Novel Design of a Lowpass-Bandpass Diplexer with an Exceptional Performance Using Microstrip Meandrous Loaded Lines for Microwave Systems

Authors

DOI:

https://doi.org/10.14500/aro.12549

Keywords:

Diplexer, Fractional Bandwidth, Insertion Loss, Lowpass-bandpass, Insertion loss

Abstract

A new microstrip lowpass-bandpass diplexer with exceptional performance characteristics is designed and analyzed. It includes microstrip meandrous thin lines loaded by solid cells. The diplexer achieves 0.058 dB and 0.013 dB low insertion losses (ILs) and 26.4% wide fractional bandwidth (FBW). Operating frequencies are obtained using a perfect mathematical method, which are verified by the simulation results. Having two equations that accurately predict the operating frequencies allows us to optimize the diplexer's performance by adjusting key parameters such as line lengths and widths. This helps in achieving the desired operating frequencies with minimal trial and error. It has 0.01 λg2 very compact size and exhibits low group delays at both channels, which make it appropriate for a varied range of applications requiring high precision and efficiency. Overall, this microstrip diplexer design offers a versatile and reliable solution for demanding RF and microwave applications.

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Author Biographies

Salah I. Yahya, Department of Computer Technology Engineering, College of Technical Engineering, Al-Hadba University, Mosul, Iraq

Salah I. Yahya is a Professor at the the Department of Computer Technology Engineering, College of Technical Engineering, Al-Hadba University, Mosul, Iraq. He received the B.Sc. degree in electrical engineering, the M.Sc. degree in electronics and communication engineering, and the Ph.D. degree in communication and microwave engineering. He is a Consultant Engineer and a Senior Member of IEEE. His research interests include antenna design, numerical RF dosimetry, MW measurement, and MW components design.

Mohammed Abdel Hafez, Department of Electrical and Communication Engineering, United Arab Emirates University, Al Ain, United Arab Emirates

Mohammed Abdel-Hafez is an Associate Professor in the Department of Electrical Engineering (Communications) at United Arab Emirates University, UAE. He received his B.Sc., M.Sc., and Ph.D. degrees in Electrical and Electronic Engineering from Eastern Mediterranean University, Northern Cyprus, and Turkey, in 1992, 1994, and 1997, respectively. From 1992 to 1997, he was a Research Engineer at the Department of Electrical and Electronic Engineering, EMU, Turkey. In 1995, he served as an instructor at the Department of Electrical Engineering at Al-Quds University. From 1997 to 1999, he served as a manager of the data communication section at Palestine Telecommunication Company (PALTEL). In August 1999, he joined the Centre for Wireless Communications at the University of Oulu as a senior research scientist and project manager. Abdelhafez is a frequent visiting professor at the University of Oulu's Centre for Wireless Communications in Oulu, Finland. His research interests include Wireless communication systems, wireless body area networks, wireless capsule endoscopy, Artificial Intelligence and Machine Learning, Localization techniques for in-body sensors, Digital Signal processing, sensor networks and applications, 6G radio access, RF and microwave techniques, microstrip devices, Ultra-Wideband communication, smart grid communication, Cooperative and Relay communication systems, cognitive radio networks, and spectrum managemen

Leila Nouri , (1) Institute of Research and Development, Duy Tan University, Da Nang, Vietnam; (2) School of Engineering and Technology, Duy Tan University, Da Nang, Vietnam

Leila Nouri is a staff member, with a Ph.D. degree, at the Faculty of Electrical - Electronic Engineering, Duy Tan University. She is also a researcher at the Institute of Research and Development, Duy Tan University, Da Nang, 550000, Viet Nam.

Farid Zubir, Wireless Communication Centre, Faculty of Electrical Engineering, Universiti Teknologi Malaysia, Johor Bahru, Johor, Malaysia

Farid Zubir is an Assistant Professor with the Department of Communication Engineering, Faculty of Electrical Engineering, UTM.  He received the B.Eng. degree in electrical, majoring in Telecommunication, and the M.Eng. degree in RF and Microwave from Universiti Teknologi Malaysia (UTM), in 2008 and 2010, respectively, and the Ph.D. degree from the University of Birmingham, U.K., in 2016, for research into direct integration of power amplifiers with antennas in microwave transmitters. He is currently an Assistant Professor with the Department of Communication Engineering, Faculty of Electrical Engineering, UTM. In 2019, he was an Honorary Postdoctoral Research Fellow for two years with the University of British Columbia (UBCO), Okanagan, Canada, where he conducted research into highly efficient and linear amplification power amplifier topology for wireless power systems. His research interests include RF and Microwave technologies, including analog circuits, planar array antennas, dielectric resonator antennas (DRA), and active integrated antennas (AIA). Dr. Zubir is a member of IEEE.

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Published

2025-12-01

How to Cite

Yahya, S. I. (2025) “Novel Design of a Lowpass-Bandpass Diplexer with an Exceptional Performance Using Microstrip Meandrous Loaded Lines for Microwave Systems”, ARO-THE SCIENTIFIC JOURNAL OF KOYA UNIVERSITY, 13(2), pp. 304–313. doi: 10.14500/aro.12549.

Issue

Vol. 13 No. 2 (2025): Edition Twenty Five

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Copyright (c) 2025 Salah I. Yahya, Mohammed A. Hafez, Leila Nouri , Farid Zubir

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Received 2025-08-24
Accepted 2025-11-15
Published 2025-12-01

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