Browsing by Author "Elhennawy H.M."

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Compact dual wide band D-CRLH three way power divider
(Institute of Electrical and Electronics Engineers Inc., 2016) Daw A.F.; Abdalla M.A.; Elhennawy H.M.; Communication and Electronics Dept; MSA University; Cairo; Egypt; Electronic Engineering Dept; MTC Collage; Cairo; Egypt; Electronics and Communications Dept; Ain Shams University; Cairo; Egypt
A compact dual ultra-wide band power dividers based on three cells of dual composite right/left handed microstrip structure presented in this article. This introduced topology proposes dual band for multiband orthogonal frequency division multiplexing from 1 GHz-4.8 GHz with insertion loss -5 dB for three way power divider. The second band designed for direct sequence ultra-wideband from 6.2 GHz-9.5 GHz with insertion loss -5.2 dB for the divider. The rejection band extended from 5 to 5.8 GHz is introduces to avoid the interference between WLAN and UWB applications. The article elaborates the equivalent circuit model, analytical study, 3D full wave simulation and fabrication measurement results. Furthermore, the design realizes compactness size 45.37 % over conventional T-junction power divider, and also, realizes compactness size 30.05 % over the most recently compact dividers. 2016 IEEE.
Dual band high selective compact transmission line gap resonator
(Institute of Electrical and Electronics Engineers Inc., 2014) Daw A.F.; Abdalla M.A.; Elhennawy H.M.; Communication and Electronics Dept; MSA University; Cairo; Egypt; Electronic Engineering Dept; MTC Collage; Cairo; Egypt; Electronics and Communications Dept; Ain Shams University; Cairo; Egypt
This paper presents, for the first time, a coupled gap transmission line resonator based on dual composite right/left handed microstrip structure. This introduced topology proposes dual band with high selective sharp band pass response. The whole structure is designed using only one cell comprised using a shunt tank of interdigital capacitor and strip inductor, and series tank formed using patch capacitor with small strip inductor. Moreover, the paper elaborates the equivalent circuit model, analytical study, 3D full wave simulation and fabrication measurement results. The results exhibit two sharp insertion loss resonances at 5.8 GHz and 7.7 GHz with associated return loses better than 10 dB. Furthermore, the quality factor demonstrates very high selectivity and equals 194.3 and 142.3 at the two bands, respectively. � 2014 IEEE.
Dual-band divider has rejection band at 5 GHz
(Penton Publishing Co., 2016) Daw A.F.; Abdalla M.A.; Elhennawy H.M.; Communication and Electronics Department; Faculty of Engineering; MSA University; Cairo; Egypt; Electronic Engineering Department; MTC College; Cairo; Egypt; Electronics and Communication Department; Ain Shams University; Cairo; Egypt
[No abstract available]
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; Egypt
A 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.
New configuration for multiband ultra compact gap resonator based D-CRLH
(Institute of Electrical and Electronics Engineers Inc., 2016) Daw A.F.; Abdalla M.A.; Elhennawy H.M.; Communication and Electronics Dept; MSA University; Cairo; Egypt; Electronic Engineering Dept; MTC Collage; Cairo; Egypt; Electronics and Communications Dept; Ain Shams University; Cairo; Egypt
A new compact multiband resonator based on one modified cell of dual-composite right/left-handed microstrip structure is presented in this paper. This introduced topology proposes triple band for 7.4 GHz, 9.2 GHz, and 13 GHz with insertion loss 2.3 dB, 0.6 dB, and 0.55 dB, respectively. Moreover, the return losses are equal 13 dB, 43 dB, and 10 dB, respectively. The paper elaborates the equivalent circuit model, analytical study and 3D full-wave simulation. Furthermore, the design realizes compactness size (13.2 � 5.9 mm2). The quality factor demonstrates selectivity equals 35, 8.18, and 48.1 at the four bands, respectively. � 2016 IEEE.
New inductor loaded composite right left hand impedance transformer for UWB wireless applications
(Institute of Electrical and Electronics Engineers Inc., 2015) Daw A.F.; Abdalla M.A.; Elhennawy H.M.; MSA University; Communications and Electronics Dept; Cairo; Egypt; MTC Collage; Electronic Engineering Dept.; Cairo; Egypt; Ain Shams University; Electronics and Communications Dept.; Cairo; Egypt
A compact ultra wide band impedances transformer based on new configuration of composite right/left handed transmission line is presented. The proposed design introduces ultra wide band pass frequencies extended from 2 GHz up to 11 GHz with perfect matching transmission coefficient. However, the whole topology is designed using new loaded inductor configuration of CRLH. This L-CRLH is implemented using loaded inductor to construct shunt tank of gap capacitor and strip inductor, and shunt tank formed using patch capacitor with shorted strip inductor. Furthermore, the paper present analytical study, equivalent circuit model, 3D fall wave simulation and fabrication measurement results. The results shows perfect insertion losses equal 0.2 dB and return losses reach to 19 dB within extended band pass band from 2 GHz up to 11 GHz. Moreover, it introduces very compact size equal 2.7�8.6 mm2 (58% size reduction compared to single frequency ?/4 transformer) � 2015 IEEE.