Professor Dr. Salah I. Yahya, working in the Department of Software Engineering at Koya University, published a research paper in the Symmetry journal that published by MDPI and indexed by the Clarivate Analytics (Wos: IF = 3.940, Q2), This research work is a collaboration with researchers from Islamic Azad University, Al-Esraa University College and Vietnamese-German University. The research article is about design and fabrication of a Filtering Power Divider with Simple Symmetric Structure.

About the author:
Name: Salah I. Yahya
Qualification: Ph.D.

Academic rank: Professor
Affiliation: Department of Software Engineering, Faculty of Engineering, Koya University
Google Scholar account:
ORCID account:

Journal Coverage

Clarivate Analytics (WoS: IF = 2.940)
Science Citation Index
Science Citation Index Expanded
Publisher: MDPI 

About the paper
Title: Design of a Filtering Power Divider with Simple Symmetric Structure Using StubsDOI:
Type: Open Access

A power divider (PD) with a wide stopband and simple symmetric structure using open- and short-ended stubs is analyzed and implemented in this paper. In the proposed power divider, for the first time, the output resistor is divided into two sections and open- and short-ended stubs are used between the resistors. The incorporated open- and short-ended stubs have resulted in a controllable bandwidth for the proposed PD, which resulted in 40% of the fractional bandwidth considering 3 dB attenuation of insertion loss. The proposed PD operates at 2 GHz, which shows more than 20 dB attenuation for the return and isolation losses. In addition, the obtained insertion loss at the operating frequency is approximately 0.3 dB, which shows a minor loss, and also, high isolation is achieved in the device. Moreover, 20 dB and 30 dB attenuation levels have been achieved for second and third harmonics. The results show high performance for the proposed power divider.


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) The University of Greenwich in the UKCihan University-Erbil (2021) and Tishk International University (2021). Koya University is a memebr of The Association of Arab Universities and the International Association of Universities.

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News Date
A Professor in the DSWE at KOU Published a Research Article in a WoS-Indexed Journal; Symmetry