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研究生:侯語辰
研究生(外文):Hou, Yu-Chen
論文名稱:Ka頻段高功率雙通道微波旋轉耦合器
論文名稱(外文):Ka-band High Power Dual-Channel Microwave Rotary Joint
指導教授:張存續
指導教授(外文):Chang, Tsun-Hsu
學位類別:碩士
校院名稱:國立清華大學
系所名稱:物理系
學門:自然科學學門
學類:物理學類
論文種類:學術論文
論文出版年:2013
畢業學年度:101
語文別:中文
論文頁數:78
中文關鍵詞:微波旋轉耦合器TE01模式轉換器TM01模式轉換器
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高功率多通道微波旋轉耦合器(Microwave Rotary Joint)是雷達系統中的關鍵角色。本論文將分別探討圓形TE01及TM01模式轉換器的高功率設計方案,由於TE01與TM01的場型彼此正交並兼具圓對稱特性,將兩組雙模式轉換器共軸心對接後可形成具有高隔離度且穿透效率不受旋轉角度影響的雙通道微波旋轉耦合器。利用HFSS模擬理論設計,考慮截止頻率因素,TM01模式轉換器的輸出端必須銜接TE01模式轉換器的截止端,接合處的結構經過優化以降低反射;對接雙模式轉換器的旋轉端因加入培林而存在間隙,須另外設計微波扼流結構(Choke)以防止TM01波外洩。
實驗結果顯示TE01及TM01模式轉換器均能達到穿透效率-1dB以上極寬的頻寬(15%),雙模操作頻帶高度重疊且具有-50dB的極佳隔離度,穿透效率不受旋轉角度影響。

High power, multi-channel microwave rotary joint plays a critical role in radar systems. This thesis proposes the high power designs of circular TE01 and TM01 mode converters respectively. Due to the orthogonality of the field profile between TE01 and TM01 mode, a pair of the high power, dual-mode converters with back-to-back connection can be developed into a high isolation, dual-channel microwave rotary joint. HFSS is employed to separately design every component. Considering the effect of the cutoff frequency, TM01 wave must pass through the cutoff section of the TE01 mode converter. The connecting section is important for the converting efficiency, the operating bandwidth, and the isolation for the dual-mode converter. A gap for implanting a bearing exists in the middle channel of the rotary joint, therefore, a microwave choke is designed to prevent the leakage of TM01 wave.
The experimental result yields a broad -1-dB transmission bandwidth of 15% for both TE01 and TM01 channels. The operating bandwidth for dual channels is highly overlapped with a high isolation of -50-dB between the channels. The transmission efficiency is independent of rotated angles since the field profile of TE01 mode and TM01 mode are azimuthal symmetric.

摘要
Abstract
致謝
第一章 緒論
1.1 旋轉耦合器簡介
1.2 模式轉換器簡介
1.3 HFSS模擬軟體
第二章 理論介紹
2.1 波導管模式分析
2.2 波導管表面電流
2.3 波導管模式衰減常數
第三章 模擬結果
3.1 間隙對模式之影響
3.1.1 間隙寬度對模式之影響
3.1.2 間隙長度對模式之影響
3.2 TE01模式轉換器
3.2.1 TE01模式轉換結構
3.2.2 TE01分波器設計
3.2.3 對接TE01模式轉換器
3.3 TM01模式轉換器
3.3.1 TM01模式轉換結構
3.3.2 TM01分波器設計
3.3.3 TM01模式轉換器模擬
3.4 Ka頻段雙通道微波旋轉耦合 器
3.4.1 微波扼流結構
3.4.2 連接TM01與TE01模式轉換器
3.4.3 雙通道旋轉耦合器模擬
3.5 高功率及熱模擬分析
3.5.1 電場強度分析
3.5.2 高功率操作熱模擬
第四章 實驗結果
4.1 加工物件
4.2 元件S參數量測
4.2.1 實驗裝置
4.2.2 實驗量測---TE01模式轉換器
4.2.3 實驗量測---TM01模式轉換器
4.2.4 實驗量測---雙模隔離度
第五章 結論
附錄A
參考文獻
[1]Inventor: Clifford W. Fischer, Englewood, Colo. Assignee: Texas Instruments Incorporated, Dallas, Tex. “Radar Rotary Joint”, United States Patent 4654613
(Mar. 31, 1987).
[2]O.M. Woodward, “A Dual-Channel Rotary Joint for High Average Power Operation”, IEEE, Vol. MTT-18(1970).
[3]Inventor: Subir Ghosh and Luiz C. Da Silva. Assignee: SG Microwaves Inc. “Waveguide Rotary Joint and Mode Transducer Structure Therefore,” United States Patent 5442329(Aug. 15, 1995).
[4]Inventor: Thomas Hudspeth, Malibu, Harold A. Rosen, Santa Monica, both of Calif. Assignee: Hughes Aircraft Company, Culver City, Calif. “Multiple Channel Rotary Joint”, United States Patent 4117426(Sep. 26, 1978).
[5]http://www.microwaves101.com/encyclopedia/waveguidedimensions.cfm
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[7]http://www.spinner-group.com/upload/Article_RJ_1472.pdf
[8]http://quinstar.com/antenna/rotary-joints-qrj-series/
[9]http://www.gigacomp.ch/pdfs/Diamond_legacy_rotary_joint_catalog.pdf
[10]http://www.jittc.com.tw/productB_A.htm
[11]T.H. Chang, C.H. Li, C.N. Wu and C.F. Yu, “Generating Pure Circular TEmn Modes Using Y-Type Power Dividers” , IEEE, Vol. 58, No. 6(2010).
[12]李明洋,HFSS電磁仿真設計應用詳解,北京:人民郵電出版社(2010)。
[13]John David Jackson, Classical Electrodynamics ,3rd ed., John Wiley & Sons Inc.(1999), Chap. 8.
[14]David M. Pozar, Microwave Engineering, 3rd ed., John Wiley & Sons Inc.(2005), Chap. 3.
[15]K.R. Chu, “Microwave Physics and Applications” Handout, Hsinchu, National Tsin Hua University.
[16]K.R. Chu., C.S. Kou, J.M. Chen, Y.C. Tsai, C. Cheng, S.S. Bor and L.H. Chang, “Spectral Domain Analysis of Open Cavities” , International Journal of Infrared and Millimeter Waves, Vol. 13, No.10(1992).
[17]C.F. Yu and T.H. Chang, “High-Performance Circular TE01-Mode Converter” , IEEE, Vol.53, No. 12(2005).
[18]T.H. Chang, C.H. Li, C.N. Wu and C.F. Yu, “Exciting circular TEmn modes at low terahertz region”, Appl. Phys. Lett. 93, 111503 (2008).
[19]吳俊潭,雙通道旋轉接頭,國立清華大學物理研究所(2010)。
[20]H.J. Riblet and R.L. Williston, “X-Band Rotary Joint”, Microwave Theory and Techniques, IEEE Transactions on, Vol.1, pp.23-24(1953).
[21]A. H. McCurdy, “Design and Analysis of a Coaxial Coupler for a 35-GHz Gyroklystron Amplifier,” IEEE, Vol. 47, No. 2(1999).
[22]陳乃慶,TE01模磁旋返波振盪於模式選擇線路之研究,國立清華大學物理研究所(2008)。
[23]T.H. Chang and B.R. Yu, “High power millimeter-wave rotary joint”, Rev. Sci. Instrum. Vol. 80, 034701(2009).

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