Journal of Radio Electronics. eISSN 1684-1719. 2026. №1

Full text in Russian (pdf)

DOI: https://doi.org/10.30898/1684-1719.2026.1.6

MODELING AND EXPERIMENTAL STUDY
OF A NON-REFLECTIVE POLSK FILTER
BASED ON A THREE-WIRE MEANDER COUPLED LINE

A.A. Arutyunyan, N.D. Malyutin

Tomsk State University of Control Systems and Radioelectronics
634050, Russia, Tomsk, Lenin Ave., 40

The paper was received October 28, 2025.

Abstract. A non-reflective bandpass filter constructed using three-conductor coupled striplines and lumped RLC elements was simulated and experimentally studied using COMSOL Multiphysics. To reduce the filter's size, the planar coupled striplines are folded into a meander. The third stripline overlaps the first two, creating a face-to-face coupling between the current-carrying striplines and the third stripline. The effect of the relative permittivity of the dielectric layer separating the coupled current-carrying striplines from the third conductor on the non-reflective filter's characteristics was investigated. The feasibility of enhancing the electromagnetic coupling between the coupled striplines by using a three-conductor structure for constructing non-reflective bandpass filters was confirmed. The ratio of the relative permittivities of the substrates in the non-reflective filter's design was found to significantly affect the device's frequency characteristics. The best frequency characteristics of the transmission coefficient and return loss were obtained with a permittivity ratio in the range of 0.64–0.78. The approach used in this study allowed the filter dimensions to be reduced by a factor of 2. A comparison of the simulation results and experimental measurements showed that the filter parameters matched within the passband.

Key words: bandpass filter, non-reflective filter, quasi-planar filters, size reduction, frequency response, numerical simulation.

Financing: The work was carried out with the financial support of the Ministry of Science and Higher Education of the Russian Federation within the framework of project No. FEWM-2023-0014 dated 16.01.23.

Corresponding author: Arutyunyan Artush Arsenovich, arutyunyan18@mail.ru

References

1. M.A. Morgan and T.A. Boyd, "Theoretical and Experimental Study of a New Class of Reflectionless Filter," in IEEE Transactions on Microwave Theory and Techniques, vol. 59, no. 5, pp. 1214-1221, May 2011. https://doi.org/10.1109/TMTT.2011.2113189.

2. X. Wu, Y. Li and X. Liu, "High-Order Dual-Port Quasi-Absorptive Microstrip Coupled-Line Bandpass Filters," in IEEE Transactions on Microwave Theory and Techniques, vol. 68, no. 4, pp. 1462-1475, April 2020. https://doi.org/10.1109/TMTT.2019.2955692 .

3. Malyutin N.D., Loshchilov A.G., Ladur A.A. Chains of combined absorbing filters // 18th International Crimean Conference "Microwave Engineering and Telecommunication Technologies" (KrymiKo'2009): conference materials in 2 volumes. - Sevastopol: Weber Publishing House. 2008, pp. 489-490. (In Russian)

4. Distributed-lumped circuits and stripline microwave devices based on them: monograph / A.G. Loshchilov, T.T. Chin, G.A. Malyutin; edited by prof. N.D. Malyutin. Tomsk: Publishing house of Tomsk. state University of control systems and radioelectronics, 2023, pp. 25-27 p. (In Russian)

5. Loshchilov A. G. Reduction of return losses and suppression of out-of-band oscillations in interstage connections of communication systems using non-reflective frequency-selective microwave circuits / A.G. Loshchilov, N.D. Malyutin, Chin To Thanh, G.A. Malyutin // Control, Communications and Security Systems. 2024, no. 4, pp. 72-94. (In Russian)

6. Malyutin G.A., Thanh Ch.T. Algorithm and programs for analysis and synthesis of devices based on distributed-lumped circuits / G. A. Malyutin, Ch. T Thanh // International Journal of Open Information Technologies, 2024, vol. 12, no. 3, pp. 28-35. (In Russian)

7. Loshchilov A.G. Application of the autonomous block method to mathematical modeling of microwave devices containing distributed-lumped circuits / A. G. Loshchilov, N. D. Malyutin, T. T. Chin // International Journal of Open Information Technologies. - 2024. - Vol. 12, No. 1. - P. 61-67. (In Russian)

8. S. Banba and H. Ogawa, "Multilayer MMIC directional couplers using thin dielectric layers," in IEEE Transactions on Microwave Theory and Techniques, vol. 43, no. 6, pp. 1270-1275, June 1995. https://doi.org/10.1109/22.390182.

9. Arutyunyan A. A. Modeling and experimental study of a non-reflective filter based on a stripline three-wire coupled line // Reports of Tomsk State University of Control Systems and Radioelectronics. 2025, vol. 28, no. 2, pp. 55-61. (In Russian)

10. Pregla R. Die mäanderleitung als laufzeitausgleichsschaltung //AEÜ. 1967, vol. 21, no. 5, pp. 219.

11. Pregla R. Gruppenlaufzeitausgleich mit Mäanderleitungen für Nachrichtensysteme mit Rundhohlleitern //AEÜ. 1970, no. 9, pp. 381.

12. Malyutin N. D. et al. Stripline controlled meander delay lines // Reports of Tomsk State University of Control Systems and Radioelectronics. 2015, no. 4(38), pp. 42-46. (In Russian)

13. Nosov A. V. et al. A meander delay line of two turns protecting against ultrashort pulses // Reports of Tomsk State University of Control Systems and Radioelectronics. 2015, no. 3(37), pp. 120-123. (In Russian)

14. A. Khaleghi, "Dual Band Meander Line Antenna for Wireless LAN Communication," in IEEE Transactions on Antennas and Propagation, vol. 55, no. 3, pp. 1004-1009, March 2007. https://doi.org/10.1109/TAP.2007.891873.

15. V. K. and S. K. Menon, "Compact MSL Filter Using Meander Line Resonator," 2020 5th International Conference on Communication and Electronics Systems (ICCES), Coimbatore, India, 2020, pp. 414-417. https://doi.org/10.1109/ICCES48766.2020.9137941.

16. Malyutin N. D. Multiconnected strip structures and devices based on them. – Tomsk: Publishing house of Tomsk University, 1990, pp. 161. (In Russian)

17. Strip phase shifter. Vorobyov P.A., Malyutin N.D. Author's certificate SU 432843 A1, 05.07.1975. Application no. 1781634/26-9 dated 03.05.1972. (In Russian)

For citation:

Arutyunyan A.A., Malyutin N.D. Modeling and experimental study of a non-reflective stripline filter based on a three-wire meander coupled line. // Journal of Radio Electronics. – 2026. – №. 1. https://doi.org/10.30898/1684-1719.2026.1.6 (In Russian)