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研究生:邱文斗
研究生(外文):Chiu, Wen-Tou
論文名稱:低旁波瓣之洩漏波天線陣列設計
論文名稱(外文):Design of Low Side Lobe Level Leaky Wave Antenna Array
指導教授:周復芳
指導教授(外文):Jou, Christina F.
學位類別:碩士
校院名稱:國立交通大學
系所名稱:電機學院碩士在職專班電信組
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:37
中文關鍵詞:微帶線洩漏波天線旁波瓣陣列
外文關鍵詞:microstripleaky-wave antennasidelobelinear array
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本篇論文提出一種降低旁波瓣的微帶線洩漏波天線之設計,由於傳統微帶線洩漏波天線末端開路的架構,使得行進波在微帶線末端,因不連續而造成反射,此反射能量將沿著相反方向傳遞能量,同時也將此反射能量向外輻射,形成了不想要的旁波瓣。
此架構主要包含三個短洩漏波天線所組成的陣列天線,將反射波能量以再利用的方式,將輻射後剩餘的能量導引,並分別饋入其餘的兩個陣列天線中,將反射波功率再輻射利用,本天線是製作在FR-4板材上,操作頻率為4.4GHz,在場型的量測中,波束方向為~30?a,3dB波束寬度為~40?a,天線增益為+8.5dBi,旁波瓣位準為 -13dB。
利用此設計有效降低旁波瓣位準及波束寬度,對實際應用有助於降低干擾,同時陣列天線的結構也提高天線的方向性,應用在車輛防撞系統中可以提升系統的訊雜比。

In this paper, We propose a compact leaky-wave Antenna array to reduce side lobe level. Since the travelling wave propagating on the antenna will leak out the energy to the free space. But due to the discontinuity at the end of the antenna that will cause the reflected wave and propagate opposite direction. Then radiate unwanted side lobe. We reuse the reflected power due to the reflected power from the end of the microstrip line can reduce the side lobe level.
The antenna array consist of 3 elements, each one has 1? long. We guided the remained reflected power and split the power equally with the same phase difference into 2 paths then inject into each antenna elements. This antenna is fabricated on FR-4 PCB and operating at 4.4GHz. And the measurement results shows gain +8.5dBi, main beam angle is about 30?a, beam width is about 40?a and side lobe level is -13dB.
This design can reduce side lobe level effectively which may reduce the interference and utilize the array structure to improve the directivity. It is suitable for vehicles avoidance collision system, point-to-point radio communication and millimeter-wave applications.

CHINESE ABSTRACT……………………………………………………i
ABSTRACT………………………………………………………………ii
ACKNOWLEDGMENTS……………………………………………………iii
TABLES OF CONTENTS…………………………………………………iv
LIST OF TABLES………………………………………………………v
LIST OF FIGURES……………………………………………………vi

Chapter 1 Introduction
1.1 Motivation………………………………………………1
1.2 Literature survey………………………………………2
1.3 Chapter organization…………………………………4

Chapter 2 Theory of Leaky-Wave Antenna
2.1 The basic operating concept………………………………………………………………5
2.2 Propagation phenomenon on MLWA……………………8
2.3 Discussion on leaky mode……………………………12
2.4 Dispersion characteristic of MLWA…………………13
2.5 Frequency scanning capability of MLWA……………15
2.6 Design of MLWA…………………………………………16

Chapter 3 Low Side Low Level LWA Design
3.1 Design of low side lobe LWA………………………19
3.2 Array theory……………………………………………20
3.3 The Antenna structure………………………………21
3.4 Simulation and Measurement Results………………24
3.5 Conclusion………………………………………………31

Chapter 4 Future Study
4.1 Future Study……………………………………………35

REFERENCES…………………………………………………………37

[1] W. Menzel, “A new travelling-wave antenna in microstrip,” Archiv. Electrnik Ubertrag Tech., pp. 137-140, Apr. 1979.
[2] A. A. Oliner and K. S. Lee, “The nature of the leakage from higher modes on microstrip line,” in Int. Microwave Symp. Digest, MTT-S, vol.86, no. 1, pp. 57-60, June 1986.
[3] Chien-Jen Wang, Hua-Lin Guan, and Christina F. Jou, “A Novel Method for Short Leaky-Wave Antennas to Suppress the Reflected Wave,” Microwave and Optical Technology Letters, vol. 36, No. 2, January 2003.
[4] I-Yu Chen, Chien-Jen Wang, Hua-Lin Guan, and Christina F. Jou, “Studies of Suppression of the Reflected Wave and Beam-Scanning Features of the Antenna Arrays,” IEEE Trans. Antennas and Propagation, vol. 53, July 2005.
[5] A. A. Oliner and K. S. Lee, “Microstrip leaky wave strip antennas,” IEEE AP-S Int. Symp. Dig., Philadelphia, PA, June 1986, pp. 443–446
[6] Y. Li, Q. Xue, E. K.-N. Yung and Y. Long, “A Fixed-Frequency Beam-Scanning Microstrip Leaky Wave Antenna Array,” IEEE Antennas and Wireless Propag. Lett., vol. 6, pp. 616-618, 2007.
[7] Y. Li, Q. Xue, E. K.-N. Yung and Y. Long, “Fixed-Frequency Dual-Beam Scanning Microstrip Leaky Wave Antenna,” IEEE Antennas and Wireless Propag. Lett., vol. 6, pp. 444-446, 2007.
[8] I. Hertl and M. Strycek, “Tapered slot antenna with reduced backward radiation,” Micow., Radar and Wireless Communications Conf. pp. 1-4, 19-21 May, 2008.
[9] W. L. Stutzman and G. A. Thiele, Antenna Theory and Design, 2nd ed. New York: John Wiley & Sons, 1998.
[10] C. A. Balanis, Antenna Theory Analysis and Design, 3rd ed. New York: John Wiley & Sons, 2005.
[11] J. D. Kraus, Antennas for all applications, 3rd ed. New York: McGraw-Hill, 2002.
[12] Ansoft High Frequency Structure Simulator (HFSS) Based on the Finite Element Method.
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