Nallagutlapalli Chandrashekarareddy, Bhaskarareddy, Ravi, Rashmi and Nwajana, Augustine O. ORCID: https://orcid.org/0000-0001-6591-5269 (2026) Development of a microstrip triplexer with high isolation for 5G sub-6 GHz applications. Designs, 10 (4). ISSN 2411-9660 (Online) (doi:10.3390/designs10040084)

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Abstract

The rapid proliferation of multi-standard fifth-generation (5G) new radio sub-6 GHz systems has intensified the demand for compact, high-isolation multiplexing components capable of simultaneously routing multiple frequency channels through a single shared antenna port without cross-band interference. This article presents the design and full-wave electromagnetic (EM) simulation of a compact microstrip triplexer operating at 2.2, 2.6, and 3.0 GHz for 5G sub-6 GHz applications. The proposed triplexer employs square open-loop resonators (SOLRs) arranged as three independent three-pole Chebyshev bandpass filter channels. Each channel is synthesized from a standard normalized Chebyshev lowpass filter prototype. The three channels are integrated at a common input port via a T-junction, with the connecting transmission line stubs dimensioned to enforce high inter-channel isolation. The triplexer is implemented on Rogers RT/Duroid 6010LM substrate. Full-wave EM simulation results demonstrate return losses of 21.1, 23.1, and 22.8 dB; insertion losses of 1.08, 1.01, and 0.98 dB; and inter-channel isolations of 45.7, 45.2, and 45.7 dB for ports S 32 , S 42 , and S 43 , respectively. The achieved inter-channel isolation exceeding 45 dB represents a significant improvement over the majority of recently reported microstrip triplexers operating in the sub-6 GHz range. The device occupies a compact circuit area of 0.34λg × 0.52λg. λg is the guided wavelength for the microstrip line impedance at the 2.6 GHz centre frequency of the triplexer.

Item Type:	Article
Uncontrolled Keywords:	bandpass filter, Chebyshev, channel filter, multiplexer, new radio, RF front-end, T-junction, wireless communication
Subjects:	T Technology > T Technology (General) T Technology > TA Engineering (General). Civil engineering (General) T Technology > TJ Mechanical engineering and machinery
Faculty / School / Research Centre / Research Group:	Faculty of Engineering & Science Faculty of Engineering & Science > School of Engineering (ENG) Faculty of Engineering & Science > School of Science (SCI)
Last Modified:	24 Aug 2026 15:45
URI:	https://gala.gre.ac.uk/id/eprint/54297

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