臺灣博碩士論文加值系統

近年來，全球通信市場蓬勃發展，微波電路更是通訊系統中不可缺少的技術，也廣泛的被應用在無線區域網路系統(Wireless Local Area Network)中。由於射頻前端(RF front-end)是由 RF放大器、振盪器、混波器、濾波器所構成，其中濾波器更是電路中訊號純化的關鍵部分之一，因此本論文提出一個符合無線區域網路規格IEEE802.11b協定及個人行動通訊PHS的帶通濾波器設計。
本論文的重點是利用橢圓函數的合成方式,在有限範圍內產生一對傳輸零點，來設計出窄頻高選擇性的帶通濾波器,並使用全波分析電磁模擬軟體(IE3D)來進行模擬與討論，最後也將該電路實現並量測出與模擬特性幾乎吻合的結果。

Recently, because of the rapidly growing of global communication market, RF circuits are indispensable in communication systems, and they have been applied in Wireless Local Area Network (WLAN). RF front- end is composed of RF Amplifier, Oscillator, Filter, and Mixer. Filter is the important part of purifying the signal in circuits. Thus, the purpose of this paper is to design a Band-Pass Filter which satisfies the IEEE 802.11b [1] WLAN protocols and the Personal Handyphone System (PHS).

In this paper, we use the Elliptic function synthesis method which produces a pair of zeros at finite frequencies to design a highly selective bandpass filter, and use the full-wave EM simulator (IE3D) in simulation. By implementing and simulating, we show that the theoretical and experimental performances are consistent.

目錄

中文摘要 i
Abstract ii
誌謝 iii
目錄 iv
圖目錄 vii
表目錄 x
第一章 簡介 1
1.1 研究動機與目的 1
1.2 章節概要 2
第二章 傳輸線的基本理論與微帶線模型 3
2.1 傳輸線原理說明 3
2.1.1傳輸線定義 3
2.1.2 傳輸線上的電波傳播 5
2.1.3 有載的無損傳輸線 6
2.1.4 濾波器的參數 9
2.1.4.1 介入損失(Insertion Loss) 10
2.1.4.2 反射損失(Return Loss) 10
2.1.5 傳輸ABCD矩陣 11
2.2 微帶線架構 14
2.2.1 微帶線與平行耦合線之關係 16
2.2.2 奇偶模之電容 16
2.2.3 殘斷元件之等效電路 17
2.2.3.1 不連續之連接面(step) 18
2.2.3.2 開路端(open end) 19
2.2.3.3 缺口(gap) 20
2.2.3.4 轉角處(bend) 21
2.3平行耦合線轉換阻抗與導納之關係矩陣 21
2.4 開路平行耦合線分析 23
2.5 微小化髮夾式諧振器的種類 24
2.5.1 諧振條件 25
2.5.2 諧振點的等效電路 26
第三章 濾波器的合成與分析 27
3.1 濾波器的轉移函數 27
3.1.1 柴比雪夫函數的響應 27
3.1.2 橢圓函數的響應 28
3.2 低通濾波器原型 29
3.2.1 柴比雪夫低通濾波器原型 30
3.2.2 橢圓函數低通濾波器原型 32
3.3 低通濾波器原型轉帶通濾波器 34
3.4 具傳輸零點之選擇性濾波器設計 36
3.5 帶通濾波器的設計與合成 37
第四章 諧振器耦合結構 43
4.1 耦合的基本觀念 43
4.2 三種耦合結構 44
4.3 耦合係數模擬的相關公式 45
4.3.1 電場耦合 46
4.3.2 磁場耦合 48
4.3.3 混模耦合 50
4.4 諧振器之Q值 53
第五章 模擬與實驗結果 56
5.1 應用於微波通訊之髮夾諧振帶通濾波器設計 57
5.2應用於PHS之微波通訊髮夾帶通濾波器設計 66
第六章 結論 71
參考文獻 72
Publication List 75

