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

Lower Characteristic Impedance Based Compact f λ0/4 Short-Circuited Stub UWB Bandpass Filter with WLAN Stopband

저특성 임피던스의 λ0/4 단락 스터브 기술을 이용한 WLAN 저지 대역을 가지는 UWB BPF

  • Hoa, Duong Thai (Department of Radio Science & Engineering, KyungHee University) ;
  • Joo, Hyo-Suk (Department of Radio Science & Engineering, KyungHee University) ;
  • Kim, Ihn-Seok (Department of Radio Science & Engineering, KyungHee University)
  • Published : 2009.04.30
Download PDF
⟨ Previous Next ⟩

Abstract

In this paper, we introduce a modified short-circuited stub bandpass filter suitable for ultra-wideband(UWB) applications utilizing low temperature co-fired ceramic(LTCC) technology. By modifying the conventional short-circuited stub bandpass filter structure with stubs and connecting lines of lower characteristic impedances, the number of stubs has been reduced from 5 to 2 on a high dielectric constant substrate($\varepsilon_r$ = 40). A wireless local area network (WLAN) stopband in the frequency range of 5.15 to 5.825 GHz has been inserted into the filter characteristic using three short-circuited coupled lines. The filter has been measured with an insertion loss less than 1.0 dB and return loss better than 10 dB in the pass bands. A bandwidth ratio of 109.49 % has been achieved. Measurement results agree well with simulation results. The dimensions of the filter are $4{\times}8{\times}0.57\;mm^3$.

본 논문에서는 기존의 $\lambda_0$/4 단락 스터브 대역 통과 필터의 특성을 개선하여 LTCC(Low Temperature Co-fired Ceramic)을 이용하여 UWB(Ultra Wideband) 응용에 적합한 필터 기술을 소개한다. 높은 유전 상수의 기판($\varepsilon_r$ = 40)상에 기존의$\lambda_0$/4의 단락 스터브 대역 통과 필터 기술을 적용하기 위하여 기존의 필터와는 다르게 낮은 특성 임피던스 선로를 이용하여 결과적으로 스터브의 수를 다섯 개에서 두 개로 감소시켰다. 또한, 3개의 단락 결합 선로를 이용해서 5.15 GHz에서 5.825 GHz의 주파수 범위에서 WLAN(Wireless Local Area Network) 저지 대역을 특성 내에 삽입하였다. 본 필터는 통과 대역에서 1 dB 미만의 삽입 손실과 10 dB 이상의 반사 손실을 갖는 것으로 측정되었고, 109.49 %의 대역폭 율이 달성되었다. 측정 결과는 시뮬레이션 결과와 잘 일치한다. 필터의 크기는 $4{\times}8{\times}0.57\;mm^3$이다.

