Journal of electromagnetic engineering and science

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

DOI QR Code

Tunable Bandpass Filter with Varactors Based on the CRLH-TL Metamaterial Structure

  • Kim, Beom Kyu (Department of Electronics and Radio Engineering, College of Electronics and Information, Kyung Hee University) ;
  • Lee, Bomson (Department of Electronics and Radio Engineering, College of Electronics and Information, Kyung Hee University)
  • Received : 2013.11.14
  • Accepted : 2013.12.12
  • Published : 2013.12.31
Download PDF
⟨ Previous Next ⟩

Abstract

This paper presents a tunable bandpass filter based on the varactor-loaded composite right- and left-handed transmission line (CRLH-TL). The proposed filter is composed of one CRLH-TL unit cell, which corresponds to the third-order bandpass filter. The tunable bandpass filter is designed using only lumped-elements. The use of lumped elements saves space and lowers the fabrication cost. The size of the proposed tunable bandpass filter is $17mm{\times}5mm$, neglecting the feed lines and DC lines. All of the varactors are controlled by one DC bias. The center frequency of the bandpass filter can be controlled by varying the value of the varactors. The tunable range of the center frequency is from 412.5 to 670 MHz. The insertion loss is less than 3 dB, the return loss is more than 10 dB in the passband.

Keywords

References

  1. G. V. Eleftheriades, A. K. Iyer, and P. C. Kremer, "Planar negative refractive index media using periodically LC loaded transmission lines," IEEE Transactions on Microwave Theory and Techniques, vol. 50, no. 12, pp. 2702-2172, Dec. 2002. https://doi.org/10.1109/TMTT.2002.805197
  2. C. Caloz and T. Itoh, Electromagnetic Metamaterials: Transmission Line Theory and Microwave Applications. New York, NY: John Wiley & Sons, 2006.
  3. S Lim, C. Caloz, and T. Itoh, "Metamaterial-based electronically controlled transmission-line structure as a novel leaky-wave antenna with tunable radiation angle and beamwidth," IEEE Transactions on Microwave Theory and Techniques, vol. 53, no. 1, pp. 161-173, Jan. 2005. https://doi.org/10.1109/TMTT.2004.839927
  4. C. Caloz and T. Itoh, "Transmission line approach of left-handed (LH) materials and microstrip implementation of an artificial LH transmission line," IEEE Transactions on Antennas and Propagation, vol. 52, no. 5, pp. 1159-1166, May 2004. https://doi.org/10.1109/TAP.2004.827249
  5. B. W. Kim, Y. H. Chun, and S. W. Yun, "Varactortuned active bandpass filter with low noise performance," IEEE Electronics Letters, vol. 40, no. 15, pp. 945-946, Jul. 2004. https://doi.org/10.1049/el:20045109
  6. S. R. Chandler, I. C. Hunter, and J. G. Gardiner, "Active varactor tunable bandpass filter," IEEE Microwave and Guided Wave Letters, vol. 3, no. 3, pp. 70-71, Mar. 1993. https://doi.org/10.1109/75.205668
  7. H. T. Kim, J. H. Park, Y. K. Kim, and Y. Kwon, "Lowloss and compact V-band MEMS-based analog tunable bandpass filters," IEEE Microwave and Wireless Components Letters, vol. 12, no. 11, pp. 432-434, Nov. 2002. https://doi.org/10.1109/LMWC.2002.805543
  8. Y. Liu, A. Borgioli, A. S. Nagra, and R. A. York, "Distributed MEMS transmission lines for tunable filter applications," International Journal of RF and Microwave Computer- Aided Engineering, vol. 11, no. 5, pp. 254-260, Sep. 2001. https://doi.org/10.1002/mmce.1034
  9. A. S. Mohra and O. F. Siddiqui, "Tunable bandpass filter based on capacitor-loaded metamaterial lines," IEEE Electronics Letters, vol. 45, no. 9, pp. 470-472, Apr. 2009. https://doi.org/10.1049/el.2009.2699
  10. A. L. Borja, J. Carbonell, J. D. Martinez, V. E. Boria, and D. Lippens, "A controllable bandwidth filter using varactor-loaded metamaterial-inspired transmission lines," IEEE Antennas and Wireless Propagation Letters, vol. 10, pp. 1575-1578, 2011. https://doi.org/10.1109/LAWP.2012.2183111
  11. C. Reck, R. Trommer, and L. Schmidt, "Bandpass filter with tunable bandwidth and center frequency based on varactor diodes," in Proceedings of the 6th German Microwave Conference, Darmstadt, Germany, 2011.
  12. J. Long, C. Li, W. Cui, J. Huangfu, and L. Ran, "A tunable microstrip bandpass filter with two independently adjustable transmission zeros," IEEE Microwave and Wireless Components Letters, vol. 21, no. 2, pp. 74-76, Feb. 2011. https://doi.org/10.1109/LMWC.2010.2097243

Cited by

  1. Design of a Switchplexer Based on a Microstrip Ring Resonator with Single-Switch Operation vol.16, pp.1, 2016, https://doi.org/10.5515/JKIEES.2016.16.1.29