Coupling coefficients of step-impedance resonators in stripeline band-pass filters of array type

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

doi:10.3103/S0735272714050045

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/S0735272714050045

Keywords:

coupling coefficient, resonant frequency, step-impedance resonator, stripline filter, suppressed frequency band

Abstract

There are researched specificities of electromagnetic coupling coefficients at main and higher resonance frequencies between step-impedance resonators, fabricated from symmetric stripe transmission lines with open ends. It is shown, modification of step resonators parameters can result in modification of the coupling coefficient at main resonance frequency in wide range, that allows to realize band-pass filters of array type. It is stated in case of several values of parameters of stripe resonators their coupling coefficients values at frequencies higher than main one are zero. It is proposed a new method of expansion of suppressed frequency band of pass-band filters of array type, which is based on suppression of the first parasitic pass band due to zero coupling coefficient.

References

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

ARISTARKHOV G.M.; VERSHININ, Y.P. Microstripe filter of array type on a basis of multi-wire coupling lines with unequal phase velocities. Elekronnaya Tekhnika, Ser. Mikroelektronnyye Ustroystva, n.1, p.21-26, 1983.

MATTHAEI, G.L.; HEY-SHIPTON, G.L. Novel staggered resonator array superconducting 2.3-GHz bandpass filter. IEEE Trans. Microwave Theory Tech., v.41, n.12, p.2345-2352, Dec. 1993. DOI: http://dx.doi.org/10.1109/22.260727.

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

ZAKHAROV, A.V.; IL’CHENKO, M.E. Thin bandpass filters containing sections of symmetric strip transmission line. J. Commun. Technol. Electronics, v.58, n.7, p.728-736, 2013. DOI: http://dx.doi.org/10.1134/S1064226913060144.

CHIEN, WEI-CHIH; LIN, CHIH-MING; SINGH, P.K.; BASU, S.; HSIAO, CHIH-HUA; HUANG, GUO-WEI; WANG, YEONG-HER. MMIC compact filters with third harmonic suppression for V-band application. IEEE Microwave Wireless Compon. Lett., v.21, n.6, p.295-297, June 2011. DOI: http://dx.doi.org/10.1109/LMWC.2011.2140365.

LI, YUAN CHUN; ZHANG, XIU YIN; XUE, QUAN. Bandpass filter using discriminating coupling for extended out-of-band suppression. IEEE Microwave Wireless Compon. Lett., v.20, n.7, p.369-371, July 2010. DOI: http://dx.doi.org/10.1109/LMWC.2010.2049425.