Prof. Dr. Ahmed Abdelwahed Kishk
Concordia University, Montréal, Quebec, Canada
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Academic Career Length
22Years (2005-Present)
(Calculated once Scilit publication data is synced: current year − year of first publication + 1)
Representative Publications
View All Publications4 February 2019 in IEEE Transactions on Antennas and Propagation
Journal Article
XTXiaohua Tan
Xiaohua Tan
WWWeimin Wang
Weimin WangYWYongle Wu
Yongle WuYLYuanan Liu
Yuanan Liu
Ahmed Abdelwahed KishkA closely located dual-band meander-line antennas with isolation enhancement by inserting novel split electromagnetic bandgap (EBG) uniplanar structure is proposed. The meander-line antenna is coupled to a parasitic rectangular patch to achieve the dual-band operation. Splits are applied on the surface of an EBG structure to cause decoupling at the first resonant mode and utilizing an EBG structure to decouple at the second resonant mode. The prototype of the proposed structure achieves a dual band of 180 MHz (3.42-3.6 GHz) and 400 MHz (4.7-5.1 GHz). The mutual coupling is significantly reduced by 26 and 44 dB at 3.48 and 4.88 GHz, respectively, compared to the reference antenna. In addition, the structure has high front-to-back ratio radiation characteristics.
8 June 2018 in IEEE Transactions on Antennas and Propagation
Journal Article
MKMohsen Khalily
Mohsen KhalilyRTRahim Tafazolli
Rahim Tafazolli
Pei XiaoAhmed Abdelwahed KishkA Ka-band inset-fed microstrip patches linear antenna array is presented for the fifth generation (5G) applications in different countries. The bandwidth is enhanced by stacking parasitic patches on top of each inset-fed patch. The array employs 16 elements in an H-plane new configuration. The radiating patches and their feed lines are arranged in an alternating out-of-phase 180-degree rotating sequence to decrease the mutual coupling and improve the radiation pattern symmetry. A (24.4%) measured bandwidth (24.35 to 31.13 GHz)is achieved with -15 dB reflection coefficients and 20 dB mutual coupling between the elements. With uniform amplitude distribution, a maximum broadside gain of 19.88 dBi is achieved. Scanning the main beam to 49.5° from the broadside achieved 18.7 dBi gain with -12.1 dB sidelobe level (SLL). These characteristics are in good agreement with the simulations, rendering the antenna to be a good candidate for 5G applications.
27 June 2016 in IEEE Antennas and Wireless Propagation Letters
Journal Article
ADAbdolmehdi Dadgarpour
Abdolmehdi Dadgarpour
BZBehnam Zarghooni
Behnam Zarghooni
BVBal S. Virdee
Bal S. Virdee
TDTayeb A. Denidni
Tayeb A. Denidni
Ahmed Abdelwahed KishkAn effective technique for reducing the mutual coupling between two dielectric resonator antennas (DRAs) operating at 60-GHz bands is presented. This is achieved by incorporating a metasurface between the two DRAs, which are arranged in the H-plane. The metasurface comprises an array of unique split-ring resonator (SRR) cells that are integrated along the E-plane. The SRR configuration is designed to provide bandstop functionality within the antenna bandwidth. By loading the DRA with 1 × 7 array of SRR unit cells, a 28-dB reduction in the mutual coupling level is achieved without compromising the antenna performance. The measured isolation of the prototype antenna varies from -30 to -46.5 dB over 59.3-64.8 GHz. The corresponding reflection coefficient of the DRA is better than -10 dB over 56.6-64.8 GHz.
1 April 2020 in IEEE Microwave Magazine
Journal Article
STSajjad Taravati
Sajjad Taravati
Ahmed Abdelwahed Kishk8 October 2018 in IEEE Transactions on Antennas and Propagation
Journal Article
AVAbbas Vosoogh
Abbas VosooghAHAbolfazl Haddadi
Abolfazl Haddadi
AZAshraf Uz Zaman
Ashraf Uz Zaman
Jian YangHZHerbert Zirath
Herbert ZirathAhmed Abdelwahed KishkThis paper presents a gap waveguide based compact monopulse array antenna, which is formed with four unconnected layers, for millimeter-wave tracking applications at W-band (85105 GHz). Recently developed gap waveguide technology removes the need for galvanic contact among metallic layers of waveguide structures, and thereby, makes the proposed antenna suitable for easy and low-cost manufacturing. In this context, a low-loss planar Magic-Tee is designed to be used in a monopulse comparator network consisting of two vertically stacked layers. The gap waveguide planar monopulse comparator network is integrated with a high-efficiency 1616 corporate-fed slot array antenna. The measured results of the comparator network show the amplitude and phase imbalance values to be less than 0.5 dB and 2°, respectively, over the frequency band of interest. The fabricated monopulse array antenna shows relative impedance bandwidths of 21% with input reflection coefficients better than 10 dB for the sum and difference ports. The null in the difference radiation pattern is measured to be 38 dB below the peak of the sum radiation pattern at 94 GHz. The measured gain is about 30 dBi for the same frequency. The low-loss performance of the comparator network and the feed-network of the proposed array, together with the simple and easy manufacturing and mechanical assembly, makes it an excellent candidate for W-band compact direction-finding systems.
9 March 2021 in IEEE Antennas and Wireless Propagation Letters
Journal Article
A compact structure with slot splitting meandered lines defected ground is proposed to reduce the mutual coupling between two microstrip antennas with a center-to-center distance of 0.38λ. The meandered line defected ground structure is symmetrically etched on the ground between the microstrip antennas. The proposed structure is optimized and explained by the common/differential mode theory. For experimental verification, the structure is fabricated and measured. Simulation and measurement results with excellent agreement show that the mutual coupling can be reduced significantly using the proposed structure. In addition, significant improvement is achieved in radiation efficiency, realized gain, and the decoupled array's envelope correlation coefficient.
About Me
Ahmed A. Kishk received an M.Eng. and a Ph.D. from the University of Manitoba, Canada, in 1983 and 1986, respectively. He was a professor at the University of Mississippi (1986-2011). He was on sabbatical leave at Chalmers University of Technology, Sweden, during the 1994-1995 and 2009-2010 academic years. He has been a professor at Concordia University, Montréal, Québec, Canada (since 2011) and a Tier 1 Canada Research Chair in Advanced Antenna Systems (2011-2025). He served as an Associate Editor of AP-S Newsletters from 1990 to 1993; Editor of Feature Articles in Antennas & Propagation Magazine (1993-2014); Co-Editor of a special issue in the ACES Journal in 1995; an editor in 1997-1998; and Editor-in-Chief from 1998 to 2001. From 2013 to 2015, he was a distinguished lecturer and an AdCom member for AP-S; he served as President-Elect in 2016 and President in 2017. He co-guest-edited IEEE AWPL on a special cluster. From 2013 to 2015, he was a distinguished lecturer and an AdCom member for AP-S; he served as President-Elect in 2016 and President in 2017. He published over 518 refereed journal articles; co-authored four books and 13 chapters; and edited eight books and several short courses. According to Google Scholar, his H-index is 86. In 2026, ScholarGPS ranked him in the top 0.05% of all scholars worldwide: Lifetime #227 in ECE, #2 in Antennas (Radio), #2 in DR, #9 in Dielectric, # 36 in Optical Engineering, and #58 in Microwave.