Thin stripline bandpass filters for the centimeter band

Alexander V. Zakharov; Mykhailo Ye. Ilchenko; Ludmila S. Pinchuk

doi:10.3103/S0735272717020030

Authors

Alexander V. Zakharov Igor Sikorsky Kyiv Polytechnic Institute, Ukraine https://orcid.org/0000-0002-1222-1623
Mykhailo Ye. Ilchenko Igor Sikorsky Kyiv Polytechnic Institute, Ukraine https://orcid.org/0000-0002-3459-4949
Ludmila S. Pinchuk Igor Sikorsky Kyiv Polytechnic Institute, Ukraine https://orcid.org/0000-0002-1893-3365

DOI:

https://doi.org/10.3103/S0735272717020030

Keywords:

array-type filter, comb filter, strip-line design, stepped-impedance resonator, electromagnetic coupling factor, passband, attenuation pole

Abstract

This article considers the design of thin stripline (1 mm) bandpass filters in the centimeter band, which contain dielectrics with different relative permittivity ε_r. This includes the choice of the resonators, the dielectric material, the preliminary assessment of resonators’ unloaded quality factors and taking into account the features of the frequency response curve of the filter. It was found, that the passband width of the thin comb filters with λ/4 resonators and array-type filters with λ/2 resonators cannot exceed 6% for any values of ε_r and the length of resonators of at least 2 mm. The array-type filters with resonators of half-wave type and with alternating signs of the coupling factors between resonators were proposed. Under certain additional conditions, the attenuation poles appear in such filters, resulting in improved selectivity. The results of computer modelling of the frequency response curve of thin filters of cm band are presented. They are compared to the frequency response of other filters. The data obtained from computer modelling showed good correspondence with the experimental data.

References

MATTHAEI, G.; JONES, E.M.T.; YOUNG, L. Microwave Filters, Impedance-Matching Networks, and Coupling Structures. Artech House, 1980.

MAKIMOTO, M.; YAMASHITA, S. Microwave Resonators and Filters for Wireless Communication. Theory, Design and Application. Springer, 2001. DOI: http://doi.org/10.1007/978-3-662-04325-7.

MORGAN, D.; PAIGE, E.G.S. Surface Acoustic Wave Filters: With Applications to Electronic Communications and Signal Processing. Academic Press, 2010. ISBN: 978-0-12-372537-0.

FUKASAWA, A. Analysis and composition of a new microwave filter configuration with inhomogeneous dielectric medium. IEEE Trans. Microwave Theory Tech., v.30, n.9, p.1367-1375, 1982. DOI: http://doi.org/10.1109/TMTT.1982.1131262.

HONG, J.-S. Microstrip Filters for RF / Microwave Application, 2nd ed. N.Y.: Wiley, 2011.

ZAKHAROV, A.V.; ROZENKO, S.A.; ZAKHAROVA, N.A. Microstrip bandpass filters on substrates with high permittivities. J. Commun. Technol. Electron., v.57, n.3, p.342-351, 2012. DOI: http://dx.doi.org/10.1134/S1064226912020143.

ZAKHAROV, A.V.; ILCHENKO, M.Y. A new approach to designing varicap-tuned filters. J. Commun. Technol. Electron., v.55, n.12, p.1424-1431, 2010. DOI: http://doi.org/10.1134/S1064226910120156.

http://www.nxp.com.

http://www.murata.com.

FELDSTEIN, A.L. (ed.). Reference about Elements of Stripline Engineering [in Russian]. Moscow: Svyaz’, 1979).

ZAKHAROV, A.V.; ILCHENKO, M.Y.; PINCHUK, L.S. Coupling coefficient of quarter-wave resonators as a function of parameters of comb stripline filters. Radioelectron. Commun. Syst., v.58, n.6, p.284-289, 2015. DOI: http://dx.doi.org/10.3103/S0735272715060060.

ZAKHAROV, A.V.; ILCHENKO, M.E. Pseudocombline bandpass filters based on half-wave resonators manufactured from sections of balanced striplines. J. Commun. Technol. Electron., v.60, n.7, p.801-807, 2015. DOI: http://doi.org/10.1134/S1064226915060182.

WOLMAN, V.I. (ed.). Calculation and Design of Microwave Stripline Devices Reference [in Russian]. Moscow: Radio i Svyaz’, 1982.

https://www.rogerscorp.com.

ZAKHAROV, A.V.; ILCHENKO, M.Y.; KARNAUH, V.Y.; PINCHUK, L.S. Stripline bandpass filters with step-impedance resonators. Radioelectron. Commun. Syst., v.54, n.3, p.163-169, 2011. DOI: http://dx.doi.org/10.3103/S0735272711030071.

ZAKHAROV, A.V. Stripline combline filters on substrates designed on high-permittivity ceramic materials. J. Commun. Technol. Electron., v.58, n.3, p.265-272, 2013. DOI: http://doi.org/10.1134/S1064226913030145.

MEGLA, GERHARD. Dezimeterwellentechnik. Theorie und Technik der Dezimeterschaltungen [in German]. Leipzig Fachbuchverl., 1955.

CHEN, Y.-M.; CHANG, S.-F.; CHANG, C.-C.; HONG, T.-J.; LO, W.-C. A compact step-impedance combline filter with symmetric insertion-loss response and wide stopband range. In: Proc. of IEEE MTT-S Int. Microwave Symp. Dig., 11-16 Jun. 2006, San Francisco, CA. IEEE, 2006, p.1209-1212. DOI: http://doi.org/10.1109/MWSYM.2006.249427.

ZAKHAROV, A.V.; ILCHENKO, M.Y.; PINCHUK, L.S. Coupling coefficients of step-impedance resonators in stripeline band-pass filters of array type. Radioelectron. Commun. Syst., v.57, n.5, p.217-223, 2014. DOI: http://dx.doi.org/10.3103/S0735272714050045.

HONG, J.-S.; LANCASTER, M.J. Design of highly selective microstrip bandpass filters with a single pair of attenuation poles at finite frequencies. IEEE Trans. Microwave Theory Tech., v.48, n.7, p.1098-1107, 2000. DOI: http://doi.org/10.1109/22.848492.

http://www.ctscorp.com.