博碩士論文 101521050 詳細資訊




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姓名 吳忠倫(Zhong-lun Wu)  查詢紙本館藏   畢業系所 電機工程學系
論文名稱 應用於X-band平面吸波器之薄型負載電路設計
(Design of Thin Loads for X-band Planar Absorbers)
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摘要(中) 本論文主要基於頻率選擇表面(或稱週期性結構,或在光學中稱為光子晶體)設計取代傳統的Salisbury screen 所製作之電阻表面電路模擬雷達吸波結構,雖然在過去的文獻中已有所謂的最佳化設計,但其往往需要使用介電系數非常特殊的材料,使得其設計變得不太實際。基於規格要求,我們分析頻帶內適合使用的材料,先在負載端設計一頻率選擇面與材料虛部阻抗匹配,並參考文獻設計Jaumann多層介質結構的電磁波吸波器,利用四分之一波長阻抗轉換器原理,在選定的材料上設計阻抗轉換器,達成阻抗匹配且設計符合實際上可製作的吸波器,以活化並充分利用現有資源,論文中也以全波模擬軟體與實驗來驗證設計理論。本論文製作之寬頻吸波器量測結果與全波模擬有相同的趨勢且有良好的吻合度。本論文所設計完成的寬頻吸波器可應用於X頻段的衛星通訊系統。
摘要(英) In the thesis, based on the design of periodic structure (photonic bandgap, or frequency selective surface), a circuit analog radar absorbing structures (RAS) is fabricated by replacing the resistive sheet of a Salisbury screen by a frequency selective surface (FSS). In the literature, related research and design methods have been proposed. But the optimal designs have to use very specific dielectric coefficient of the material. So, the design is not so easy to achieve. Based on the specification of the absorber, we will analyze the frequency band of suitable material. First, we will design the frequency selective surface (FSS) to match the imaginary part of the impedance of the material. Then, to refer the literature of the Jaumann multi-layered structure, we design the impedance converter on the load by the principle of one-quarter wavelength impedance converter. It will be well-matching and realistic. The validity of the procedure is verified using full-wave EM simulations and experimental characterization of a fabricated prototype of the proposed thin loads for X-band planar absorbers. The proposed thin loads for X-band planar absorbers can be used in X-band satellite communications systems.
關鍵字(中) ★ 吸波器 關鍵字(英) ★ Absorbers
論文目次 摘要 i
Abstract ii
致謝 iii
圖目錄 vi
表目錄 x
第一章 緒論 1
1-1 前言 1
1-2 研究動機 2
1-3 文獻回顧 4
1-4吸收體規格選定 10
1-5 章節介紹 11
第二章 吸收體基板之設計與分析 12
2-1 理論分析 12
2-2實驗材料選取 13
2-3材料厚度分析 20
2-4吸波材料匹配設計 22
2-5參數分析 34
第三章 寬頻吸收體設計 39
3-1 阻抗轉換器電路設計 39
3-1-1 四分之一波長阻抗轉換器簡介 39
3-1-2 阻抗轉換器設計理論 40
3-1-3 阻抗轉換器等效電路 41
3-1-4 阻抗轉換器實現之電磁模擬與參數分析 44
3-2 斜向入射分析 51
第四章 量測結果 53
4-1 簡介 53
4-2 平面波透射吸波器之量測 55
4-3 結論 59
第五章 總結 60
參考文獻 61
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[2] 孫長春,「錳鋅鐵氧磁體低頻電磁波吸波特性研究」,黎明技術學院,黎明學報,民國91年。
[3] 謝子皓,「雙頻圓極化微波極化器設計」,國立中央大學,碩士論文,民國102年。
[4] Zahra Atlasbaf,“A Circuit Analog Absorber With Optimum Thickness and Response in X-Band”IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS, VOL. 12, 2013
[5] S. Chakravarty, R. Mittra, and N. R. Williams, “On the application of the microgenetic algorithm to the design of broadband microwave absorbers comprising frequency-selective surfaces embedded in multilayered dielectric media,” IEEE Trans. Microw. Tech., vol. 49, no. 6, pp. 1050–1059, Jun. 2001
[6] Olli Luukkonen, Filippo Costa, Constantin R. Simovski, Agostino Monorchio, and Sergei A. Tretyakov, “A thin electromagnetic absorber for wide incidence angles and both polarizations,” IEEE Trans. Antennas Propag., vol. 57, no. 10, pp. 3119–3125, Oct. 2009.
[7] Filippo Costa, Agostino Monorchio, and Giuliano Manara, “Analysis and design of ultra thin electromagnetic absorbers comprising resistively loaded high impedance surfaces,”
[8] Yuri N. Kazantsev, Alexander V. Lopatin, Natalia E. Kazantseva, Alexander D. Shatrov, Valeri P. Mal’tsev, Jarmila Vilcáková, and Petr Sáha,“Broadening of Operating Frequency Band of Magnetic-Type Radio Absorbers by FSS “IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, VOL. 58, NO. 4, APRIL 2010
[9] David K. Cheng, Fundamentals of Engineering Electromagnetics,1992
[10] D. M. Pozar, Microwave Engineering, 3nd ed. New York:Wiley, 2005.
[11] Woonphil Kim, Bomson Lee (2002) Modelling and design of 2D UC-PBG structure
using transmission line theory。IEEE Antennas and Propagation Society
International SymposiumS.-C. Chiu and S.-Y. Chen, “High-gain circularly polarized resonant cavity antenna using FSS superstrate, ” in Proceedings IEEE International Symposium on Antennas and Propagation, July 2011, pp. 2242-2245.
[12] Michael Steer, Microwave and RF Design: A Systems Approach.2010
[13] NAVAL Air Warfare Center, Electronic Warfare and Radar System Engineering Handbook, Washington, D.C, Naval Air Systems Command Avionics Department Press, April 1999.
指導教授 丘增杰(Tsen-chieh Chiu) 審核日期 2014-7-30
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