ETRI Journal

  • 제33권6호
  • /
  • Pages.985-988
  • /
  • 2011
  • /
  • 1225-6463(pISSN)
  • /
  • 2233-7326(eISSN)
한국전자통신연구원 (Electronics and Telecommunications Research Institute)
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Dual-Transmission-Line Microstrip Equiripple Lowpass Filter with Sharp Roll-Off

  • Velidi, Vamsi Krishna (Department of Electronics & Electrical Communication Engineering, Indian Institute of Technology Kharagpur) ;
  • Sanyal, Subrata (Department of Electronics & Electrical Communication Engineering, Indian Institute of Technology Kharagpur)
  • 투고 : 2010.12.27
  • 심사 : 2011.03.15
  • 발행 : 2011.12.31
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초록

A novel application of a dual-transmission line is proposed to design a lowpass filter (LPF). The proposed structure uses only transmission line elements to produce an equiripple LPF response with sharp roll-off. Design equations are derived using a lossless transmission line model. Controlling the electrical lengths, three transmission-zeros are realized in the stopband to obtain a sharp roll-off rate and wide stopband bandwidth. A single unit microstrip LPF with a 3-dB cut-off frequency at 1.0 GHz having a roll-off of 135 dB/GHz along with a stopband bandwidth of 69.5% is designed for validation.

키워드

참고문헌

  1. D.M. Pozar, Microwave Engineering, 2nd ed. New York: Wiley, 1998.
  2. S. Dwari et al., "Compact Wide Stopband Lowpass Filter Using Rectangular Patch Compact Microstrip Resonant Cell and Defected Ground Structure," Microw. Optical Tech. Lett., vol. 49, no. 4, Apr. 2007, pp. 796-798.
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  7. S. Luo et al., "Stopband Expanded Lowpass Filters Using Microstrip Coupled-Line Hairpin Units," IEEE Microw. Wireless Compon. Lett., vol. 18, no. 8, Aug. 2008, pp. 506-508. https://doi.org/10.1109/LMWC.2008.2001004
  8. V.K. Velidi et al., "Micorstrip Coupled-Line Lowpass Filter with Wide Stopband for RF/Wireless Systems," ETRI J., vol. 31, no. 3, June 2009, pp. 324-326. https://doi.org/10.4218/etrij.09.0208.0414
  9. M.K. Mandal and P. Mondal, "Design of Sharp-Rejection, Compact, Wideband Bandstop Filters," IET Microw. Antennas Propag., vol. 2, no. 4, 2008, pp. 389-393. https://doi.org/10.1049/iet-map:20070212

피인용 문헌

  1. Design of compact microstrip lowpass filter with ultra-wide stopband using modified T-shaped resonator vol.7, pp.6, 2011, https://doi.org/10.1017/s175907871400124x
  2. Compact microstrip lowpass filter with very sharp roll-off and ultra-high figure-of-merit for wireless applications vol.29, pp.11, 2011, https://doi.org/10.1080/09205071.2015.1049716
  3. Design of an ultra-compact lowpass filter with ultra-sharp roll-off for UHF application vol.16, pp.17, 2019, https://doi.org/10.1587/elex.16.20190473
  4. A novel compact lowpass filter with sharp roll-off and wide stopband vol.12, pp.1, 2011, https://doi.org/10.1017/s175907871900103x