The Journal of Korean Institute of Electromagnetic Engineering and Science (한국전자파학회논문지)

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

DOI QR Code

Stepped Impedance LPF Using MCS Line with Ground

접지가 있는 MCS 선로를 이용한 스텝 임피던스 저역 필터

  • Rhee, Seung-Yeop (Dept. of Electronic Communication Engineering, Chonnam University) ;
  • Lee, Yong-Kook (Dept. of Computer Information Processing, Shingu College)
  • 이승엽 (전남대학교 전자통신공학과) ;
  • 이용국 (신구대학 컴퓨터정보처리과)
  • Published : 2008.11.30
Download PDF
⟨ Previous Next ⟩

Abstract

The MCS(Micro-Coplanar Strip) line with ground has been analyzed. The conformal mapping method is used to calculate the quasi-static effective dielectric constant and characteristic impedance of this MCS line. The computed results of the present work are found to be in good agreement when compared with the results obtained using commercial S/W, IE3D. And in this paper, the stepped-impedance low pass filter is designed and fabricated with MCS lines for improving the frequency responses. The LPF proposed structure has been also designed and implemented to have the sharp attenuation characteristics in stop band. The agreement between simulation and measurement results verify the implemented LPF.

본 논문은 접지가 있는 비대칭 CPW(Coplanar Waveguide) 선로를 conformal mapping 방법을 사용하여 해석하였다. 이 방법으로 선로의 준정전계 특성 파라미터인 특성 임피던스와 유효 유전율을 계산하였다. 계산된 결과는 상용 프로그램인 IE3D의 결과와 기존 실험값과 비교했으며, 거의 일치함을 보였다. 그리고 본 논문에 해석한 접지가 있는 비대칭 CPW(MCS: Micro Coplanr Strip) 선로를 이용하여 스텝 임피던스 저역 필터에 적용하였다. 제작된 스텝 임피던스 저역 필터는 일반 마이크로스트립 선로로 구현된 저역 필터 특성과 비교하였다. 제작된 필터의 실험 결과를 모의실험과 비교하여 잘 일치함을 확인하였다.

Keywords

References

  1. J. Won No, H. Yong Hwang, "A design of cascades CPW low-pass filter with broad stopband", IEEE Microwave and Wireless Componets Lett., vol. 17, no. 61, pp. 427-429, Jun. 2007 https://doi.org/10.1109/LMWC.2007.897790
  2. Kee Woon Tan, Uysal, "Analysis and design of conductor-backed asymmetric coplanar waveguide lines using conformal mapping techniquess and their application to end-coupled filters", IEICE Trans. Electron., vol. E82-C, no. 7, pp. 1098-1103, Jul. 1999
  3. Y. Qian, E. Yamashita, "Additional approximate formulars and experimental data on micro-coplanar striplines", IEEE Trsans. Microwave Theory Tech., vol. 38, no. 4, pp. 443-445, Apr. 1990 https://doi.org/10.1109/22.52590
  4. G. Ghino, C. U. Naldi, "Coplanar waveguide for MMIC application: Effect of upper shielding, conductor backing, finite-extent ground planes, and line-to-line coupling", IEEE Trsans. Microwave Theory Tech., vol. 35, no. 3, pp. 260-267, Mar. 1987 https://doi.org/10.1109/TMTT.1987.1133637
  5. R. E. Collin, Foundation for Microwave Engineering, 2nd, McGraw Hill Inc., 1992
  6. IE3D manual, Zealand software
  7. David M. Pozar, Microwave Engineering, Addison- Wesley, Massachusetts, 1990
  8. J. Hong, M. J. Lancaster, Microstrip Filters for RF/ Microwave Applications, John Wiley & Son, Inc., 2001