Keywords

References

  1. FCC, "Revision of Part 15 of the commission's rules regarding ultra-wide-band transmission system", Tech. Rep., ET-Docket 98-153, Feb. 2002
  2. A. Saito, H. Harada, and A. Nishikata, "Development of bandpass filter for Ultra Wideband(UWB) communication systems", Proc. IEEE Conf. UltraWideband Syst. Technol., pp. 76-80, Nov. 2003 https://doi.org/10.1109/UWBST.2003.1267806
  3. H. Ishida, K. Araki, "Design and analysis of UWB bandpass filter with ring filter", IEEE MTT-S Int. Dig., pp. 1307-1310, Jun. 2004 https://doi.org/10.1109/MWSYM.2004.1338806
  4. C. L. Hsu, F. C. Hsu, and J. T. Kuo, "Microstrip bandpass filter for Ultra-Wideband(UWB) wireless communications", IEEE MTT-S Int. Dig., pp. 679- 682, Jun. 2005
  5. C. W. Tang, C. C. Tseng, H. H Liang, and S. F. You, "Development of ultra-wideband LTCC filter", IEEE ICU, pp. 5-8, Sep. 2005 https://doi.org/10.1109/ICU.2005.1570006
  6. L. Zhu, S. Sun, and W. Menzel, "Ultra-wideband (UWB) bandpass filters using multiple mode resonator", IEEE Microw. Wireless Compon. Lett., vol. 15, no. 11, pp. 796-798, Nov. 2005 https://doi.org/10.1109/LMWC.2005.859011
  7. H. Wang, L. Zhu, and W. Menzel, "Ultra-wide band bandpass filter with hybrid microstrip/CPW structure", IEEE Microw. Wireless Compon. Lett., vol. 15, no. 12, pp. 844-846, Dec. 2005 https://doi.org/10.1109/LMWC.2005.860016
  8. J. Gao, L. Zhu, W. Menzel, and F. Bogelsack, "Short-circuited cpw multiple-mode resonator for Ultra- Wideband(UWB) bandpass filter", IEEE Microw. Wireless Compon. Lett., vol. 16, no. 3, pp. 104-106, Mar. 2006 https://doi.org/10.1109/LMWC.2006.869870
  9. R. Li, L. Zhu, "Compact UWB bandpass filter using stub-loaded multiple-mode resonator", IEEE Microw. Wireless Compon. Lett., vol. 17, no. 1, pp. 40-42, Jan. 2007 https://doi.org/10.1109/LMWC.2006.887251
  10. S. W. Wong, L. Zhu, "EBG-embedded multiple- mode resonator for UWB bandpass filter with improved upper-stopband performance", IEEE Microw. Wireless Compon. Lett., vol. 17, no. 6, pp. 421-423, Jun. 2007 https://doi.org/10.1109/LMWC.2007.897788
  11. J. A. Ruiz-Cruz, Y. Zhang, K. A. Zaki, A. J. Piloto, and J. Tallo, "Ultra-wideband LTCC ridge waveguide filters", IEEE Microw. Wireless Compon. Lett., vol. 17, no. 2, pp. 115-117, Feb. 2007 https://doi.org/10.1109/LMWC.2006.890333
  12. P. K. Singh, S. Basu, and Y. H. Wang, "Planar ultra-wideband bandpass filter using edge coupled microstrip lines and stepped impedance open stub", IEEE Microw. Wireless Compon. Lett., vol. 17, no. 9, pp. 649-651, Sep. 2007 https://doi.org/10.1109/LMWC.2007.903440
  13. P. Mondal, M. K. Mandal, and A. Chakrabarty, "Compact ultra-wideband bandpass filter with improved upper stopband", IEEE Microw. Wireless Compon. Lett., vol. 17, no. 9, pp. 643-645, Sep. 2007 https://doi.org/10.1109/LMWC.2007.903437
  14. G. L. Matthaei, "Design of wide-band (and narrow- band) band-pass microwave filters on the insertion loss basis", IRE Trans. MTT, pp. 580-593, Nov. 1960 https://doi.org/10.1109/TMTT.1960.1124801
  15. G. L. Matthaei, L. Young, and E. M. T. Jones, Microwave Filters Impedance-matching Networks and Coupling Structures, Norwood, MA: Artech House, 1980
  16. J. S. Hong, H. Shaman, "An optimum ultra-wideband microstrip filter", Microw. Opt. Technol., vol. 47, no. 3, pp. 230-233, Nov. 2005 https://doi.org/10.1002/mop.21133
  17. M. Makimoto, S. Yamashita, "Compact bandpass filters using stepped impedance resonators", Proc. IEEE., vol. 67, no. 1, pp. 16-19, Jan. 1979 https://doi.org/10.1109/PROC.1979.11196
  18. L. A. Robinson, "Wideband interdigital filters with capacitively loaded resonators", G-MTT Symp. Dig., vol. 65, pp. 33-38, May 1965 https://doi.org/10.1109/GMTT.1965.1122470
  19. Y. Zhang, K. A. Zaki, "Miniature broadband bandpass filters using double-layer coupled stripline resonators", IEEE Trans. Microwave Theory & Tech., vol. 54, no. 8, pp. 3370-3377, Aug. 2006 https://doi.org/10.1109/TMTT.2006.879176
  20. W. H. Tu, K. Chang, "Compact second harmonic- suppressed bandstop and bandpass filter using open stubs", IEEE Trans. Microwave Theory & Tech., vol. 54, no. 6, pp. 2497-2520, Jun. 2006 https://doi.org/10.1109/TMTT.2006.875802
  21. K. Rambabu, M. Y. W. Chia, K. M. Chan, and J. Bornemann, "Design of multiple-stopband filters for interference suppression in UWB applications", IEEE Trans. Microwave Theory & Tech., vol. 54, no. 8, pp. 3333-3338, Aug. 2006 https://doi.org/10.1109/TMTT.2006.877813