A Novel Dual-Mode Bandpass Filter Based on a Defected Waveguide Resonator

ETRI Journal

关键词: global positioning system (GPS);    bandpass filter;    dual-mode;    Defected ground waveguide;   

Others  :  1186031
DOI  :  10.4218/etrij.11.0211.0034

【 摘 要 】

A novel dual-mode bandpass filter (BPF) using a dual spiral-shaped defected ground waveguide (DGW) resonator is proposed in this letter. The dual-mode characteristic of this filter is achieved by loading a defected T-shaped stub at the midline of the spiral-shaped DGW resonator. Also, non-orthogonal input and output feed-lines are adopted in the filter.Based on the compact DGW structure, a dual-mode BPF with central frequency of 1.5 GHz for the global positioning system is designed, fabricated, and measured. Measured results agree well with the predicted response and verify the proposed methodology.

   

【 参考文献 】

• [1]G. Wolff, "Microstrip Bandpass Filter Using Degenerate Modes of a Microstrip Ring Resonator," Electron. Lett., vol. 8, June 1972, pp. 302-303.
• [2]L. Zhu and K. Wu, "A Joint Field/Circuit Model of Line-to-Ring Coupling Structures and Its Application to the Design of Microstrip Dual-Mode Filters and Ring Resonator Circuits," IEEE Trans. Microw. Theory Tech., vol. 47, no. 10, Oct. 1999, pp. 1938-194
• [3]J.S. Hong and M.J. Lancaster, "Microstrip Bandpass Filter Using Degenerate Modes of a Novel Meander Loop Resonator," IEEE Microw. Guided Wave Lett., vol. 5, Nov. 1995, pp. 371-372.
• [4]B.T. Tan et al., "A Modified Microstrip Circular Patch Resonator Filter," IEEE Microw. Wireless Compon. Lett., vol. 12, no. 7, July 2002, pp. 252-254.
• [5]J.S. Hong and S.Z. Li, "Theory and Experiment of Dual-Mode Microstrip Triangular Patch Resonators and Filters," IEEE Trans. Microw. Theory Tech., vol. 52, no. 4, Apr. 2004, pp. 1237-1243.
• [6]R.J. Mao and X.H. Tang, "Novel Dual-Mode Bandpass Filters Using Hexagonal Loop Resonators," IEEE Trans. Microw. Theory Tech., vol. 54, no. 9, Sept. 2006, pp. 3526-3533.
• [7]W. Hu, T. Yoshimasu, and H. Liu, "A Novel Dual-Mode Square Loop Passband Filter with Second Spurious Passband Suppression," Proc. Int. Conf. Commun., Circuits, Syst., Guilin, China, 2006, pp. 2273-2276.
• [8]W.-J Feng et al., "Novel Microstrip Bandpass Filter Based on Defected Ground Structure and Slotline Coupling Techniques," Microw. Opt. Tech. Lett., vol. 52, no. 1, Jan. 2010, pp. 4-6.
• [9]A. Mohan and A. Biswas, "Dual-Band Bandpass Filter Using Defected Ground Structure," Microw. Opt. Tech. Lett., vol. 51, no. 2, Feb. 2009, pp. 475-479.
• [10]B. Wu et al., "Compact Dual-Band Filter Using Defected Stepped Impedance Resonator," IEEE Microw. Wireless Compon. Lett., vol. 18, no. 10, Oct. 2008, pp. 674-678.
• [11]H.W. Liu et al., "Dual-Mode Dual-Band Bandpass Filter Using Defected Ground Waveguide," Electron. Lett., vol. 46, no. 13, June 2010, pp. 895-897.
• [12]B. Bhat and S.K. Koul, Stripline-like Transmission Lines for Microwave Integrated Circuits, New Delhi: New Age International Ltd., 2003, pp.7-8.