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http://dx.doi.org/10.5573/JSTS.2011.11.1.065

Bandpass Filters using T-shape Stepped Impedance Resonators for Wide Harmonics Suppression and their Application for a Diplexer  

Lerdwanittip, Reungyot (Department of Electrical Engineering, Faculty of Engineering, King Mongkut's University of Technology North Bangkok)
Namsang, Apirada (Department of Electrical Engineering, Faculty of Engineering, King Mongkut's University of Technology North Bangkok)
Akkaraekthalin, Prayoot (Department of Electrical Engineering, Faculty of Engineering, King Mongkut's University of Technology North Bangkok)
Publication Information
Abstract
In this paper, the T-shape stepped impedance resonators are adopted for the design of microstrip bandpass filters for wide harmonics suppression. The proposed filters are operated at the center frequency of 2.44 GHz and 5.20 GHz, respectively. These bandpass filters have been also applied for a high performance diplexer. The insertion losses at the center frequencies of 2.44 and 5.20 GHz are 1.23 and 1.18, respectively. The applicable return losses for both frequency bands and a wide stopband better than 17 dB up to 20 GHz have been obtained.
Keywords
Bandpass filter; diplexer; T-shape stepped impedance resonator; harmonics suppression;
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1 Reungyot Lerdwanittip, Apirada Namsang, Prayoot Akkaraekthalin, “A banspass filter using asymmetrical stepped impedance resonators and hook feed lines for harmonic suppression,” ITCCSCC2010., pp.1160-1163, July, 2010.
2 Zeland Software, Inc, IE3D, NewYork.
3 J. S. Hong and M. J. Lancaster, “Theory and Experiment of Novel Microstrip Slow-Wave Open-Loop Resonator Filters,” IEEE Trans. Microwave Theory Tech, Vol.45, No.12, pp.2358-2356, Dec., 1997.   DOI   ScienceOn
4 G. L. Matthaei, N.O. Fenzi, R. J. Forse, and S. M. Rochlfing, “Hairpin comb filters for HTS and other narrowband applications,” IEEE Trans. Microw. Theory Tech., Vol.45, No.8, pp.1226-1231, Aug., 1997.   DOI   ScienceOn
5 S.B. Cohn, “parallel coupled transmission-line resonator filters,” IRE Trans. Microw. Theory Tech., vol. MTT-6, No.4, pp.223-231, Apr., 1958.
6 Yu-Wei Chen, Yen-Ju Liu, and Min-Hua Ho, “The Quasi-elliptic Bandpass Filter Using Quarterwavelength Stepped Impedance Resonators,” PIERS Online, Vol.2, No.6, pp.605-608, 2006.   DOI
7 C.-H. Lee, C.-I. G. Hsu, and L.-Y. Chen, “Bandnotched ultra-wideband bandpass filter design using combined modified quarter-wavelength trisection stepped-impedance resonator,” IET Microwaves Antennas & Propagation, Vol.3, No.8, pp.1232-1236, 2009.   DOI   ScienceOn
8 B. Easter and K. A. Merza, “Parallel-coupled-line filters for inverted-microstrip and suspended substrate MIC’s,” in 11th Eur. Microwave Conf. Dig., 1981, pp.164-167.
9 C. F. Chen, T. Y. Huang, and R. B. Wu, “Design of microstrip bandpass filters with multiorder spurious mode suppression,” IEEE Trans. Microw. Theory Tech, Vol.53, No.12, pp.3788-3793, Dec., 2005.   DOI   ScienceOn
10 C. Quendo, E. Rius, C. Person, and M. Ney, “Integration of optimized low-pass filters in a bandpass filter for out-of-band improvement,” IEEE Trans. Microw. Theory Tech., Vol.49, pp.2376–2383, Dec., 2001.   DOI   ScienceOn
11 E. G. Cristal and S. Frankel, "Hairpin-line and hybrid hairpin-line/half-wave parallel-coupled filters," IEEE Trans. Microw. Theory Tech., Vol. MTT-20, No.11, pp.719-728, Nov., 1972.   DOI
12 J.-T. Kuo and E. Shih, “Stepped impedance resonator bandpass filters with tunable transmission zeros and its application to wide stopband design,” in IEEE MTT-S Int. Microwave Symp. Dig, pp.1613–1616, 2002.
13 A. Namsang, T. Majaeng, J. Jantree, A. Chaimool and P. Akkaraekthalin, “Stepped-impedance hairpin resonators with asymmetric capacitively loaded coupled lines for improved stopband characteristics,” IEICE Trans.Elecron.,vol.E90-C, No.12, pp 2185-2191, Dec., 2007.   DOI
14 D. M. Pozar, Microwave Engineering, 2nd ed. New York: Wiley, 1998, ch8.