臺灣博碩士論文加值系統

本論文提出一個具轉角設計的雙頻濾波器。由於這個轉角的設計，發現在不影響濾波器的雙頻通帶響應下，其高頻諧波響應有將-30dB的抑制,且我們可調整共振腔的長度來控制第二個頻道的頻率。同時，可藉由改變共振腔來得到想要的頻寬。為了證明所提出濾波器有以上的特性，我們實作四個有不同共振腔長度的濾波器，由量測的結果說明，這種有轉角的雙頻濾波器，其高頻諧波平均可以抑制在-25dB以下。

In this thesis, we proposed a planar dual-bandpass filter with bend design. With this bend structure, the higher harmonics response of the proposed dual-bandpass filter can have a suppression of nearly -30dB; meanwhile, the first and the second pass-band specifications remain unchanged. Besides, we found that the second pass-band frequency is tunable by adjusting the length of each cavity. In order to demonstrate the proposed filter performance, four filters with different cavity length were implemented on a low-loss dielectric substrate. In addition to changing the length of each cavity, we changed the aperture length to observe the variation of pass-band bandwidth. From the simulated and measured results, the proposed filter obtains more than -25 dB suppression in average. The measurement shows a very good agreement with simulation.

Chinese Abstract Ⅰ
English Abstract Ⅱ
Acknowledgements Ⅲ
Contents Ⅳ
List of Figures Ⅴ
Chapter I Introduction 1
Chapter Ⅱ Structure configuration and fabrication
process 3
Chapter Ⅲ The numerical and experimental results 6
Chapter Ⅳ Conclusion 36
Bibliography 38

[1] B. N. Das, K. V. S. V. R. Prasad, and K. V. Seshagiri Rao, “Excitationof waveguide by stripline and microstrip-line-fed slots,” IEEE Trans.Microwave Theory Tech., vol. MTT-34, pp. 321–327, Mar. 1986.

[2] W. Grabherr, B. Huder, and W. Menzel, “Microstrip to waveguide transition compatible with MM-wave integrated circuits,” IEEE Trans. Microwave Theory Tech., vol. 42, pp. 1842–1843, Sept. 1994.

[3] T. Q. Ho and Y. Shih, “Spectral-domain analysis of E-plane waveguide to microstrip transitions,” IEEE Trans. Microwave Theory Tech., vol. 37,pp. 388–392, Feb. 1989.

[4] L. J. Lavedan, “Design of waveguide-to-microstrip transitions specially suited to millimeter-wave applications,” Electron. Lett., vol. 13, Sept.1977.

[5] K.Wu, “Integration and interconnect techniques of planar and nonplanar structures for microwave and millimeter-wave circuits-current status and future trend,” in Proc. Asia–Pacific Microw. Conf., Taiwan, R.O.C., Dec.2001, pp. 411–416.

[6] D. Deslandes and K. Wu, “Single-substrate integration technique of planar circuits and waveguide filters,” IEEE Trans. Microw. Theory Tech., vol. 51, no. 2, pp. 593–596, Feb. 2003.

[7] S. Germain, D. Deslandes, and K. Wu, “Development of substrate integrated waveguide power dividers,” in Proc. Can. Electr. Comput. Eng. Conf., vol. 3, May 2003, pp. 1921–1924.

[9] Xiaoping Chen, Wei Hong, E, Tiejun Cui, Jixin Chen, and Ke Wu,“Substrate integrated waveguide (SIW) linear phase filter,” IEEE Trans. Microw. Theory Tech., , vol. 15, no. 11, Nov. 2005

[10]Y. L. Kuo and K. L. Wong, “Printed double-T monopole antenna for 2.4/5.2 GHz dual-band WLAN operations,” IEEE Trans. Antennas Propag., vol. 51, no. 9, pp. 2187–2192, Sep. 2003.

[11]H. Hashemi and A. Hajimiri, “Concurrent multiband low-noise amplifiers theory, design and applications,” IEEE Trans. Microw. Theory Tech., vol. 50, no. 1, pp. 288–301, Jan. 2002.

[12] H. Miyake, S. Kitazawa, T. Ishizaki, T. Yamada, and Y. Nagatomi, “A miniaturized monolithic dual band filter using ceramic lamination technique for dual mode portable telephones,” in IEEE MTT-S Int. Dig.,1997, pp. 789–792.

[13]S. F. Chang, Y. H. Jeng, and J. L. Chen, “Dual-band step-impedance bandpass filter for multimode wireless LANs,” Electron. Lett., vol. 40, pp. 38–39, Jan. 2004.

[14]L. C. Tsai and C. W. Hsue, “Dual-band bandpass filters using equal length coupled serial-shunted lines and Z-transform technique,” IEEE Trans. Microw. Theory Tech., vol. 52, no. 4, pp. 1111–1117, Apr. 2004.

[15]H. Miyake, S. Kitazawa, T. Ishizaki, T. Yamada, and Y. Nagatomi, “A miniaturized monolithic dual band filter using ceramic lamination technique for dual mode portable telephones,” in IEEE MTT-S Int. Dig.,1997, pp. 789–792.

[16]D. Deslandes, and K. Wu, "Integrated microstrip andrectangular waveguide in planar form," IEEE Microwaveand Guided Wave Letters, vol. 11, no. 2, pp.