Low-pass filters based on crystal-like inhomogeneities





microstrip structure, electromagnetic crystals inhomogeneity, low-pass filter, LPF


The paper proposes microstrip low-pass filters (LPF) based on three-dimensional electromagnetocrystalline inhomogeneities (ECI). The calculated responses (AFRs) of quasi-lumped reactive elements based on traditional and ECI structures are compared. AFRs of quasi-lumped ECI-based reactive elements are noticeably close to AFRs of lumped elements. The frequency of the AFR first minimum of ECI-based LPF is three times as large as the similar frequency of LPF based on traditional structures. Combined ECI incorporating the inductive and capacitive elements are also proposed. LPF structures based on single and combined ECI are presented. The calculated and experimental parameters and AFRs of filters are presented that illustrate a significant size reduction and performance improvement in the suppression band as compared to the filter having the traditional structure. The amplitude-frequency characteristics have been calculated using the three-dimensional simulation in the environment of CST Microwave Studio software package.


HONG, J.-S. Microstrip Filters for RF/Microwave Applications. N. Y.: Wiley, 2011.

MARTIN, F. Artificial Transmission Lines for RF and Microwave Applications. New Jersey: Wiley, 2015.

KAHLER, J.; EGGER, A.M. “Designing filters with defects can optimize results,” Microwaves&RF, Mar. 15, 2018. URI: http://www.mwrf.com/software/filters-use-resonators-dms-can-produce-optimal-results.

COONROD, J. “Microstrip defected ground structures without radiation loss using multilayer PCB technology,” Microwave J., Feb. 14, 2018. URI: http://www.microwavejournal.com/articles/29710-microstrip-defected-ground-structures-without-radiation-loss-using-multilayer-pcb-technology.

KHANDELWAL, M.K.; KANAUJIA, B.K.; KUMAR, S. “Defected ground structure: fundamentals, analysis, and applications in modern wireless trends,” Int. J. Antennas Propag., v.2017, article ID 2018527, p.22, 2017. DOI: https://doi.org/10.1155/2017/2018527.

CHEN, L.; LI, X.Y.; WEI, F. “A compact quad-band bandpass filter based on defected microstrip structure,” Frequenz, v.71, n.7-8, p.311-316, 2017. DOI: https://doi.org/10.1515/freq-2016-0238.

ELVI, T.A. “Electromagnetic band gap structures based on ultra wideband microstrip antenna,” Microwave Optical Technol. Lett., v.59, n.4, p.827-834, 2017. DOI: https://doi.org/10.1002/mop.30397.

ANGADI, S.; VISWANADHA, K.; SREE, R.R.; MADAKA, S. “Study of reflection losses in tuned and EBG power dividers at S, C, X and upper Ku bands,” Int. J. Sc. Res. Network Security Commun., v.5, n.6, p.21-26, 2017. DOI: https://doi.org/10.26438/ijsrnsc/v5i6.2126.

NAZARKO, A.I.; NELIN, E.A.; POPSUI, V.I.; TIMOFEEVA, Y.F. “High-selectivity electromagnetic crystal,” Tech. Phys., v.55, n.4, p.569-570, 2010. DOI: https://doi.org/10.1134/S1063784210040237.

NELIN, E.A.; NAZARKO, A.I. “Effective electromagnetocrystalline inhomogeneities,” Tech. Phys., v.58, n.4, p.612-614, 2013. DOI: https://doi.org/10.1134/S1063784213040166.

BIDENKO, P.S.; NELIN, E.A.; NAZARKO, A.I.; ADAMENKO, Y.F. “Quasi-lumped reactive elements based on crystal-like discontinuities,” Radioelectron. Commun. Syst., v.58, n.11, p.515-521, 2015. DOI: https://doi.org/10.3103/S0735272715110059.

GARD, R.; BAHL, I.; BOZZI, M. Micristrip Lines and Slotlines, 3rd ed. Boston-London: Artech House, 2013.

NELIN, E.A. “Simulation and improvement of the selectivity of crystal-like structures,” Tech. Phys., v.49, n.11, p.1464-1468, 2004. DOI: https://doi.org/10.1134/1.1826191.

NELIN, E.A. “Edge apodization of crystal-like structures,” Tech. Phys., v.50, n.11, p.1511-1512, 2005. DOI: https://doi.org/10.1134/1.2131963.





Research Articles