DOI QR코드

DOI QR Code

A Compact LTCC Dual-Band WLAN Filter using Two Notch Resonators

  • Park, Jun-Hwan (Dept. of Electrical and Electronic Engineering, Kwangwoon University) ;
  • Cheon, Seong-Jong (Dept. of Research & Division, Amkor technologies, Ltd.) ;
  • Park, Jae-Yeong (Dept. of Electrical and Electronic Engineering, Kwangwoon University)
  • Received : 2012.03.02
  • Accepted : 2012.07.02
  • Published : 2013.01.02

Abstract

This paper presents compact dual-band WLAN filter and filter module. They were developed by embedding all of the passive lumped elements into a LTCC substrate. In order to reduce the size/volume of the filter and avoid EM parasitic couplings between the passive elements, the proposed filter was designed using a 3rd order Chebyshev circuit topology and J-inverter transformation technology. The 3rd order Chebyshev bandpass filter was firstly designed for the band-selection of the 802.11b and was then transformed using finite transmission zeros technologies. Finally, the dual-band filter was realized by adding two notch resonators to the 802.11b filter circuit for the band-selection of the 802.11a/g. The maximum insertion losses in the lower and higher passbands were better than 2.0 and 1.3 dB with minimum return losses of 15 and 14 dB, respectively. Furthermore, the filter was integrated with a diplexer to clearly split the signals between 2 and 5 GHz. The maximum insertion and minimum return losses of the fabricated module were 2.2 and 14 dB at 2.4 - 2.5 GHz, and 1.6 and 19 dB at 5.15 - 5.85 GHz, respectively. The overall volume of the fabricated filter was $2.7{\times}2.3{\times}0.59mm^3$.

Keywords

References

  1. J.T. Juo, T.H. Yeh, and C.C. Yeh, "Design of Microstrip Bandpass Filters With a Dual-Passband Response," IEEE Trans. Microwave Theory and Techniques, Vol. 53, No. 4, pp. 1331-1337, Apr. 2005. https://doi.org/10.1109/TMTT.2005.845765
  2. M.H. Weng, H.W. Wu, and Y.K. Su, "Compact and Low Loss Dual-Band Bandpass Filter Using Pseudo- Interdigital Stepped Impedance Resonators for WLANs," IEEE Microwave and Wireless Components Letters, Vol. 17, No. 3, pp. 187-189, Mar. 2007. https://doi.org/10.1109/LMWC.2006.890463
  3. G.A. Lee, Mohamed A. Megahed, and Franco De Flaviis, "Low-Cost Compact Spiral Inductor Resonator Filters for System-In-a-Package," IEEE Trans. Advanced Packaging, Vol. 28, No. 4, pp. 761-771, Nov. 2005. https://doi.org/10.1109/TADVP.2005.850504
  4. C. W. Tang, S. F. You, and I. C. Liu, "Design of a Dual-Band Bandpass Filter With Low-Temperature Co-Fired Ceramic Technology," IEEE Trans. Microwave Theory and Techniques, Vol. 54, No. 8, pp. 3327-3332, Aug. 2006. https://doi.org/10.1109/TMTT.2006.879174
  5. E. E. Djoumessi and K. Wu, "Multilayer Dual-Mode Dual-Bandpass Filter," IEEE Microwave Wireless Components Letter, Vol. 19, No. 1, pp. 21-23, 2009. https://doi.org/10.1109/LMWC.2008.2008552
  6. Miyake. H., Kitazawa, S. Ishizaki, T. Yamada, T. and Nagatomi, Y. "A miniaturized monolithic dual band filter using ceramic lamination technique for dual mode portable telephones," IEEE MTT-S International Microwave Symposium Digest, Vol. 2, pp. 789-792, 1997.
  7. C. W. Tang and S. F. You, "Using the technology of low temperature co-fired ceramic to design the dualband bandpass filter," IEEE Microwave Wireless Components. Letter, Vol. 16, No. 7, pp. 407-409, 2006. https://doi.org/10.1109/LMWC.2006.877123
  8. Y. X. Guo, L.C. Ong, M.Y.W. Chia and B. Luo, "Dual-Band Bandpass Filter in LTCC," IEEE MTT-S International Microwave Symposium Digest, pp. 2219-2222, Jun. 2005.
  9. A. Bavisi, M. Swaminathan and E. Mina, "Liquid Crystal Polymer-Based Planar Lumped Component Dual-Band Filters For Dual-Band WLAN Systems," IEEE Radio and Wireless Symposium, pp. 539-542, 2007.
  10. L. C. Tsai and C. W. Hsue, "Dual-band bandpass filters using equal-length coupled-serial-shunted lines and Z-transform technique," IEEE Trans. Microwave Theory and Techniques, Vol. 52, No. 4, pp. 1111-1117, 2004. https://doi.org/10.1109/TMTT.2004.825680
  11. S. Lee and Y. Lee, "A planar dual-band filter based on reduced length parallel coupled lines," IEEE Microwave Wireless Components Letter, Vol. 20, No. 1, pp. 16-18, Jan. 2010. https://doi.org/10.1109/LMWC.2009.2035953
  12. P.Mondal and M. K. Mandal "Design of Dual-Band Bandpass Filters Using Stub-Loaded Open-Loop Resonators," IEEE Trans. Microwave Theory and Techniques, Vol. 56, No.1, pp. 150-155, Jan. 2008. https://doi.org/10.1109/TMTT.2007.912204
  13. L. S. Wu, J. F. Mao, W. Y. Yin and Y. X. Guo, "A dual-band filter using stepped-impedance resonator (SIR) embedded into substrate integrated waveguide (SIW)," IEEE EDAPS., pp. 1-4, 2010.
  14. D. Puttadilok, D. Eungdamrong, and S. Amornsaensak, "A microstrip diplexer filter using stepped-impedance resonators," SICE Annual Conference 2008, pp. 59- 62, Aug. 2008.
  15. C. F. Chen, T. Y. Huang, C. P. Chou, and R. B. Wu, "Microstrip diplexers design with common resonator sections for compact size but high isolation," IEEE Trans. Microwave Theory and Techniques, Vol. 54, No. 5, pp. 1945-1952, May 2006. https://doi.org/10.1109/TMTT.2006.873613
  16. J.S. Hong and M.J. Lancaster, Microstrip filters for RF/Microwave applications. New York: John Wiley Sons, Inc.
  17. Jayaseelan, M. and Mazlina E. "Equivalent J-Inverter Network Parameters Analysis and Cancellation of Spurious Response of Parallel Coupled Microstrip Line," Proc. of the RFM conference, pp. 247-252, 2006.
  18. J. S. Lim and D. C. Park, "A modified Chebyshev bandpass filter with attenuation poles in the stopband," IEEE Trans. Microwave Theory and Techniques, Vol. 45, pp. 898-904, Jun. 1997. https://doi.org/10.1109/22.588597
  19. Martin Fritz and Werner Wiesbeck, "A Diplexer Based on Transmission Lines, Implemented in LTCC," IEEE Trans. Advanced Packaging, Vol. 29, No. 3, pp. 427-432, Aug. 2006. https://doi.org/10.1109/TADVP.2006.872997
  20. Albert Sutono, Anh-Vu H. Pham, Joy Laskar, and William R. Smith, "RF/Microwave Characterization of Multilayer Ceramic-Based MCM Technology," IEEE Trans. Advanced Packaging, Vol. 22, No. 3, pp. 326-331, Aug. 1999.

Cited by

  1. Fractional-order LβCαLow-Pass Filter Circuit vol.10, pp.4, 2015, https://doi.org/10.5370/JEET.2015.10.4.1597