Tunable RX filter with ferroelectric capacitors for DCS, PCS and UMTS communication systems
DOI:
https://doi.org/10.1109/ICATT.2017.7972648Keywords:
tunable filters, ferroelectric capacitor, microstrip resonator, duplexer, duplex spacingAbstract
A new structure of a bandpass filter with steep left slope of the frequency response, tunable by ferroelectric capacitors, is proposed. The filter can be used in receiving channel (RX) in communication systems of DCS, PCS and UMTS standards. The computer simulation of the frequency responses of the filter has been performed for the following conditions: feasible parameters of ferroelectric capacitors; small capacitance range Cmin/Cmax < 2; relatively large minimum capacitance Cmin > 0.4 pF; low quality factor Qc.References
A. Goel, B. Analui, and H. Hashemi, “Tunable duplexer with passive feed-forward cancellation to improve the rx-tx isolation,” IEEE Trans. Circuits Systems I, Vol. 62, No. 2, pp. 536-544, 2015. DOI: http://doi.org/10.1109/TCSI.2014.2360759.
T. O'Sullivan, R. A. York, B. Noren, and P. M. Asbeck, “Adaptive duplexer implemented using single-pathand multipath feedforward techniques with BST phase shifters,” IEEE Trans. Microwave Theory Tech., vol. 53, no. 1, pp. 106-114, Jan. 2005. DOI: http://doi.org/10.1109/TMTT.2004.839900.
P. W. Wong and I. Hunter, “Electronically tunable filters,” IEEE Microwave Mag., Vol. 10, No. 6, pp. 46-54, Oct. 2009. DOI: http://doi.org/10.1109/MMM.2009.933593.
G. M. Rebeiz, K. Entesari, I. C. Reines, S.-J. Park, M. A. El-tanani, A. Grichener, and A. R. Brown, “Tuning in to RF MEMS,” IEEE Microwave Mag., vol. 10, no. 6, pp. 55-72, Oct. 2009. DOI: http://doi.org/10.1109/MMM.2009.933592.
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., Vol. 18, No. 9, pp. 593-595, 2008, DOI: http://doi.org/10.1109/LMWC.2008.2002453.
I. Vendik, O. Vendik, V. Pleskachev, M. Nikol’ski, “Tunable filters based on ferroelectrics,” Integrated Ferroelectrics, Vol. 49, p. 83-92, 2002. DOI: http://doi.org/10.1080/10584580215469.
A. V. Zakharov, M. E. Il’chenko, V. Ya. Karnaukh, and L. S. Pinchuk, “Quality of ferroelectric capacitors used in tunable microwave filters,” J. Commun. Technol. Electron., Vol. 56, No. 8, pp. 1020-1025, 2011. DOI: http://doi.org/10.1134/S1064226911050147.
A. V. Zakharov, M. Ye. Ilchenko, V. Ya. Karnaukh, and L. S. Pinchuk, “Tunable microstrip resonators with ferroelectric capacitors,” Radioelectron. Commun. Syst., Vol. 53, No. 8, pp. 418-423, 2010. DOI: http://doi.org/10.3103/S0735272710080042.
J. Nath, D. Ghosh, J.-P. Maria, A. I. Kingon, W. Fathelbab, P. D. Franson, M. B. Steer, “An electronically tunable microstrip bandpass filter using thin-film Barium-Strontium-Titanate (BST) varactors,” IEEE Trans. Microwave Theory Tech., Vol. 53, No. 9, pp. 2707-2712, Sept. 2005. DOI: http://doi.org/10.1109/TMTT.2005.854196.
R. M. Kurzrok, “General three-resonator filters in wavegade,” IEEE Trans. Microwave Theory Tech., vol. 14, no. 1, pp. 46-47, Jan. 1966. DOI: http://doi.org/10.1109/TMTT.1966.1126154.
G. L. Matthaei, L. Young, and E. M. T. Jones, Microwave Filters, Impedance-Matching Networks and Coupling Structures. New York: McGraw-Hill, 1964.
A. V. Zakharov, M. E. Il’chenko, V. N. Korpach, “Features of coupling coefficiens of planar stepped-impedance resonators at higher resonance frequencies and application of such resonators for suppression of spurious passbands,” J. Commun. Technol. Electron., Vol. 59, No. 6, pp. 550-556, 2014. DOI: http://doi.org/10.1134/S1064226914060217.
A. V. Zakharov, M. Ye. Ilchenko, V. Ya. Karnaukh, and L. S. Pinchuk, “Stripline bandpass filters with step-impedance resonators,” Radioelectron. Commun. Syst., Vol. 54, No. 3, pp. 163-169, 2011. DOI: http://doi.org/10.3103/S0735272711030071.
A. V. Zakharov, M. Ye. Ilchenko, L. S. Pinchuk, “Coupling coefficient of stepped-impedance resonators in stripline bandpass filters of array type,” Radioelectron. Commun. Syst., Vol. 57, No. 5, pp. 217-223, 2014. DOI: http://doi.org/10.3103/S0735272714050045.
M. Makimoto and S. Yamashita. Microwave Resonators and Filters for Wireless Communication. Springer, 2000.
