Wael M. Abdel-Wahab
University of Waterloo
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Publication
Featured researches published by Wael M. Abdel-Wahab.
IEEE Antennas and Wireless Propagation Letters | 2011
Wael M. Abdel-Wahab; Safieddin Safavi-Naeini
A wide-bandwidth aperture-coupled microstrip patch antenna (MPA) fed by substrate integrated waveguide (SIW) technology is presented at V-band (60 GHz) to enhance the overall radiation efficiency. The antenna is designed using two different slot configurations with a simulated impedance bandwidth of 22% and gain up to 6.8 dB. Furthermore, the antennas show wideband radiation characteristics. The simulated radiation efficiency is better than 98% within the operating impedance bandwidth.
IEEE Transactions on Antennas and Propagation | 2011
Wael M. Abdel-Wahab; Dan Busuioc; Safieddin Safavi-Naeini
A low cost general architecture for a substrate integrated waveguide (SIW) series-fed dielectric resonator antenna (DRA) array, formed by two different slot polarizations, is proposed. In addition, a novel, simple, and generic transmission line (T.L.) circuit model, along with a fast and generic formulation for the new linear array antenna, is developed. The model can be used for reflection coefficient and radiation pattern (gain) calculations. The experimental data from two linear array modules, operating at the millimeter-wave band, are used to verify the simulated results of HFSS and the proposed model results. The measured radiation pattern for a 4 × 1 SIW-DRA array demonstrates a broadside beam with a radiated gain of 11.70 dB over an operating impedance bandwidth of 4.70%. Moreover, the simulated radiation efficiency is more than 90%.
international symposium on antennas and propagation | 2011
Wael M. Abdel-Wahab; Safieddin Safavi-Naeini; Dan Busuioc
A novel low cost feeding mechanism based upon new synthesized planar waveguide substrate integrated waveguide (SIW), is presented for microstrip antenna arrays (MPAs) at millimeter-wave (mmW) band to avoid feeding loss, specially the conduction loss. As an example, SIW-fed two dimensional (2D) 2×2 MPA array @ 60 GHz is introduced. The presented antenna is simulated by HFSS to validate its performance for mmW applications. The simulated results show a broadside gain of 11.71 dB within an operating impedance bandwidth of 500 MHz around a center frequency of 59.95 GHz. Also, the simulated radiation efficiency of the developed antenna is better than 85%, which is higher than that of conventional mmW microstrip antenna array.
IEEE Antennas and Wireless Propagation Letters | 2011
Wael M. Abdel-Wahab; Safieddin Safavi-Naeini; Dan Busuioc
A planar, high-Q-factor, low-cost, and low-profile waveguide feeding scheme, based upon the substrate integrated waveguide (SIW) concept, for a rectangular dielectric resonator antenna (RDRA) at the millimeter wave (mmW) band is presented. It helps to enhance the overall antenna radiation efficiency and avoid any disturbance caused by conventional feeding schemes. Furthermore, a simple transmission line (T.L.) circuit model is proposed as an easy method to calculate the antenna reflection coefficient and radiation pattern (gain). As an example, a 1 × 8 linear antenna array is used to validate the usefulness of the feeding scheme and the proposed T.L. circuit model. The simulated results obtained by the circuit model are presented in this letter and compared to those calculated by the full-wave numerical (HFSS) solver.
IEEE Antennas and Wireless Propagation Letters | 2016
Wael M. Abdel-Wahab; Ying Wang; Safieddin Safavi-Naeini
Simulation and experimental results of substrate integrated waveguide (SIW)-integrated 2-D dielectric resonator antenna (DRA) array operating at millimeter-wave frequency band are presented. The antenna array consists of 64 elements arranged in 8 ×8. Hybrid feeding network combining series-fed and corporate-fed is used to provide a uniform power distribution over the entire aperture of the array. The antenna array is fabricated and tested. The measured reflection coefficient shows an impedance bandwidth ( S11 ≤ - 10 dB) of 2 GHz and a measured gain of 21.60 dB over the operating frequency band 35-37 GHz. A very good correlation between the measured results and simulated results is observed.
international symposium on antennas and propagation | 2012
Wael M. Abdel-Wahab; Safieddin Safavi-Naeini
A simple low loss H-shape hybrid coupler based on the substrate integrated waveguide technology is presented for millimeter-wave applications. The coupler operation is based on the excitation of two different modes, TE10 and TE20. The coupler S-matrix is calculated by using a full-wave solver that uses the even/odd mode (symmetry) analysis to minimize the computational time and provides more physical insight. The simulated return and insertion losses are better than -20 dB and -3.90 dB, respectively over the operating frequency bandwidth of 39-40.50 GHz.
international symposium on antennas and propagation | 2011
Wael M. Abdel-Wahab; Safieddin Safavi-Naeini
This paper presents a novel double-layer hybrid branch line coupler (HBLC) design for millimeter-wave (mm-wave) antenna array applications. It is based upon the substrate integrated waveguide (SIW) technique, which is considered to be a low loss and low cost technology. The full-wave solver, HFSS, is used to simulate and optimize the proposed SIW-HBLC for minimum loss performance. The simulated results of the compact design are compared to these of the original (single layer) design presented in the literature. The SIW-HBLC shows a maximum −0.8 dB loss within an operating frequency band of 600 MHz around the center frequency 34.89 GHz.
IEEE Antennas and Wireless Propagation Letters | 2016
Mona Abdallah; Ying Wang; Wael M. Abdel-Wahab; Safieddin Safavi-Naeini
An efficient, accurate, and tunable circuit model is presented for modeling of the substrate integrated waveguide (SIW) series-fed dielectric resonator antenna (DRA) array. For much improved model flexibility, the mutual coupling between antenna elements is taken into account and represented by a fully adjustable model, allowing the design parameters to be varied. Development of the circuit model is straightforward. Only one or two antenna elements from the array need to be simulated with a full-wave solver. Furthermore, the model is applicable for antenna arrays with different numbers of elements. The circuit model enables efficient iterative design and optimization of antenna arrays. Millimeter-wave SIW series-fed DRA array examples are used to validate the model. The simulation results using the proposed circuit model agree well with the full-wave solver and measurement results.
international symposium on antennas and propagation | 2015
Al-Saedi Hussam; Fereidani Mohmmad; Wael M. Abdel-Wahab; Gholamreza Rafi; Safieddin Safavi-Naeini
A 4×4 circular polarized planar antenna array design is presented. It can be used as a building block for a large-scale Ka-band satellite communication phased array antenna. The array is easy to be fabricated and integrated with electronic devices (e.g. phase shifters). It shows high circular polarization purity (axial ratio less that 1dB at the range of 650MHz/29GHz) and the reflection coefficient of better than -19dB over a wide bandwidth of 17 %.
ieee antennas and propagation society international symposium | 2014
Mona Abdallah; Ying Wang; Wael M. Abdel-Wahab; Safieddin Safavi-Naeini; Jingping Liu
A simple circuit model is presented for modeling substrate integrated waveguide (SIW) series-fed dielectric resonator antenna (DRA) array. The mutual coupling between antenna elements is taken into account in the model. A single-element and a two-element antenna structures are simulated first using full-wave solver. The mutual coupling between antennas is then extracted and subsequently plugged into the circuit model for the antenna array. A millimeter-wave DRA array example is used to validate the model. The S-parameters calculated using the model agrees well with the full-wave solver results.