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Micromachines
Volume 17
Issue 7
10.3390/mi17070798
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This is an early access version, the complete PDF, HTML, and XML versions will be available soon.
Article

Numerical Investigation of a Compact Dual-Band SIW Filter Operating at 28/38 GHz for 5G Millimeter-Wave Systems

by
Khier Benderradji
1,
Boualem Hammache
1,
Idris Messaoudene
1,*,
Abdallah Hedir
2,3,*,
Salem Titouni
1,
Rabia Rebbah
1,4,
Massinissa Belazzoug
1 and
Nadhir Djeffal
1,5
1
ETA Laboratory, University Mohamed El Bachir El Ibrahimi, Bordj BouArreridj 34000, Algeria
2
Laboratoire de Technologies Avancées en Génie Electrique, University of Mouloud MAMMERI, BP 17 RP, Tizi-Ouzou 15000, Algeria
3
Advanced High Voltage Engineering Centre, School of Engineering, Cardiff University, Queen’s Buildings, The Parade, Cardiff CF24 3AA, UK
4
Department of Computer Science, National Higher School of Advanced Technologies (ENSTA), Algiers 16031, Algeria
5
Faculty of Electrical Engineering and Computer Science, University of Mouloud MAMMERI, Tizi Ouzou 15000, Algeria
*
Authors to whom correspondence should be addressed.
Micromachines 2026, 17(7), 798; https://doi.org/10.3390/mi17070798 (registering DOI)
Submission received: 28 April 2026 / Revised: 11 June 2026 / Accepted: 25 June 2026 / Published: 29 June 2026
(This article belongs to the Section E：Engineering and Technology)
Versions Notes

Abstract

With the rapid expansion of 5G millimeter-wave communications, there is a strong demand for compact, low-loss, and high-selectivity filtering components. This paper presents the design and analysis of a compact dual-band substrate integrated waveguide (SIW) bandpass filter operating at 28 GHz and 38 GHz for 5G applications. The proposed structure employs shunt iris-loaded resonators integrated within the SIW cavity to achieve dual-band operation with improved frequency selectivity. The designed filter provides a narrow passband of 1.2 GHz at 28 GHz and a wider passband of 2.6 GHz at 38 GHz, while maintaining a compact footprint of 8.5 mm × 6.2 mm. It is implemented on a Rogers RT/Duroid 5880 substrate (εr = 2.2, h = 0.508 mm), ensuring low dielectric loss and stable high-frequency performance. The simulated results demonstrate excellent return loss of 44.2 dB at 28.1 GHz and 52.7 dB at 38.3 GHz, along with a low insertion loss of approximately 0.68 dB, confirming efficient signal transmission. Furthermore, the design is validated using a simulation with ADS of second-order Butterworth equivalent circuit, providing design simplicity and demonstrating the feasibility of practical fabrication. On the other hand, it is well suited for integration into compact 5G front-end modules requiring high performance, miniaturization, and dual-band operation.
Keywords: dual-band bandpass filter; substrate integrated waveguide (SIW); millimeter-wave; 5G communication systems; Ka-band; compact microwave filter; iris resonator; 28 GHz; 38 GHz; HFSS; CST studio; ADS dual-band bandpass filter; substrate integrated waveguide (SIW); millimeter-wave; 5G communication systems; Ka-band; compact microwave filter; iris resonator; 28 GHz; 38 GHz; HFSS; CST studio; ADS

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MDPI and ACS Style

Benderradji, K.; Hammache, B.; Messaoudene, I.; Hedir, A.; Titouni, S.; Rebbah, R.; Belazzoug, M.; Djeffal, N. Numerical Investigation of a Compact Dual-Band SIW Filter Operating at 28/38 GHz for 5G Millimeter-Wave Systems. Micromachines 2026, 17, 798. https://doi.org/10.3390/mi17070798

AMA Style

Benderradji K, Hammache B, Messaoudene I, Hedir A, Titouni S, Rebbah R, Belazzoug M, Djeffal N. Numerical Investigation of a Compact Dual-Band SIW Filter Operating at 28/38 GHz for 5G Millimeter-Wave Systems. Micromachines. 2026; 17(7):798. https://doi.org/10.3390/mi17070798

Chicago/Turabian Style

Benderradji, Khier, Boualem Hammache, Idris Messaoudene, Abdallah Hedir, Salem Titouni, Rabia Rebbah, Massinissa Belazzoug, and Nadhir Djeffal. 2026. "Numerical Investigation of a Compact Dual-Band SIW Filter Operating at 28/38 GHz for 5G Millimeter-Wave Systems" Micromachines 17, no. 7: 798. https://doi.org/10.3390/mi17070798

APA Style

Benderradji, K., Hammache, B., Messaoudene, I., Hedir, A., Titouni, S., Rebbah, R., Belazzoug, M., & Djeffal, N. (2026). Numerical Investigation of a Compact Dual-Band SIW Filter Operating at 28/38 GHz for 5G Millimeter-Wave Systems. Micromachines, 17(7), 798. https://doi.org/10.3390/mi17070798

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