Journal of electromagnetic engineering and science

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

Semi-Lumped Compact Low-Pass Filter for Harmonics Suppression

  • Li Rui (Department of Radio Sciences and Engineering, Korea Maritime University) ;
  • Kim Dong-Il (Department of Radio Sciences and Engineering, Korea Maritime University) ;
  • Choi Chang-Mook (Department of Radio Sciences and Engineering, Korea Maritime University)
  • Published : 2006.09.01
Download PDF
⟨ Previous Next ⟩

Abstract

In this paper, a new semi-lumped low-pass filter with three finite attenuation poles at stopband is presented. The new structure is composed of a pair of symmetrical parallel coupled-line and a shunted capacitor. With this configuration, three finite attenuation poles can be available for 2nd, 3rd, and 4th harmonics suppression. The research method is based on transmission-line model for tuning the attenuation poles. In order to examine the feasibility of the proposed structure, a low-pass filter based on microstrip structure with harmonics suppression is designed, fabricated, and measured. The experimental results of the fabricated circuit agree well with the simulation and analytical ones.

Keywords

References

  1. G. L. Mattaei, L. Young, and E. M. T. Jones, Microwave Filters, Impedance Matching Networks and Coupling Structure, New York: McGraw-Hill, 1980
  2. Jia-Sheng Hong, M. J. Lancaster, Microstrip Filters for RF/Microwave Applications, New York: John Wiley & Sons, 2001
  3. I. Rumsey, M. Piket-May, and P. K. Kelly, 'Photonic bandgap structure used as filters in microstrip circuits', IEEE Microw. Guided Wave Lett., vol. 8, no. 10, pp. 336-338, Oct. 1998 https://doi.org/10.1109/75.735413
  4. D. Ahn, J. S. Park, C. S. Kim, J. Kim, Y. Qian, and T. Itoh, 'A design of the low-pass filter using the novel microstrip defected ground structure', IEEE Trans. Microw. Theory Tech., vol. 49, no. 1, pp. 86-93, Jan. 2001 https://doi.org/10.1109/22.899965
  5. L-H Hsieh, K. Chang, 'Compact low-pass filter using stepped impedance hairpin resonator', Electron. Lett., vol. 37, no. 14, pp. 899-900, Jul. 2001 https://doi.org/10.1049/el:20010600
  6. L-H Hsieh, K. Chang, 'Compact elliptic-function low-pass filters using microstrip stepped-impedance hairpin resonators', IEEE Microw. Theory Tech., vol. 51, no. 1, pp. 193-199, Jan. 2003 https://doi.org/10.1109/TMTT.2002.806901
  7. David M. Pozar, Microwave Engineering, 3rd, New York: John Wiley & Sons, 2005