ETRI Journal

  • 제31권3호
  • /
  • Pages.324-326
  • /
  • 2009
  • /
  • 1225-6463(pISSN)
  • /
  • 2233-7326(eISSN)
한국전자통신연구원 (Electronics and Telecommunications Research Institute)
권호 표지

Microstrip Coupled-Line Lowpass Filter with Wide Stopband for RF/Wireless Systems

  • Velidi, Vamsi Krishna (Department of Electronics & Electrical Communication Engineering, Indian Institute of Technology) ;
  • Mandal, Mrinal Kanti (Department of RF and Optical, Institute for Infocomm Research) ;
  • Sanyal, Subrata (Department of Electronics & Electrical Communication Engineering, Indian Institute of Technology)
  • 투고 : 2008.12.17
  • 심사 : 2009.02.18
  • 발행 : 2009.06.30
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초록

We present the design of a compact microstrip lowpass filter with a wide stopband which is up to ten times the cutoff frequency. The filter is based on a coupled-line configuration and shunt open stubs. The open stubs create additional transmission zeros, which are used to extend the stopband of the filter without any additional components or cascaded units. A prototype lowpass filter with a 3 dB cutoff frequency of 0.428 GHz and a 15 dB stopband extended up to 4.77 GHz is fabricated to validate the theoretical predictions.

키워드

참고문헌

  1. D. Ahn et al., “A Design of the Low-Pass Filter Using the Novel Microstrip Defected Ground Structure,” IEEE Trans. Microwave Theory Tech., vol. 49, Jan. 2001, pp. 86-93. https://doi.org/10.1109/22.899965
  2. M.K. Mandal and S. Sanyal, “A Novel Defected Ground Structure for Planar Circuits,” IEEE Microwave and Wireless Comp. Lett., vol. 16, Feb. 2006, pp. 93-95. https://doi.org/10.1109/LMWC.2005.863192
  3. S. Dwari and S. Sanyal, “Compact Sharp Cutoff Wide Stopband Lowpass Filter Using Complementary Split Ring Resonator,” Microwave and Optical Tech. Lett., vol. 49, no. 11, Nov. 2007, pp. 2865-2897. https://doi.org/10.1002/mop.22825
  4. S. Luo, L. Zhu, and S. Sun, “Stopband Expanded Lowpass Filters Using Microstrip Coupled-Line Hairpin Units,” IEEE Microwave and Wireless Comp. Lett., vol. 18, no. 8, Aug. 2008, pp. 506-508. https://doi.org/10.1109/LMWC.2008.2001004
  5. L-H. Hsieh and K. Chang, “Compact Elliptic Function Lowpass Filters Using Microstrip Stepped Impedance Hairpin Resonators,” IEEE Trans. Microwave Theory Tech., vol. 51, no. 1, Jan. 2003, pp. 193-199. https://doi.org/10.1109/TMTT.2002.806901
  6. M.K. Mandal, V.K. Velidi, and S. Sanyal, “Design of Ultra-Wideband Bandstop Filter with Three Transmission Zeros,” Microwave and Optical Tech. Lett., vol. 50, no. 11, Nov. 2008, pp. 2955-2957. https://doi.org/10.1002/mop.23819
  7. M.K. Mandal, K. Divyabramham, and S. Sanyal, “Compact, Wideband Bandstop Filters with Sharp Rejection Characteristics,” IEEE Microwave and Wireless Comp. Lett. vol. 18, no. 10, Oct. 2008, pp. 665-667. https://doi.org/10.1109/LMWC.2008.2003454