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Cairo, Egypt

Abdalla M.A.,MTC College | Ibrahim A.A.,Minia University
IEEE Antennas and Propagation Society, AP-S International Symposium (Digest) | Year: 2015

This paper presents design of multi-band asymmetric coplanar strip-fed metamaterial antenna. The proposed antenna exhibits three resonances at 5 GHz, 5.8 GHz and 6.3 GHz. The proposed antenna is designed using one left handed unit cell. Thanks to the asymmetric configuration, the introduced antenna has the advantage of compactness (its size is only 13.5×26.5 mm2). The design represents size reduction which can be considered better than 50% compared to conventional patch antennas operating at the same frequency. Details of the antenna design, simulation, and experimental results are presented and discussed. The proposed antenna demonstrates nearly omnidirectional radiation characteristics. The simulation results agree well with the measured results. The proposed configuration can be applied for much smaller size system applications. © 2015 IEEE. Source


Daw A.F.,University | El Rahman Abdallah M.A.,MTC College | El Hennawy H.M.,Ain Shams University
National Radio Science Conference, NRSC, Proceedings | Year: 2015

In this paper, a novel design of multi band (dual/quad) coupled gap transmission line resonators based on dual composite right/left handed microstrip structure is developed. The introduced structures demonstrate dual and quad resonances high selective sharpness passband response. The consummate structures was designed using one and two cells consist of a combination of a shunt tank related to interdigital capacitor and strip inductor, in addition to series tank intended using patch capacitor with small strip inductor. Furthermore, the paper elaborates the equivalent circuit model, analytical study, 3D full wave simulation and fabrication measurement results. The results manifest four sharp pass band resonances at 4 GHz, 5.8 GHz, 6.6 GHz, and 7.7 GHz with transmission coefficients equal -0.69 dB, -1.9 dB, -3.9 dB, and -3.7 dB, respectively. The quality factor demonstrates very high selectivity and equals 75.75, 151.75, 125, and 82.7 at the four bands, respectively. © 2015 IEEE. Source


Zahran S.R.,Arab Academy for Science and Technology | Abdalla M.A.,MTC College
IEEE Antennas and Propagation Society, AP-S International Symposium (Digest) | Year: 2015

In this paper a novel flexible and compact Ultra Wide Band is presented. The proposed antenna is made using a 0.1 mm thick flexible substrate with size 75 × 18 mm2. The proposed antenna can serve as a wearable human hand-band for UWB applications. The almost typical radiation pattern with moderate gain is preserved over the operating bandwidth. The design principles of the proposed antenna along with the full wave simulations and experimental measurements are presented. Good agreement between simulated and measured results is achieved. © 2015 IEEE. Source


Abdalla M.A.,MTC College | Ibrahim A.A.,Minia University | El-Azeem M.H.A.,Arab Academy for Science and Technology
Progress In Electromagnetics Research C | Year: 2015

In this paper, a nonlinear phase enhancement of multi-resonance composite right/lefthanded unit cell for multi-band antennas is presented. Different antennas with nonlinear enhanced phase which can operate up to five different frequency bands are introduced. Meanwhile, the proposed antennas have compact size so that they can demonstrate size reduction up to 60% compared to conventional patch antennas operating at the same frequencies. The achieved phase enhancement has been validated by comparing two different configurations of composite right/left-handed cells. The analysis, electromagnetic full wave simulations and experimental results are discussed. A reasonable agreement is achieved between the measured and simulated results. © 2015, Electromagnetics Academy. All rights reserved. Source


Ibrahim A.A.,Minia University | Abdalla M.A.,MTC College
AEU - International Journal of Electronics and Communications | Year: 2016

A design of CRLH MIMO metamaterial with reversal CRLH configuration antenna is presented. The two antenna elements are designed to operate at 5.8GHz for wireless applications. The two antenna elements are designed using reversed one left handed unit cell for high mutual coupling isolation in close separation. The two elements of MIMO antenna are put together with very small separation between them where the distance between the edges of two antenna elements is only 0.034 λ 0. The MIMO antenna has compact size (its size is only 2.93 × 2.6cm2). The designed antenna elements have better than 35dB coupling isolation between the two inputs without using extra structures. The performance of MIMO antennas is evaluated by studying the correlation coefficient, diversity gain and total active reflection coefficient. A good agreement is achieved between simulation and measured results. © 2016 Elsevier GmbH. Source

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