Journal of electromagnetic engineering and science

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

DOI QR Code

Design of Dual-Band Bandpass Filters for Cognitive Radio Application of TVWS Band

  • Kwon, Kun-An (Department of Electronic Engineering, Sogang University) ;
  • Kim, Hyun-Keun (Department of Electronic Engineering, Sogang University) ;
  • Yun, Sang-Won (Department of Electronic Engineering, Sogang University)
  • Received : 2015.08.11
  • Accepted : 2015.11.30
  • Published : 2016.01.31
Download PDF
⟨ Previous Next ⟩

Abstract

This paper presents a novel design for dual-band bandpass filters. The proposed filters are applicable to the carrier aggregation of the TV white space (TVWS) band and long-term evolution (LTE) band for cognitive radio applications. The lower passband is the TVWS band (470-698 MHz) whose fractional bandwidth is 40 %, while the higher passband is the LTE band (824-894 MHz) with 8 % fractional bandwidth. Since the two passbands are located very close to each other, a transmission zero is inserted to enhance the rejection level between the two passbands. The TVWS band filter is designed using magnetic coupling to obtain a wide bandwidth, and the LTE band filter is designed using dielectric resonators to achieve good insertion loss characteristics. In addition, in the proposed design, a transmission zero is placed with cross-coupling. The proposed dual-band bandpass filter is designed as a two-port filter (one input/one output) as well as a three-port filter (one common input/two outputs). The measured performances show good agreement with the simulated performances.

Keywords

References

  1. W. Wand and X. Lin, "A dual-band bandpass filter using open-loop resonator," in Proceedings of 2012 5th Global Symposium on Millimeter Waves (GSMM), Harbin, China, 2012, pp. 575-578.
  2. Y. H. Cho, H. I. Baek, H. S. Lee, and S. W. Yun, "A dual-band combline bandpass filter loaded by lumped series resonators," IEEE Microwave and Wireless Components Letters, vol. 19, no. 10, pp. 626-628, Oct. 2009. https://doi.org/10.1109/LMWC.2009.2029737
  3. Y. H. Cho, X. G. Wang, and S. W. Yun "Design of dual-band interdigital bandpass filters using both series and shunt resonators," IEEE Microwave and Wireless Components Letters, vol. 22, no. 3, pp. 111-113, Mar. 2012. https://doi.org/10.1109/LMWC.2012.2185839
  4. H. Joshi and W. J. Chappell, "Dual-band lumped-element bandpass filter," IEEE Transactions on Microwave Theory and Techniques, vol. 54, no. 12, pp. 4169-4177, Dec. 2006. https://doi.org/10.1109/TMTT.2006.885576
  5. J. Xu, W. Wu, and C. Miao, "Compact microstrip dual-/tri-/quad-band bandpass filter using open stubs loaded shorted stepped-impedance resonator," IEEE Transactions on Microwave Theory and Techniques, vol. 61, no. 9, pp. 3187-3198, Sep. 2013 https://doi.org/10.1109/TMTT.2013.2273759
  6. Z. Ma and Y. Kobayashi, "Design and realization of band-pass filters using composite resonators to obtain transmission zeros," in Proceedings of 2005 European Microwave conference (EuMC), Paris, 2005.
  7. G. L. Matthaei, L. Young, and E. M. T. Jones, Microwave Filters, Impedance-Matching Networks, and Coupling Structures. Norwood, MA:Artech House, 1980.
  8. R. J. Wenzel, "Understanding transmission zero movement in cross-coupled filters," in Proceedings of IEEE MITT-S International Microwave Symposium Digest, Philadelphia, PA, 2003, pp. 1459-1462.
  9. R. J. Cameron, "General coupling matrix synthesis methods for Chebyshev filtering functions," IEEE Transactions on Microwave Theory and Techniques, vol. 47, no. 4, pp. 433-442, Apr. 1999. https://doi.org/10.1109/22.754877
  10. D. M. Pozar, Microwave Engineering, New York, NY:Wiley, 1998.
  11. J. R. Smith, Modern Communication Circuits, 2nd ed., Boston, MA:McGraw-Hill, 1998, pp. 103-116.
  12. K. Chang, Handbook of Microwave and Optical Components (Volume 1: Microwave Passive and Antenna Components). New York, Wiley, 1991, 219-233.

Cited by

  1. Frequency-Switchable Microfluidic CSRR-Loaded QMSIW Band-Pass Filter Using a Liquid Metal Alloy vol.17, pp.4, 2017, https://doi.org/10.3390/s17040699
  2. Dual-Band Band-Pass Filter with Fixed Low Band and Fluidically-Tunable High Band vol.17, pp.8, 2017, https://doi.org/10.3390/s17081884
  3. Design of a Dual-Band Bandpass Filter Using an Open-Loop Resonator vol.17, pp.4, 2017, https://doi.org/10.26866/jees.2017.17.4.197
  4. Microfluidically Frequency-Reconfigurable Quasi-Yagi Dipole Antenna vol.18, pp.9, 2018, https://doi.org/10.3390/s18092935