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研究生:方俐媛
研究生(外文):Li-Yuan Fang
論文名稱:具金屬背板之自組式散射體
論文名稱(外文):Self-Structuring Electromagnetic Scatterer Using a Conductor-Backed Template
指導教授:陳士元陳士元引用關係
指導教授(外文):Shih-Yuan Chen
口試委員:張道治許博文李學智
口試委員(外文):Dau-Chyrh ChangPowen HsuHsueh-Jyh Li
口試日期:2013-06-26
學位類別:碩士
校院名稱:國立臺灣大學
系所名稱:電信工程學研究所
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:2013
畢業學年度:101
語文別:英文
論文頁數:87
中文關鍵詞:自組式散射體雷達散射截面積基因演算法
外文關鍵詞:self-structuring electromagnetic scattererradar cross-sectiongenetic algorithm
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本文提出一新型具金屬背板之自組式散射體。自組式散射體係藉由金屬線段長度之改變,其散射電場相位亦隨之改變,因此運用電腦演算法計算找出最合適之金屬線段組態,調控散射體之散射場型,達到在特定方向之雷達散射截面積之最大化或最小化。此具金屬背板之自組式散射體,因金屬背板之散射電場對金屬線段散射電場造成建設性或破壞性干涉,使金屬線段長度改變時,所能調控之散射電場相位範圍大幅增加。因相位增加,使自組式散射體可控制性提升,此結構除了於單一頻率點單一角度之單目標散射場最佳化,可應用之目標角度範圍增加,本文亦更進一步討論該結構於特定角度下,具頻寬之多目標最佳化、以及於特定頻率下,多角度之散射場多目標最佳化。以上均透過電磁模擬軟體及實作量測進行驗證及討論。

A self-structuring electromagnetic scatterer (SSES) based on a novel conductor-backed template is proposed. The SSES with an embedded genetic algorithm can alter its electrical shape to fulfill different scattering objectives, such as radar cross section (RCS) reduction or beam steering of the scattering pattern. Each constituent element in this conductor-backed SSES template has a larger tuning phase range so that it outperforms the previous version without the back conducting plane. The proposed SSES template with the multiple-objective fitness function being used in the search algorithm is capable of RCS reduction or beam steering at not only one single specified direction or frequency point but also within an angular range or a frequency band. The performance of the proposed SSES is verified by both full-wave simulations and experimental measurements.

口試委員會審定書 i
誌 謝 iii
摘 要 v
Abstract vii
Contents ix
List of Figures xi
List of Tables xvii
Chapter 1 Introduction 1
1.1 Paper Survey and Motivation 1
1.2 Chapter Outline 3
Chapter 2 SSES Using Conductor-Backed Template 5
2.1 Conductor-Backed SSES Template 5
2.2 Genetic Algorithm 11
2.3 Simulation Setup 13
2.4 Measurement Setup 14
Chapter 3 SSES Performance Based on Single-Objective RCS Optimization 20
3.1 Introduction 20
3.2 Simulation Results 20
3.3 Measurement 34
Chapter 4 SSES Performance Based on Multi-Objective RCS Optimization 43
4.1 Introduction 43
4.2 Simulation 43
4.3 Measurement 70
Chapter 5 Conclusions 83
5.1 Summary 83
5.2 Future Work 84
References 85


