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Design of Transmission-Line Transformer and Bandpass Filter with Different Characteristic Impedances
|關鍵字:||Transmission-Line Transformer;傳輸線轉換器;bandpass filter;Arbitrary frequencies;impedance matching;帶通濾波器;特定頻率;阻抗匹配||出版社:||電機工程學系所||引用:||參考文獻  G. L. Matthaei, L. Young, and E. M. T. Jone, Microwave Filter, Impedance Matching Networks, and Coupling Structure. New York: McGraw-Hill, 1964.  I. Bahl, Lumped Elements for RF and Microwave Circuits. Boston, MA: Artech House, 2003.  R. J.Wilkinson, “An N-way hybrid power divider,”IRET rans. Microw. Theory Tech., vol. MTT-8, no. 1, pp. 116–118, Jan. 1960.  D. M. Pozar, Microwave Engineering. New York: Wiley, 1990.  D. M. Pozar, Microwave Engineering,3rd ed. John Wiley&sons,2005.  J. H. Sung et al., “Design method of a dual band balun and divider,” in IEEE MTT-S Int. Microwave Symp. Dig., Jun. 2002, pp. 1177–1180.  R. E. Collin, Foundations for Microwave Engineering, 2nd ed. New York: Wiley, 2001.  H. J. Riblet, “A general theorem on an optimum stepped impedance transformer,” IRE Trans. Microw. Theory Tech., vol. MTT-8, no. 3, pp. 169–170, Mar. 1960.  D. K. Misra, Radio Frequency and Microwave Communication Circuits.New York: Wiley, 2001.  W. Webb, The Complete Wireless Communications Professional: A Guide for Engineers and Managers. Boston, MA: Artech House, 2003.  Y. L. Chow and K. L. Wan, “A transformer of one-third wavelength in two sections—For a frequency and its first harmonic,” IEEE Microw. Wireless Compon. Lett., vol. 12, no. 1, pp. 22–23, Jan. 2002.  S. Srisathit, M. Chongcheawchamnan, and A. Worapishet, “Design and realization of a dual-band 3-dB power divider based on a two-section transmission-line topology,” Electron Lett., vol. 39, pp. 723–724, May 2003.  D. A. McClure, “Broadband transmission-line transformer family matches a wide range of impedances,” RF Design, pp. 62–66, Feb. 1994.  Mitchai Chongcheawchamnan,SumongkolPatisang, Monai Krairiksh, and Ian D. Robertson, “Tri-band Wilkinson power divider using a three-section transmission-line transformer,”IEEE microwave And wireless components letters,VOL.16,NO.8,August 2006.  G. L. Matthaei, L. Young, E. M. T. Jones “Microwave Filters, Impedance-matching networks, and Coupling Structures” Artech House, 1980.  K.C. GUPTA,Ramesh GARG,Inder BAHL,Prakash BHARTIA, Microstrip Lines and Slotlines[M].Bos ton:ARTECH HOUSE,INC.,1996. REFERENCES  Mitchai Chongcheawchamnan, Sumongkol Patisang, Sarayut Srisathit, Ravee Phromloungsri, and Sawat Bunnjaweht "Analysis and Design of a Three-Section Transmission-Line Transformer" IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, VOL. 53, NO. 7, JULY 2005.||摘要:||
This thesis includes two parts. The first part shows how to design a Three-section Transmission-Line Transformer. Nowadays the Boardband System has become more and more popular. Three-section Transmission-Line Transformer could realize the impendence match in boardband system and the return loss would decrease at three design frequencies.
When the difference of the impedance between two ports is quite small,the S11 is less than -10dB and the S21 is nearly lossless.So it could realize the impedance match in Ultra Wideband.On the other side, when the difference of the impedance between two ports is large,Although it can not realize the impedance match in Ultra Wideband, There are still at least three specific frequencies with better S21 in the thesis . That means the proposed Three-section Transmission may realize impedance match effectively at three design frequencies and may further be match in Ultra Wide Band. There are more advantages in using Three-section Transmission than using one-section Transmission or two-section Transmission .
The second parts of the thesis shows how to design a filter with
different impedance of port-1 and port-2 by using three-section Transmission and filters. Generally, the filter plays an important role in RF system. Filters could be found everywhere at the transmitter or receiver. In the thesis, the main characteristic adopts the filter with different impedance of port-1 and port-2.
Since filters and impedances are very important components in RF system,thinking of combining both be a great idea. In the thesis, our purpose is to design a filter with different impedance of port-1 and port-2 and make the designed filter have the ability to achieve the impedance match and to filter the signal.
The validity of the three-section Transmission and the designed filter with different impedance of port-1 and port-2 are demonstrated by numerous results from analysis, simulation, and experiment.
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