Journal of electromagnetic engineering and science

The Korean Institute of Electromagnetic Engineering and Science (한국전자파학회)
권호 표지
DOI QR코드

DOI QR Code

Cross-Coupled Microstrip Combline Bandpass Filter Using Stepped-Impedance Resonators

  • Cho, Young-Ho (Dept. of Electronic Engineering, Sogang University) ;
  • Choi, Seung-Un (Dept. of Electronic Engineering, Sogang University) ;
  • Yun, Sang-Won (Dept. of Electronic Engineering, Sogang University)
  • Published : 2007.12.31
Download PDF
⟨ Previous Next ⟩

Abstract

In this paper, a cross-coupled microstrip combline bandpass filter using stepped-impedance resonators(SIRs) is proposed. In order to improve the selectivity as well as the insertion loss, the SIR configuration is used. The cross coupling is also introduced to enhance the selectivity. The improvement of the insertion loss is demonstrated not only by deriving the quality factor of the SIR but through the measured performances. Both the proposed and the conventional combline bandpass filter with 5 % of fractional bandwidth at 2 GHz were fabricated and tested. Compared to the conventional combline bandpass filter, the proposed one exhibits the improved selectivity as well as the lower insertion loss characteristics.

Keywords

References

  1. Y.-H. Chun, J.-R. Lee, and S. W. Yun, 'Design of an RF low-noise bandpass filter using active capacitance circuit, IEEE Trans. Microwave Theory Tech., vol. 53, no. 2, pp. 687-695, Feb. 2005 https://doi.org/10.1109/TMTT.2004.840565
  2. J.-S. Hong, M. J. Lancaster, 'Couplings of microstrip square open-loop resonators for cross-coupled planar microwave filters', IEEE Trans. Microwave Theory Tech., vol. 44, pp. 2099-2109, Nov. 1996 https://doi.org/10.1109/22.543968
  3. Ching-Luh Hsu, Jen-Tsai Kuo, 'Design of cross- coupled quarter-wave sir filters with plural transmission zeros', IEEE MTT-S, pp. 1205-1208, Jun. 2006
  4. J.-T. Kuo, EB. Shih, 'Microstrip stepped-impedance resonator Frequency(GHz) bandpass filter with an extended optimal rejection bandwidth', IEEE Trans. Microwave Theory Tech., vol. 51, no. 5, pp. 1554- 1559, May 2003 https://doi.org/10.1109/TMTT.2003.810138
  5. Shih-Fong Chao, Chao-Huang Wu, Zou-Ming Tsai, Huei Wang, and Chun Hsiung Chen, 'Electronically switchable bandpass filters using loaded stepped- impedance resonators', IEEE Trans. Microwave Theory Tech., vol. 54, no. 12, Dec. 2006
  6. Chi-Feng Chen, Ting-Yi Huang, and Ruey-Beei Wu, 'Compact microstrip cross-coupled bandpass filters using miniaturized stepped impedance resonators', APMC 2005, vol. 1, Dec. 2005
  7. Shih-Cheng Lin, Pu-Hua Deng, Yo-Shen Lin, Chi- Hsueh Wang, and Chun Hsiung Chen, 'Wide-stopband microstrip bandpass filters using dissimilar quarter- wavelength stepped-impedance resonators', IEEE Trans. Microwave Theory Tech., vol. 54, no. 3, Mar. 2006
  8. Ali E. Atia, Albert E. Williams, 'Narrow-bandpass waveguide filters', IEEE Trans. Microwave Theory Tech., vol. 20, pp. 258-265, Apr. 1972 https://doi.org/10.1109/TMTT.1972.1127732
  9. J.-S. Hong, M. J. Lancaster, Microstrip Filters for RF/Microwave Applications, New York: Wiley, 2001
  10. M. Makimoto, S. Yamashita, Microwave Resonator and Filters for Wireless Communication, New York: Springer, 2000
  11. D. M. Pozar, Microwave Engineering, 3rd Ed., New York: Wiley, 2003