Journal of electromagnetic engineering and science

The Korean Institute of Electromagnetic Engineering and Science (한국전자파학회)
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Tunable Combline Bandpass Filter Using Cross-Coupled Stepped-Impedance Resonators with Enhanced Characteristics

  • Kim, Yoon-Hong (Dept. of Electronic Engineering, Sogang University) ;
  • Cho, Young-Ho (Dept. of Electronic Engineering, Sogang University) ;
  • Yun, Sang-Won (Dept. of Electronic Engineering, Sogang University)
  • Published : 2008.12.31
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Abstract

This paper proposes a tunable combline bandpass filter with high selectivity, constant bandwidth, and good stopband performances. A filter with these characteristics is obtained by applying cross-coupling to the conventional combline bandpass filter using stepped-impedance resonators(SIRs). For high selectivity and constant bandwidth, cross-coupling is utilized and the SIR configuration is used for enhanced stopband performances. The proposed combline tunable bandpass filter with 5% of fractional bandwidth at 1.6 GHz was fabricated and tested. The measured results showed 11.6% tunability with constant bandwidth, high selectivity and enhanced stopband characteristics.

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References

  1. M.-S. Chung, I.-S. Kim, and S.-W. Yun, "Varactor-tuned hairpin bandpass filter with enhanced stopband performance", 2006 Asia-Pacific Microwave Conference Digest, Dec. 2006
  2. M. Sanchez-Renedo, "High-selectivity tunable planar combline filter with source/load-multiresonator coupling", IEEE MWCL, Jul. 2007
  3. H. J. Park, J. Y. Park, J. C. Lee, J. M. Kim, B. Lee, N. Y. Kim, and U. S. Hong, "A new varactor-tuned microstrip ring bandpass filter with harmonic suppression", 2000 Asia-Pacific Microwave Conference Digest, pp. 1127-1130, Dec. 2000
  4. B.-W. Kim, S.-W. Yun, "Varactor-tuned combline bandpass filter using step-impedance microstrip lines", IEEE Transactions on Microwave Theory and Techniques, vol. 52, no. 4, pp. 1279-1283, Apr. 2004 https://doi.org/10.1109/TMTT.2004.825626
  5. B.-W. Kim, Y.-H. Chun and S.-W. Yun, "Varactor-tuned active bandpass filter with low noise performance", Electronics Letters, Jul. 2004
  6. J.-S. Hong, M. J. Lancaster, Microstrip Filters for RF/Microwave Applications, New York: Wiley, 2001
  7. C.-F. Chen, T.-Y. Huang, and R.-B. Wu, "Compact microstrip cross-coupled bandpass filters using miniaturized stepped impedance resonators", 2005 Asia- Pacific Microwave Conference Digest, vol. 1, pp. 1127-1130, Dec. 2005
  8. M. Makimoto, S. Yamashita, Microwave Resonator and Filters for Wireless Communication, New York: Springer, 2000
  9. C.-C. Chen, Y.-R. Chen, and C.-Y. Chang, "Miniaturized microstrip cross-coupled filters using quarter-wave or quasi-quarter-wave resonators", IEEE Transactions on Microwave Theory and Techniques, vol. 51, pp. 120-130, Jan. 2003 https://doi.org/10.1109/TMTT.2002.806924
  10. Ali E. Atia, Albert E. Williams, "Narrow-bandpass waveguide filters", IEEE Transactions on Microwave Theory and Tech., vol. 20, pp. 258-265, Apr. 1972 https://doi.org/10.1109/TMTT.1972.1127732