[1] C. M. Coleman, E. J. Rothwell, J. E. Ross, and L. L. Nagy, “Self-structuring antennas,” IEEE Antennas Propagat. Mag., vol. 44, no. 3, pp. 11–23, Jun. 2002.
[2] C. M. Coleman, E. J. Rothwell, and J. E. Ross, “Investigation of simulated annealing, ant-colony optimization, and genetic algorithms for self-structuring antennas.” IEEE Trans. Antennas Propagat., vol. 52, no. 4, pp. 1007–1014, Apr. 2004.
[3] L. Greetis, R. Ouedraogo, B. Greetis, and E. J. Rothwell, “A self-structuring patch antenna: simulation and prototype,” IEEE Antennas Propagat. Mag., vol. 52, no. 1, pp. 114–123, Feb. 2010.
[4] E. J. Rothwell, C.-H. Lee, B. J. Greetis, R. O. Ouedraogo, and S.-Y. Chen, “A self-structuring 2-port network,” in IEEE AP-S Int. Symp and URSI Radio Science Meeting, Charleston, SC, Jun. 2009.
[5] R. O. Ouedraogo, E. J. Rothwell, S.-Y. Chen, and A. Temme, “A self-tuning electromagnetic shutter,” IEEE Trans. Antennas Propagat., vol. 59, no. 2, pp. 513–519, Feb. 2011.
[6] M. Paquay, J.-C. Iriarte, I. Ederra, R. Gonzalo, and P. D. Maagt, “Thin AMC structure for rad-cross section deduction,” IEEE Trans. Antennas Propagat., vol.55, no. 12, pp. 3630–3638, Dec. 2007.
[7] N. Misran, R. Cahill, and V. F. Fusco, “Reduction technique for reflectarray antennas,” Electron. Lett., vol. 39, pp. 1630–1632, 2003.
[8] W. Jiang, Y. Liu, S. X. Gong, and T. Hong, “Application of bionics in antenna radar cross section reduction,” IEEE Antennas Wireless Propag. Lett., vol. 8, pp. 1275–1278, 2009.
[9] E. Michielssen and R. Mittra, “RCS reduction of dielectric cylinders using the simulated annealing approach,” IEEE Microwave and Guided Wave Letters, vol.2, no. 2, pp. 146–148, Apr. 1992.
[10] H. Mosallaei, Y. Rahmat-Samii, “RCS reduction of canonical targets isomg genetic algorithm synthesized RAM,” IEEE Trans. Antennas Propagat., vol.48, no. 10, pp. 1594–1606, Oct. 2000.
[11] B. Chaudhury and S. Chaturvedi, “Study and optimization of plasma-based radar cross section reduction using three-dimensional computations,” IEEE Trans.Plasma Sci., vol.37, no. 11, pp. 2116–2127, Nov. 2009.
[12] H. C. Strifors and G. C. Gauanurd, “Scattering of electromagnetic pulses by simple-shaped targets with radar cross section modified by a dielectric coating,” IEEE Trans. Antennas Propagat., vol. 46, no. 9, pp. 1252–1262, Sept. 1998.
[13] S.-Y. Chen, R. O. Ouedraogo, B. J. Greetis, and E. J. Rothwell, “A reconfigurable electromagnetic scatterer,” in IEEE AP-S Int. Symp and URSI Radio Science Meeting, Charleston, SC, Jun. 2009.
[14] Y.-S. Chen, Y.-C. Chan, H.-J. Li, E. J. Rothwell, R. O. Ouedraogo, and S.-Y. Chen, “A self-structuring electromagnetic scatterer,” IEEE Trans. Antennas Propagat., vol. 60, no. 4, pp. 1931–1941, Apr. 2012.
[15] E. H. Newman and D. Forrai, “Scattering from microstrip patch,” IEEE Trans. Antennas Propagat., vol. AP-35, no. 3, pp. 254-251, Mar. 1987.
[16] J.-M. Jin and J. L. Volakis, “Electromagnetic scattering by a perfectly conducting patch array on a dielectric slab,” IEEE Trans. Antennas Propagat., vol. 38, no. 4, pp. 556-563, Apr. 1990.
[17] J. D. Kraus and R. J. Marhefka, Antennas: For All Applications. NY: McGraw-Hill, 2003, ch. 5.
[18] J. H. Holland, Adaptation in Natural and Artificial Systems. MA: A Bradford Book, 1992.
[19] E. Zitzler, M. Laumanns, and L. Thiele, “SPEA2: Improving the strength pareto evolutionary algorithm for multiobjective optimization,” in Evolutionary Methods for Design, Optimization and Control, Barcelona, Spain, 2002.


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