A New Design Approach for a Compact Microstrip Diplexer with Good Passband Characteristics

Abbas Rezaei; Salah I.  Yahya

doi:10.14500/aro.10999

Abbas Rezaei Department of Electrical Engineering, Kermanshah University of Technology, Kermanshah, Iran http://orcid.org/0000-0003-0642-6726
Salah I. Yahya Department of Communication and Computer Engineering, Cihan University-Erbil, Erbil, Kurdistan region – F.R. Iraq. (2) Department of Software Engineering, Faculty of Engineering, Koya University, Koya KOY45, Kurdistan region – F.R. Iraq http://orcid.org/0000-0002-2724-5118

Keywords: Compact, Diplexer, Insertion loss, Microstrip, Resonator, Return loss

Abstract

This paper presents an efficient theoretical design approach of a very compact microstrip diplexer for modern wireless communication system applications. The proposed basic resonator is made of coupled lines, simple transmission line and a shunt stub. The coupled lines and transmission line make a U-shape resonator while the shunt stub is loaded inside the U-shape cell to save the size significantly, where the overall size of the presented diplexer is only 0.008 λg2 . The configuration of this resonator is analyzed to increase intuitive understanding of the structure and easier optimization. The first and second resonance frequencies are f o1 = 895 MHz and f o2 = 2.2 GHz. Both channels have good properties so that the best simulated insertion loss at the first channel (0.075 dB) and the best simulated common port return losses at both channels (40.3 dB and 31.77 dB) are achieved. The presented diplexer can suppress the harmonics acceptably up to 3 GHz (3.3 fo1 ). Another feature is having 31% fractional bandwidth at the first channel.

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Author Biographies

Abbas Rezaei, Department of Electrical Engineering, Kermanshah University of Technology, Kermanshah, Iran

Abbas Rezaei is an Assistance Professor of Electrical Engineering in Kermanshah University of Technology. He received the B.Sc., M.Sc. and Ph.D. in Electronics Engineering from Razi University, Kerman-shah, Iran, in 2005, 2009 and 2013, respectively. His current research interests include RF and microwave circuits, computational intelligence and nanotechnology.

Salah I. Yahya, Department of Communication and Computer Engineering, Cihan University-Erbil, Erbil, Kurdistan region – F.R. Iraq. (2) Department of Software Engineering, Faculty of Engineering, Koya University, Koya KOY45, Kurdistan region – F.R. Iraq

Salah I. Yahya is a Professor, joined the Department of Software Engineering at Koya University in 2010. He has a B.Sc. degree in Electrical Engineering, M.Sc. degree in Electronics and Communication Engineering and Ph.D. degree in Communication and Microwave Engineering. He is a Consultant at the Iraqi Engineering Union. Dr. Yahya is a senior member of the IEEE-USA and a member of AMTA-USA, SDIWC-Hong Kong. His research interest include; Antenna, Microwaves, EMW propagation, Numerical Dosimetry, Microwave passive components design, ANN.

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