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Radioelectronics and Communications Systems

, Volume 60, Issue 9, pp 383–392 | Cite as

Varicap-tuned narrowband filters with extended rejection band based on U-shaped microstrip Resonators

  • A. V. Zakharov
  • M. Ye. Ilchenko
Article
  • 25 Downloads

Abstract

A resonance equation for the first unwanted resonant frequency of tunable microwave U-shaped loop-type resonator with variable capacitance has been derived. This frequency does not depend on the variable capacitance value; it is invariable and proportional to λ-type oscillations. The ascertained feature makes it possible to determine the ratio of the first unwanted resonant frequency to the frequency of the main resonance and control the rejection bandwidth of tunable filters with U-shaped resonators. A narrowband (2%) varicap-tuned filter with extended rejection band has been built and its experimental data are presented. The experimental four-resonator filter could be tuned in the frequency range 225–400 MHz. The filter rejection band in terms of the attenuation level of –40 dB was located in the frequency range 420–1290 MHz, i.e., f max /f min = 3.07. Varicap-tuned filters with microstrip U-shaped resonators are shown to have a good potential for their practical use.

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References

  1. 1.
    P. W. Wong and I. Hunter, “Electronically tunable filters,” IEEE Microwave Mag. 10, No. 6, 46 (2009). DOI: 10.1109/MMM.2009.933593.CrossRefGoogle Scholar
  2. 2.
    J.-S. Hong, “Reconfigurable planar filters,” IEEE Microwave Mag. 10, No. 6, 73 (2009). DOI: 10.1109/MMM.2009.933590.CrossRefGoogle Scholar
  3. 3.
    A. R. Brown, G. M. Rebeiz, “A varactor-tuned RF filter,” IEEE Trans. Microwave Theory Tech. 48, No. 7, 1157 (2000). DOI: 10.1109/22.848501.CrossRefGoogle Scholar
  4. 4.
    B. Kapilevich, “A varactor-tuned filter with constant bandwidth and loss compensation,” Microwave J., No. 4, 106 (2007). URI: http://www.microwavejournal.com/articles/4575.Google Scholar
  5. 5.
    A. V. Zakharov and M. E. Ilchenko, “A new approach to designing varicap-tuned filters,” J. Commun. Technol. Electron. 55, No. 12, 1424 (2010). DOI: 10.1134/S1064226910120156.CrossRefGoogle Scholar
  6. 6.
    J. Sigman, C. D. Nordquist, P. G. Clem, G. M. Kraus, P. S. Finnegan, “Voltage-controlled Ku-band and X-band tunable combline filters using barium-strontium-titanate,” IEEE Microwave Wireless Compon. Lett. 18, No. 9, 593 (2008). DOI: 10.1109/LMWC.2008.2002453.CrossRefGoogle Scholar
  7. 7.
    J. Nath, D. Ghosh, J.-P. Maria, A. I. Kingon, W. Fathelbab, P. D. Franzon, M. B. Steer, “An electronically tunable microstrip bandpass filter using thin-film Barium-Strontium-Titanate (BST) varactors,” IEEE Trans. Microwave Theory Tech. 53, No. 9, 2707 (2005). DOI: 10.1109/TMTT.2005.854196.CrossRefGoogle Scholar
  8. 8.
    A. V. Zakharov, M. E. Ilchenko, V. Ya. Karnaukh, and L. S. Pinchuk, “Tunable microstrip resonators with ferroelectric capacitors,” Radioelectron. Commun. Syst. 53, No. 8, 418 (2010). DOI: 10.3103/S0735272710080042.CrossRefGoogle Scholar
  9. 9.
    A. V. Zakharov, M. E. Ilchenko, V. Ya. Karnaukh, and L. S. Pinchuk, “Quality of ferroelectric capacitors used in tunable microwave filters,” J. Commun. Technol. Electron. 56, No. 8, 1020 (2011). DOI: 10.1134/S1064226911050147.CrossRefGoogle Scholar
  10. 10.
    K. Y. Chan, S. Fouladi, R. Ramer, R. R. Mansour, “RF MEMS switchable interdigital bandpass filter,” IEEE Microwave Wireless Compon. Lett. 22, No. 1, 44 (2012). DOI: 10.1109/LMWC.2011.2176926.CrossRefGoogle Scholar
  11. 11.
    X. Liu, L. P. B. Katehi, W. J. Chappell, D. Peroulis, “Power handling of electrostatic MEMS evanescent-mode (EVA) tunable bandpass filters,” IEEE Trans. Microwave Theory Tech. 60, No. 2, 270 (2012). DOI: 10.1109/TMTT.2011.2176136.CrossRefGoogle Scholar
  12. 12.
    F. Huang, S. Fouladi, R. R. Mansour, “High-Q tunable dielectric resonator filters using MEMS technology,” IEEE Trans. Microwave Theory Tech. 59, No. 12, 3401 (2011). DOI: 10.1109/TMTT.2011.2171984.CrossRefGoogle Scholar
  13. 13.
    V. Sekar, M. Armendariz, K. Entesari, “A 1.2-1.6-GHz substrate-integrated-waveguide RF MEMS tunable filter,” IEEE Trans. Microwave Theory Tech. 59, No. 4, 866 (2011). DOI: 10.1109/TMTT.2011.2109006.CrossRefGoogle Scholar
  14. 14.
    http://www.dovermpg.com/polezero.Google Scholar
  15. 15.
    M. Makimoto, S. Yamashita, Microwave Resonators and Filters for Wireless Communication (Springer, 2001). DOI: 10.1007/978-3-662-04325-7.CrossRefGoogle Scholar
  16. 16.
    J.-S. Hong, Microstrip Filters for RF/Microwave Application, 2nd ed. (Wiley, New York, 2011).CrossRefGoogle Scholar
  17. 17.
    E. A. Guillemin, Synthesis of Passive Networks (Wiley, 1957).Google Scholar
  18. 18.
    G. Matthaei, E. M. T. Jones, and L. Young, Microwave Filters, Impedance-Matching Networks, and Coupling Structures, Vol. 2 (Artech Microwave Library, 1980).Google Scholar
  19. 19.
    A. V. Zakharov, M. E. Ilchenko, and L. S. Pinchuk, “Microstrip U-shaped resonators,” Radioelectron. Commun. Syst. 55, No. 8, 368 (2012). DOI: 10.3103/S0735272712080043.CrossRefGoogle Scholar
  20. 20.
    A. V. Zakharov, “Quality of tunable transmission line resonators with capacitor,” J. Commun. Technol. Electron. 56, No. 5, 603 (2011). DOI: 10.1134/S1064226911030144.CrossRefGoogle Scholar
  21. 21.
    A. V. Zakharov and S. A. Rozenko, “Duplexer designed on the basis of microstrip filters using high dielectric constant substrates,” J. Commun. Technol. Electron. 57, No. 6, 649 (2012). DOI: 10.1134/S1064226912030187.CrossRefGoogle Scholar

Copyright information

© Allerton Press, Inc. 2017

Authors and Affiliations

  1. 1.National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute”KyivUkraine

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