Expansion method of bandstop for compline bandpass filters

Authors

DOI:

https://doi.org/10.20535/RADAP.2019.79.16-23

Keywords:

input impedance, resonant frequencies, antiresonance frequencies, susceptance slope parameter, bandpass filter, stopband

Abstract

The article proposes a new method for expanding the stopband of combline bandpass filters (BPF) containing quarter-wave resonators. The filter contains resonators from segments of transmission lines of a quarter-wave length, one end of which is short-circuited. The quarter-wave (λ/4) resonators are oriented in one direction and are parallel to each other without mutual displacement. The disadvantage of such BPF is the many spurious passbands and not wide enough stopband located between the main passband and the first spurious passband. This method is based on the features of the input functions of λ/4 resonators, which appear at different coordinates of connection to these resonators. To obtain a wide stopband, spurious passband associated with higher (spurious) resonant frequencies 3f0, 5f0, 7f0, etc. are eliminated. For this, the resonators are connected to each other at special points located at a certain distance from the short-ends of λ/4 resonators. Using the proposed method, it is possible to suppress a significant number of spurious passbands in combline BPFs with λ/4 resonators, and make the stopband wide enough. In the article, a combline filter with inductive couplings between resonators and between end resonators and load is constructed. However, the proposed method allows us to use the other couplings between resonators. The results of frequency characteristics simulation are presented. The ratio R of the resonant frequency of the first non-suppressed (spurious) passband to the resonant frequency of the main passband increases with an increase in the BPF's order n. For n = 3, 4, 5 the values of R = 11, 13, 15 were obtained, respectively.

Author Biographies

S. M. Litvintsev, National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute"

Litvintsev S. N.

A. V. Zakharov, Igor Sikorsky Kyiv Polytechnic Institute Ukraine

Zakharov A. V., Doc. Sci (Tech), Senior Researcher

References

Перелік посилань

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References

Hong J.-S. (2011) Microstrip Filters for RF/Microwave Application. 2nd ed. New York: Wiley.

Xu J., Zhang X.Y. and Yang Y. (2019) High-Q-Factor Dual-Band Bandpass Filter and Filtering Switch Using Stub-Loaded Coaxial Resonators. 2019 IEEE MTT-S International Wireless Symposium (IWS). DOI: 10.1109/ieee-iws.2019.8803878

Wang K.X., Wong H., Xiang J. and Zhang X.Y. (2014) A miniaturized filtering power divider with wide stopband. 2014 International Symposium on Antennas and Propagation Conference Proceedings, . DOI: 10.1109/isanp.2014.7026527

Zakharov A.V., Ilchenko M.Y., Karnauh V.Y. and Pinchuk L.S. (2011) Stripline bandpass filters with step-impedance resonators. Radioelectronics and Communications Systems, Vol. 54, Iss. 3, pp. 163-169. DOI: 10.3103/s0735272711030071

Kuo J., Hsu C. and Shih E. (2007) Compact Planar Quasi-Elliptic Function Filter With Inline Stepped-Impedance Resonators. IEEE Transactions on Microwave Theory and Techniques, Vol. 55, Iss. 8, pp. 1747-1755. DOI: 10.1109/tmtt.2007.901604

G. L. Matthaei, L. Young, E. M. T. Jones (1980) Microwave Filters, Impedance-Matching Network, and Coupling Structures. Norwood, MA: Artech House.

Lin T., Kuo J. and Chung S. (2013) New miniaturized ring resonator bandpass filter with wide upper stopband. 2013 IEEE MTT-S International Microwave Symposium Digest (MTT), . DOI: 10.1109/mwsym.2013.6697738

Lin T., Kuo J. and Chung S. (2013) New miniaturized ring resonator bandpass filter with wide upper stopband. 2013 IEEE MTT-S International Microwave Symposium Digest (MTT). DOI: 10.1109/mwsym.2013.6697738

Gomez-Garcia R., Loeches-Sanchez R., Psychogiou D. and Peroulis D. (2018) Multi-Stub-Loaded Differential-Mode Planar Multiband Bandpass Filters. IEEE Transactions on Circuits and Systems II: Express Briefs, Vol. 65, Iss. 3, pp. 271-275. DOI: 10.1109/tcsii.2017.2688336

Zhang X.Y. and Xue Q. (2009) Harmonic-Suppressed Bandpass Filter Based on Discriminating Coupling. IEEE Microwave and Wireless Components Letters, Vol. 19, Iss. 11, pp. 695-697. DOI: 10.1109/lmwc.2009.2032002

Li Y.C., Zhang X.Y. and Xue Q. (2010) Bandpass Filter Using Discriminating Coupling for Extended Out-of-Band Suppression. IEEE Microwave and Wireless Components Letters, Vol. 20, Iss. 7, pp. 369-371. DOI: 10.1109/lmwc.2010.2049425

Lin S., and Chen C.H. (2006) Extended-stopband bandpass filter using both half- and quarter-wavelength resonators. IEEE Microwave and Wireless Components Letters, Vol. 16, Iss. 1, pp. 43-45. DOI: 10.1109/lmwc.2005.860014

Zakharov A.V., Il’chenko M.E. and Korpach V.N. (2014) Features of the coupling coefficients of planar stepped-impedance resonators at higher resonance frequencies and application of such resonators for suppression of spurious passbands. Journal of Communications Technology and Electronics, Vol. 59, Iss. 6, pp. 550-556. DOI: 10.1134/s1064226914060217

Zakharov A.V. (2012) Expanding the rejection band of planar bandpass filters. Journal of Communications Technology and Electronics, Vol. 57, Iss. 1, pp. 95-100. DOI: 10.1134/s1064226911090105

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Published

2019-12-30

How to Cite

Литвинцев, С. Н. and Захаров, А. В. (2019) “Expansion method of bandstop for compline bandpass filters”, Visnyk NTUU KPI Seriia - Radiotekhnika Radioaparatobuduvannia, (79), pp. 16-23. doi: 10.20535/RADAP.2019.79.16-23.

Issue

No. 79 (2019)

Section

Electrodynamics. Microwave devices. Antennas

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