact and practical for the wireless mobile devices. Because the intense correlation due to mutual coupling between two nearby PIFAs, we design a T-shaped slotline junction-based isolation enhancement structure to suppress the coupling effect. Moreover, the microstrip-to-slotline transitions provide the coupling of energy between PIFAs and T-shaped slotline structure. Finally, the simulated and measured results prove that T-shaped slotline structure increases the isolation without affecting the impedance matching of PIFAs. Furthermore, as expected, the radiation patterns and peak gain vary slightly as the current distribution is changed by the T-shaped slotline structure on the ground plane. Good agreements observed between theoretical and measured results confirm the validity of the proposed design in this thesis.
CHAPTER 1 Introduction 1
1.1 Background and Problems 1
1.2 Multi-input Multi-output (MIMO) Technology 3
1.3 Thesis Organization 5

CHAPTER 2 Diversity Technology 6
2.1 Introduction 6
2.2 Diversity Techniques 7
2.2.1 Spatial Diversity 8
2.2.2 Angle Diversity 9
2.2.3 Frequency Diversity 1

CHAPTER 3 The Proposed Microstrip-fed PIFA and T-shaped
Slot Isolation Structure 12
3.1 Introduction 12
3.2 Design and Configuration of PIFA 14
3.2.1 Development of PIFA 14
3.2.2 Design of The Proposed Microstrip-fed PIFA 16
3.3 Design of The T-shaped Slot Isolation Structure 18
3.4 Microstrip-to-slotline Transition 21
3.5 Discussion of The Two-Port Network Model 25

CHAPTER 4 The Simulated and Measured Results 34
4.1 The Fabricated Test Structures 34
4.2 Two-Port Scattering Parameters 37
4.3 Far Fields Radiation Patterns 43
4.4 Surface Current Distribution 48

CHAPTER 5 Conclusion 51
REFERENCES 52
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[2] J. W.Wallace, M. A. Jensen, A. L. Swindlehurst, and B. D. Jeffs, “Experimental character- ization of the MIMO wireless channel: Data acquisition and analysis,” IEEE Trans. Wireless Commun., vol. 2, pp.335–343, Mar. 2003.
[3] D. Sievenpiper, L. Zhang, R. F. J. Broas, N. G. Alexopolous, and E. Yablonovitch, “High-impedance electromagnetic surfaces with a forbidden frequency band,” IEEE Microw. Theory Tech., vol. 47, no. 11, pp. 2059–2074, Nov. 1999.
[4] F. Yang and Y. Rahmat-Samii, “Microstrip antennas integrated with electromagnetic band-gap (EBG) structures: A low mutual coupling design for array applications,” IEEE Trans. Antennas Propag., vol. 51, no. 10, pp. 2936–2946, Oct. 2003.
[5] L. Li, B. Li, H. X. Liu, and C. H. Liang, “Locally resonant cavity cell model for electromagnetic band gap structures,” IEEE Trans. Antennas Propag., vol. 54, no. 1, pp. 90–100, Jan. 2006.
[6] Choi, V. Govind, and M. Swaminathan, “A novel electromagnetic bandgap (EBG) structure for mixed-signal system applications,” in Proc. IEEE Radio and Wireless Conf., Sep. 19–22, 2004, pp. 243–246.
[7] C.-Y. Chiu, C.-H. Cheng, R. D. Murch, and C. R. Rowell, “Reduction of mutual coupling between closely-packed antenna elements,” IEEE Trans. Antennas Propag., vol. 55, no. 6, pp. 1732–1738, Jun. 2007.
[8] D. Guha, M. Biswas, and Y. M. M. Antar, “Microstrip patch antenna with defected ground structure for cross polarization suppression,” in IEEE Antennas Wireless Propag. Lett., 2005, vol. 4, pp. 455–458.
[9] G. J. Foschini and M. J. Gans, “On limits of wireless communications in a fading environment when using multiple antennas,” Wireless Personal Communications, vol. 6, pp. 311–335, March 1998.
[10] Young P.H., Electronic Communication Techniques, 4th edition, Prentice Hall, 1999.
[11] D. Shiu, G. J. Foschini, M. J. Gans, and J. M. Kahn, “Fading correlation and its effect on the capacity of multi-element antenna systems,” IEEE Trans. Comm., vol. 48, pp. 502–513, March 2000.
[12] D. Gesbert, H. B¨olcskei, D. Gore, and A. Paulraj, “Outdoor MIMO wireless channels: Models and performance prediction,” IEEE Trans. Communications, vol. 50, pp. 1926–1934, Dec. 2002.
[13] Y.-S. Wang, M.-C. Lee, and S.-J. Chung, “Two PIFA-Related Miniaturized Dual-Band Antennas,” IEEE Trans. Antennas Propag., vol. 55, no. 3, pp. 805–811, March 2007.
[14] D. Ahn, J. S. Park, C. S. Kim, J. Kim, Y. Qian, and T. Itoh, “A design of the low-pass filter using the novel microstrip defected ground structure,” IEEE Microw. Theory Tech., vol. 49, no. 1, pp. 86–93, Jan. 2001.
[15] C. Caloz, H. Okabe, T. Iwai, and T. Itoh, “A simple and accurate model for microstrip structures with slotted ground plane,” IEEE Microwave Wireless Comp. Lett., vol. 14, no. 4, pp. 133–135, Apr. 2004.
[16] Chamber, D., et al., “Microwave Active Network Synthesis,” Semiannual Report, Stanford Resr. Inst., June 1970.
[17] Knorr, J. B., “Slotline Transitions,” IEEE Trans., Vol. MTT-22, 1974, pp. 548-554.
[18] Janaswamy, R., and D. H. Schaubert, “Characteristic Impedance of a Wide Slotline on Low Permittivity Substrates,” IEEE Trans., Vol. MTT-34, 1986, pp. 9

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