Browsing by Author "Ali, Mohamed Mamdouh M."

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Citation - WoS: 3
Citation - Scopus: 5
Interfacing Wideband Amplifiers Using Ridge Gap Waveguide for Mm-Wave Systems
(Institute of Electrical and Electronics Engineers Inc., 2020) Shams S.I.; Ali M.M.M.; Sebak A.; Elsaadany M.; Gagnon G.; Fawzy D.E.; Allam A.M.M.A.; Fawzy, Diaa E.; Gagnon, Ghyslain; Allam, A.M.M.A.; Sebak, Abdelrazik; Elsaadany, Mahmoud; Shams, Shoukry I.; Ali, Mohamed Mamdouh M.
The 6G race has already begun, and many countries and giant corporations started directing significant efforts and funds towards the development of the future technology. The 6G standard is expected to migrate to higher bands of frequencies to support wider bandwidth. Through this wide bandwidth, it will be feasible to serve the expected massive number of users and future applications, such as virtual reality and HD realtime transmission. One major problem in high frequency ranges, such as mm-wave bands, is the high signal attenuation, which can be compensated through more efficient amplifier systems. In this paper, we propose a wideband amplifier design fed through a Ridge Gap Waveguide line. The proposed design has many advantages inherited from the host guiding structure. The signal is carried by a Quasi-TEM signal, which minimizes the signal distortion. Also, the structure acts as a large heat sink, which minimizes the operating temperature. As a result, the expected added noise by the proposed amplifier shall be minimal. © 2020 IEEE.
Citation - WoS: 2
Citation - Scopus: 3
On the Design of Reconfigurable Wideband Ridge Gap Waveguide Amplifier Modules
(IEEE, 2020) Elsaadany, Mahmoud; Shams, Shoukry, I; Ali, Mohamed Mamdouh M.; Sebak, Abdelrazik; Gagnon, Ghyslain; Fawzy, Diaa E.; Allam, A. M. M. A.
The near-to-launch 5G standard for wireless communications did not seal the ultimate use the mm-wave bands. As a result, the future 6G standard is expected to proceed in more efficient utilization of these bands. One of the most critical elements in the RF link is the amplifier, especially when the attenuation of the channel is relatively high which is the case for the mm-wave bands. In this work, a reconfigurable design of a wideband amplifier is presented to operate in the band 34 GHz to 38 GHz. The line parameters are investigated to study the tune-ability of this configuration. In particular, changing the parasitic loading by varying lines width can achieve a matching level beyond 15 dB over partial band operations based on the configuration. The availability of such a reconfigurable module will pave the way for efficient 6G development.
On the Design of Reconfigurable Wideband Ridge Gap Waveguide Amplifier Modules
(Institute of Electrical and Electronics Engineers Inc., 2020) Fawzy, Diaa E.; Gagnon, Ghyslain; Allam, A.M.M.A.; Elsaadany, Mahmoud; Sebak, Abdelrazik; Shams, Shoukry I.; Ali, Mohamed Mamdouh M.
Citation - WoS: 5
Citation - Scopus: 12
Ridge Gap Waveguide Wideband Hybrid Directional Coupler for Ka-Band Applications
(IEEE, 2020) Soliman, Mohamed Yasser; Ali, Mohamed Mamdouh M.; Shams, Shoukry, I; Sree, Mohamed Fathy Abo; Fawzy, Diaa E.; Allam, A. M. M. A.
The fifth generation (5G) is the next wireless mobile communication technology that targets to provide huge capacity, low latency and high data speeds. Like any new wireless technology, 5G requires the development of exciting techniques, where access to high frequency spectrum can achieve the desired characteristics. In addition, new systems must be developed and designed using wide bandwidth microwave components, which should be implemented with modern and efficient guiding structures. Among all the microwave components, directional coupler is essential device as it can be used to realize many subsystems such as beamforming networks. In order to keep up with the huge changes in future technologies, couplers still requires noticeable improvement, where wide bandwidth and low loss should be achieved throughout using modern guiding technology such as Ridge Gap Waveguide (RGW). In this paper, a design of ultra-wideband 3 dB quadrature hybrid directional coupler using RGW technology is introduced. The proposed coupler has a compact size of 1.58 lambda x 1.4 lambda and achieves a relative bandwidth of 44.7 % at 33.5 GHz, which cover the whole ka-band. In addition, a stable 90 degrees phase difference between the coupling and transmission coefficients is obtained over the whole frequency band.