In Cooperation with Duy Tan University, a KOU Professor Published a Research Article Indexed by WoS.

Professor Salah I. Yahya from the Department of Software Engineering, Faculty of Engineering at Koya University with a research group from Duy Tan University, Vietnam published a research article entitled “A Low-loss Four-Channel Microstrip Diplexer for Wideband Multi-Service Wireless Applications” in the AEU - International Journal of Electronics and Communications. 

About the authors:
Salah I. Yahya is a Professor at the Department of Software Engineering, Faculty of engineering, Koya University. He is the Director of Quality Assurance and Curriculum Development. He has a Ph.D. in MW and Communication Engineering. Prof. Yahya has more than 55 published scientific papers, most in journals indexed by Clarivate Analytics. Prof. Yahya is a Senior Member of IEEE. For more information click her.

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Leila Noori 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.

Journal Coverage
Title: AEU - International Journal of Electronics and Communications
Clarivate Analytics (Wos: IF = 2.924)
Science Citation Index
Science Citation Index Expanded
Publisher: Elsevier GMBH
Country: Netherland

About the Paper:
Title: A Low-loss Four-Channel Microstrip Diplexer for Wideband Multi-Service Wireless Applications

In this work, a new quad-band microstrip diplexer is designed and fabricated. It consists of two bandpass filters (BPFs) coupled to a U-shape junction. The proposed resonator is a novel stub-loaded U-shape structure. The design process is based on proposing and analysing an approximated LC model of the presented resonator so that the design method gives general information about resonator performance. Based on this information, our diplexer is optimized to have a good performance. Our diplexer resonance frequencies are tuned at 1.8 GHz, 2.45 GHz, 3.5 GHz and 5.2 GHz. The proposed diplexer has four wide fractional bandwidths (FBWs) of 13%, 17.3%, 18.9% and 17.7%, which are the widest FBWs compared to the previously reported four-channel diplexers. Therefore, it is suitable for multi-service wideband applications. Moreover, it has high selectivity, low losses and reasonable isolation. The fabricated diplexer is measured and a good agreement between the simulation and measurement results is obtained.


Koya University (KOU) is located in the city of Koya (Koy Sanjaq) which is 1.0 hr drive to the East of the Kurdistan Region capital Erbil (Arbil, Hewlér) in Kurdistan Region of F.R. Iraq. It is on the foothills of beautiful high mountain. Its campus has been carefully laid out to embrace the beautiful mountainous nature. . There are 4 Faculties and 2 Schools in KOU; Faculty of Engineering (FENG), Faculty of Science and Health (FSCH), Faculty of Education (FEDU), Faculty of Humanities and Social Silences (FHSS), Shcool of Physical Education (SPHE) and School of Medicine (SMED). Also, there are two research centers; Genome Center and Malai Gawra Center. Moreover, at KOU there is an English Language Center (BELC) at KOU has been opened with the sponsorship of IREX and American embassy in Baghdad as well as with the support of Spring International Language Center of The University of ArkansasKOU has two Scientific Journals; ARO-The Scientific Journal of Koya University, which is indexed by Clarivate Analytics (ESCI), and Koya University Journal of Humanities and Social Sciences (KUJHSS). KOU is a proactive member of Erasmus/ Marhaba Project and Erasmus+. KOU signed many Memorandum of Understandings (MoU) with many International Universities, e.g., The University of Arkansas (June 2015). The Lulea University in Sweden (April 2014), The University of Nottingham in the UKThe University of Buckingham in the UK (Oct 2008), Belkin University in Turkey (Sep 2009) and The University of Greenwich in the UK.


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