[1] Bob O’Hara, Al Petrick., The IEEE 802.11 handbook, New York, Standards Information Network, IEEE Press, 1999.
[2] D.M. Pozar, Microwave Engineering, Addison Wesley, 1998.
[3] Kai chang , Bahl , Nair “RF and Microwave Circuit and Component Design for Wireless System” John Wiley & Sons, New York 2002.
[4] Jia-Shaeng Hong, M.J. Lancaster, “Microstrip Filters for RF/Microwave Applications”, Addison Wesley, 2001.
[5] R. Garg and I. J. Bahl, “Characteristics of coupled microstriplines,” IEEE Trans., MTT-27, July 1979, 700-705. Corrections in IEEE Trans., MTT-28, March 1980, p.272.
[6] K. C. Gupta, R. Garg, I. Bahl, and P. Bhartis, Microstrip Lines and Slotlines, Second Edition, Artech House, Boston, 1996.
[7] T. Edwards, Foundations for Microstrip Circuit Design, Second Edition, Wiley, Chichester, U.K., 1991.
[8] B. Easter, “The equivalent circuit of some microstrip discontinuities,” IEEE Trans., MTT-23, Aug. 1975, pp.655-660.
[9] Zysman,G.I.;Johnson, A.K.,”Coupled Transmission Line Networks in an Inhomo- geneous Dielectric Medium,” Microwave Theory and Techniques.IEEE Transaction on, Volume:17,pages:753-759,Oct 1969.
[10] Sagawa, M.; Takahashi, K.; Makimoto, M., “Miniaturized hairpin resonator filters and their application to receiver front-end MICs,” Microwave Theory and Techniques, IEEE Transaction on, Volume: 37, Pages: 1991-1997,Dec 1989.
[11] M. Makimoto and M. Sagawa, “Varactor tuned bandpass filters using microstrip -line ring resonators.” in IEEE MTT-S Int. Mi-crowave Svmp. Dig., May 1986, pp. 411-414.
[12] M. Makimoto “Mmostrip-line split-ring resonatcrs and their appli-cation to bandpass filters,” Trans. IEICE Japan, vol. J71-C, no. 7,pp. 1063-1070, July 1988.
[13] M. Makimoto and S. Yamashita, “Bandpass filters using parallel coupled stripline stepped impedance resonators,” IEEE Trans.Microwave Theory tech., vol. MTT-28 , pp. 1413-1417 , Dec. 1980.
[14] Jen-Tsai Kuo; Ming-Jyh Maa; Ping-Han Lu, “A microstrip elliptic function filter with compact miniaturized hairpin resonators” Volume10, Pages:94-95, March 2000.
[15] T. Milligan. Nomographs aid the filter designer. Microwave & RF 1985;24: pp.103-107.
[16] R. Levy, “Filters with single transmission zeros at real and imaginary frequenc-
ies,” IEEE Trans.,MTT-24,1976,pp.172-181.
[17] J.-S. Hong, M. J. Lancaster, R. B. Greed, and D. Jedamzik, “Highly selective microstrip bandpass filters for HTS and other applications,” Proceedings of The 28th European Microwave Conference, October 1998, Amsterdam, The Netherlands.
[18] J.-S. Hong and M.J.Lancaster, “Design of Highly Selective Microstrip bandpass filters with a Single Pair of attenuation Poles at finite frequencies”, IEEE Trans.,MTT-48, July 2000, 1098-1107.
[19] G. Matthaei , L. Young , and E. M. T. Jones , “ Microwave Filters , Impedance-
Matching Networks, and Coupling structures ,” New York:McGraw-Hill , 1980.

[20] J. S. Hong, “Couplings of asynchronously tuned coupled microwave resonators,”
IEE Proc.Microwaves,Antennas and Propagation,147,Oct.2000,354-358.
[21] EM User’s, Manual, Sonnet Software Inc., New York 1993.
[22] J. S. Hong, “ Microstrip tapped-line filter design,” IEEE Trans.Microwave Theory Tech., vol.MTT-27, pp. 44-50 , jan. 1979.
[23] http://www.rogers-corp.com/mwu/