Shoukry Shams

Dr. Shoukry Shams

Electrical and Computer Department, Concordia University, Montréal, Quebec, Canada
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Academic Career Length

17Years (2010-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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18 December 2017 in IEEE Access
Verified
Journal Article
Open access
Mohamed Mamdouh M. AliMohamed Mamdouh M. Ali
Mohamed Mamdouh M. Ali
Shoukry ShamsShoukry Shams
Shoukry Shams
ASAbdel-Razik Sebak
Abdel-Razik Sebak
Communication systems are witnessing an outstanding revolution that has a clear impact on all aspects of life. The world technology is drifting towards high frequency and data rate solutions to accommodate the future expansion in applications such as 5G communications. The 5G technology will offer advanced features in the mm-Wave frequency band which requires intelligent subsystems such as beam switching. Therefore, the microwave components, specially couplers, still need a significant improvement to follow the rapid variations in future technologies. One of the most recent and promising guiding technologies for mm-Wave applications is the printed ridge gap waveguide (PRGW). In this paper, a design of 3-dB planar quadrature hybrid coupler based on PRGW is presented. The proposed design has superior characteristics such as compactness, low loss, and low dispersion device. The prototype of the proposed coupler is fabricated and tested, where the measured and simulated results show an excellent agreement.
14 April 2017 in IEEE Transactions on Microwave Theory and Techniques
Verified
Journal Article
Closed access
Shoukry ShamsShoukry Shams
Shoukry Shams
Ahmed Abdelwahed KishkAhmed Abdelwahed Kishk
Ahmed Abdelwahed Kishk
Hybrid couplers are essential devices in various microwave circuits and systems, such as radar systems and beam forming networks. The development of this device is necessary along with the development of the new communication standards for the most modern guiding structures. One of the most recent and promising guiding technologies is the ridge gap waveguides, which is expected to play an essential role in the millimeter wave and submillimeter wave applications, not only the 5G communications but also other future communication. Therefore, standards are recommended to make use of the high-frequency guiding structures. In this paper, a design procedure for the hybrid couplers is presented. The frequency band of interest is centered at the 15 GHz, which can be deployed for both the 5G mobile communication and the airborne radar applications. The proposed design is fabricated and measured. The measured and simulated results are in excellent agreement.
29 September 2016 in IEEE Transactions on Microwave Theory and Techniques
Verified
Journal Article
Closed access
Shoukry ShamsShoukry Shams
Shoukry Shams
Ahmed Abdelwahed KishkAhmed Abdelwahed Kishk
Ahmed Abdelwahed Kishk
Recently, ridge gap waveguides are considered as guiding structures in high-frequency applications. One of the major problems facing this guiding structure is the limited ability of using all the possible bandwidths due to the limited bandwidth of the transition to the coaxial lines. Here, a review of the different excitation techniques associated with this guiding structure is presented. Next, some modifications are proposed to improve its response in order to cover the possible actual bandwidth. The major aim of this paper is to introduce a wideband coaxial to ridge gap waveguide transition based on five sections of matching networks. The introduced transition shows excellent return loss, which is better than 15 dB over the actual possible bandwidth for double transitions.
26 April 2018 in IEEE Transactions on Microwave Theory and Techniques
Verified
Journal Article
Closed access
MAMohamed A. Abdelaal
Mohamed A. Abdelaal
Shoukry ShamsShoukry Shams
Shoukry Shams
MMMohamed A. Moharram
Mohamed A. Moharram
MEMahmoud Elsaadany
Mahmoud Elsaadany
Ahmed Abdelwahed KishkAhmed Abdelwahed Kishk
Ahmed Abdelwahed Kishk
A nonstandard dual mode, double-ridge waveguide is utilized to design a compact orthomode transducer (OMT). The OMT is terminated with a standard circular waveguide common port and two standard isolated rectangular waveguide ports. The proposed structure exploits a one-fold symmetry to eliminate the coupling to the in-band higher order odd modes within the common port. The proposed concept is utilized to design a full K1-band OMT that is essential for space and mobile applications. Furthermore, the performance of the proposed OMT design is verified through a back-to-back measurement showing an excellent agreement between the full-wave simulations and measurements. Nevertheless, the proposed design achieves a measured matching level of $19$ dB for the two modes and isolation level between them beyond $30$ dB over the entire band.
24 February 2021 in IEEE Transactions on Microwave Theory and Techniques
Verified
Journal Article
Closed access
Shoukry ShamsShoukry Shams
Shoukry Shams
SSSyed M. Sifat
Syed M. Sifat
MEMahmoud Elsaadany
Mahmoud Elsaadany
GGGhyslain Gagnon
Ghyslain Gagnon
Ahmed Abdelwahed KishkAhmed Abdelwahed Kishk
Ahmed Abdelwahed Kishk
A Y-junction circulator based on the ridge gap waveguide (RGW) as a hosting guiding structure is designed using a developed closed-form systematic procedure. To validate the structure, an air-filled-to-dielectric-filled transition is proposed using a substrate perforation technique. The proposed RGW circulator covers the whole Ku-band with a matching bandwidth throughout the operational bandwidth below -15 dB. A prototype is fabricated and tested, providing a satisfactory agreement with the simulated results.
31 December 2021 in IEEE Transactions on Antennas and Propagation
Verified
Journal Article
Closed access
SSSyed M. Sifat
Syed M. Sifat
Shoukry ShamsShoukry Shams
Shoukry Shams
Ahmed Abdelwahed KishkAhmed Abdelwahed Kishk
Ahmed Abdelwahed Kishk
This work proposed a solution of structures built from stacking several dielectric substrates with the conducting cladding aiming for electrical contact between them (PEC-PEC). At millimeter-wave frequencies, surface roughness or imperfect flat surfaces present possible gaps that cause severe unexpected leakage. Many engineers overlooked this problem. To prevent this leakage, we propose transforming one of the PEC-PEC surfaces into artificially magnetic conductors (AMC), creating a PEC-AMC layer that suppresses any leakage even with no contact between the surfaces the gap is less than a quarter wavelength. A wideband multilayer pyramidal horn antenna using substrate integrated gap waveguide (SIGW) technology is proposed as an example that highlights the proposed solution. In each layer of the horn, the opening is surrounded by periodic cells to suppress leakage and surface waves. In addition, the upper surface surrounding the horn’s opening is surrounded by EBG mushroom cells to act as a soft surface that suppresses the surface waves and reduces the edge diffraction, and, in turn, improves the radiation characteristics of the horn. The horn achieved a Gain of 11.5 dBi and 20.5 % bandwidth (28.5-35 GHz). The simulated and measured results show excellent agreement with each other.