Browsing by Author "El Atrash M."
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Item A circularly polarised antenna for a wireless blood-flow sensor(Institute of Electrical and Electronics Engineers Inc., 2015) El Atrash M.; Wang Y.; School of Electrical Communication and Electronics Systems Engineering; October University for Modern Science and Arts University; Wahat Road; 6 October City; Cairo; Egypt; University of Greenwich; Kent; ME4 4TB; United KingdomThis paper presents a circularly polarised antenna for determining the speed of blood-flow, using Doppler effects at microwave frequencies. The structure consists of a double-feed patch antenna and a quadrature hybrid coupler in order to achieve circular polarisation and to isolate the reflected signal from the incident. The design was simulated and then fabricated. Both results were compared which showed a good agreement in terms of scattering parameters and radiation patterns. 2014 IEEE.Item A compact dual-band flexible CPW-fed antenna for wearable applications(Institute of Electrical and Electronics Engineers Inc., 2017) El Atrash M.; Bassem K.; Abdalla M.A.; Electrical Systems Engineering Department; October University for Modern Sciences and Arts (MSA); Cairo; Egypt; Electromagnetic Fields Group; Electronic Eng. Dep.; MTC College; Cairo; EgyptThis paper presents a compact, dual-band, flexible, Co-Planar Waveguide (CPW)-fed antenna. The compact size is achieved by employing meander line technique. The antenna is implemented on a flexible substrate, Gil GML 1034; thus, it is appropriate to be realized for wearable applications. Dual-band is attained at 2.4 GHz of the ISM Band and 5.2 GHz, respectively. Hence, serving the Radio Frequency Identification (RFID) and Wireless Local Area Network (WLAN) applications. � 2017 IEEE.Item Gain enhancement of a compact thin flexible reflector-based asymmetric meander line antenna with low SAR(Institution of Engineering and Technology, 2019) El Atrash M.; Abdalla M.A.; Elhennawy H.M.; Department of Electrical Systems Engineering; October University for Modern Sciences and Arts; 26 July Mehwar Road intersection with Wahat Road; 6th October City; Egypt; Department of Electronic Engineering; Military Technical College; El-Qobba Bridge; Al Waili; Cairo; Egypt; Department of Electronics and Communications; Ain Shams University; Abbasseya; Cairo; EgyptA compact, flexible, coplanar waveguide-fed, U-shaped reflector surrounded asymmetric meander line antenna operating at 2.4.GHz is presented for wrist wearable applications. The antenna is printed on flexible Rogers Ultralam 3850 substrate. Size reduction of 67.7% was attained by employing the meandering methodology, in comparison with the printed straight monopole. The design displays a gain of around 3.dB by incorporating a U-shaped reflector, on the same level as the radiator, which is considered as the main contribution of the proposed design. Bending scenarios were studied proving the antenna robustness against bending. The proposed antenna was bent over a human body model with optimum separation distance, where enhancement of the specific absorption rate (SAR) level has been achieved, compared to the symmetric meander line antenna. The antenna was fabricated and measured where a high agreement was met in terms of simulated and measured return loss and radiation pattern polar plots, as well as, simulated and measured gain. � The Institution of Engineering and Technology.Item A low profile flexible circularly polarized antenna for wearable and WLAN applications(Springer Verlag, 2019) Ali A.M.; El Atrash M.; Zahran S.R.; Abdalla M.A.; MSA University; Electrical Systems Eng. Department; Cairo; Egypt; Arab Academy for Science and Technology; Comm. and Elect. Engineering Dep.; Cairo; Egypt; MTC College; Electronic Engineering Department; Cairo; EgyptA low profile, flexible, circularly polarized antenna based on the artificial material methodology is introduced in this paper. The antenna footprint is 20 mm � 15 mm, where it is excited by the Co-Planar Waveguide (CPW) configuration. Flexibility is achieved by incorporating Rogers Ultralam 3850 as the antenna substrate. By protruding an inverted T-shaped slot from the radiator to the extended CPW ground plane, circular polarization was achieved. The design radiates at 5.2 GHz with a-10 dB bandwidth of 29.7 MHz, gain of 0.7 dBic, boresight Axial Ratio (AR) of 0.86 dB, and 3 dB-AR bandwidth of 64.3 MHz. With such characteristics, the antenna is targeting wearable and Wireless Local Area Network (WLAN) applications. 2019 IEEE.Item An Ultra-Thin Compact Highly Efficient Π-Section CRLH–EBG Based Antenna for ISM Applications(Institute of Electrical and Electronics Engineers Inc., 2019) Abdalla M.A.; El Atrash M.; Aboelabas A.A.; Abd-Alwahab S.S.; Military Technical College; Electromagnetic Fields Group; Cairo; Egypt; October University for Modern Sciences and Arts (MSA); Electrical Systems Engineering Department; Cairo; EgyptAn ultra-thin, compact, highly efficient, antenna based on the ?-section Composite Right/ Left-Handed (CRLH) methodology backed with a 2. 2 Electromagnetic Band-Gap (EBG) array is presented in this paper. The integrated design operates at 2.45 GHz of the ISM Band with simulated gain and total efficiency of 7.63 dBi and 94.6 %, respectively. Moreover, the antenna is printed over 100 ?m flexible substrate while the EBG is printed on 0.8 mm substrate which makes the whole structure low profile. With such results, the integrated design is highly recommended for wearable applications. Results are achieved through circuit model and full wave electromagnetic simulations. 2019 IEEE.