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Ibrahim A.A.,Minia University | Abdalla M.A.,MTC College | Boutejdar A.,German Research Foundation DFG
Progress In Electromagnetics Research M | Year: 2017

An octagonal shape monopole antenna with dual band-notched features used for ultra-wide band applications is presented. The monopole antenna has good impedance matching from 3.4 GHz to 12 GHz. The dual notched bands are achieved by using a U-shaped parasitic strip and meandered slot etched in the radiating patch. The first band notched is achieved using meandered slot to reduce the interference with WIMAX from 3.3 to 3.9 GHz. The second band notched is achieved using a U-shaped parasitic strip placed above the ground plane to eliminate the interference with WLAN from 5.2 GHz to 5.9 GHz. The proposed antenna is designed, simulated and measured. The measured result shows that the antenna structure achieves (VSWR < 2) from 3.2 to 10.8 GHz. Also, the simulated radiation pattern and current distribution at different frequencies are presented. The measured and simulated results confirm that the proposed antenna is suitable for UWB applications. © 2017, Electromagnetics Academy. All rights reserved.


Abdalla M.A.,MTC College | Hu Z.,University of Manchester
2016 IEEE Middle East Conference on Antennas and Propagation, MECAP 2016 | Year: 2016

This paper is composed of two parts. First, we explain the basic concepts of general composite right / left handed transmission line designs using ferrite medium. We explain its different analysis unlike conventional dielectric case. Hence, the ferrite left handed transmission line properties are emphasized compared to dielectric one. Second, we present some novel microwave device applications based on ferrite left handed transmission lines. The theories of these devices are based on the concepts introduced in the first part. These applications comprise quarter wavelength transformers and zeroth order resonator. Such applications have the advantages of compact size in addition to the tunability properties. Moreover, the proposed devices require small DC magnetic bias. © 2016 IEEE.


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.


Abdalla M.A.,MTC College | Sadek F.H.,MSA University
2015 9th International Congress on Advanced Electromagnetic Materials in Microwaves and Optics, METAMATERIALS 2015 | Year: 2015

This paper introduces a new compact triple band left handed antenna. Applying a composite right left handed transmission line, and open circuit termination load, the antenna operates at triple band frequencies, 1.8 GHz, 3.5 GHz and 5.8 GHz with total size 21×25 mm2 (only 27% compared to conventional microstrip antenna). A compromise between the proposed antenna's compact size and efficiency is made, as a result the antenna provides a maximum directive gain equals 1.37 dB, 2.76 dB and 3.61 dB, respectively. The proposed antenna can serve WiMAX and GSM applications efficiently. The antenna performance is validated by full wave simulation and experimental measurements. © 2015 IEEE.


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.


Abdalla M.A.,MTC College | Ibrahim A.A.,Minia University
Wireless Personal Communications | Year: 2016

This paper presents very close and high isolation composite right left handed transmission line MIMO antennas. The MIMO antennas consist of two elements each operates at 5.8 GHz for wireless applications. The two antenna elements are designed using one composite right left handed unit cell separated by only 0.034 λ0. The reduction of mutual coupling between the two antenna elements depends on current reversal between two antenna elements. The proposed MIMO antennas have the advantage of compactness (its size is only 3 × 2.6 cm2). In order to evaluate the performance of MIMO antennas, analysis of mutual coupling, correlation coefficient, diversity gain and total active reflection coefficient are presented. The proposed antennas can achieve isolation = 45 dB and envelope correlation = 0.0002 at 5.8 GHz. The simulated results are confirmed by the measurement results. © 2016 Springer Science+Business Media New York


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.


Fouad A.,MTC College | Abdalla M.A.,MTC College
National Radio Science Conference, NRSC, Proceedings | Year: 2015

This paper presents two different types with compact triple band metamaterial antennas for GSM (900 MHz), GPS (1.25 GHz & 1.5 GHz), and WiFi (2.4 GHz) applications. Two proposed antennas were proposed based on using integration of a rectangular patch antenna with two different metamaterial cells. The design has been carried out, validated by full wave simulations and confirmed by measurements. The results confirm that the two introduced antennas has triple bands operation with return loss better than 10 dB at each operating band. Good agreement between the simulated and measured results is achieved. The second proposed antenna size been reduced by 25% and 15% decrease in the operating frequency compared to the first one. The analysis, design concepts, full wave simulations and experimental results are introduced for the two proposed antennas. © 2015 IEEE.


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

This paper introduces a high order defected ground filter. The proposed filter has been applied for mutual coupling reduction of two element integrated transmit-receive antennas operating at 5.8 GHz. The proposed filter consists of six order rectangular defected ground structure to be inserted between the transmitter and receiver antennas with a separation distance of only 10 mm (0.2λ0). The proposed high order filter has reduced the mutual coupling by better than 20 dB compared to the case of non-using the filters. The theoretical principles and full wave simulations are introduced. Finally the experimental measurements have validated these results. Good agreements between the results are achieved. © 2015 IEEE.


Abdelraheem A.M.,MTC College | Abdalla M.A.,MTC College
National Radio Science Conference, NRSC, Proceedings | Year: 2014

In this paper, the prediction of electromagnetic propagation coverage of WiMAX base station over irregular terrain locations is presented. Investigation is performed for WiMAX base station in plain, heavy, and medium terrain locations at different directions surrounding the base station located in Sharm-Al-Shiekh city. Calculations are conducted employing the well-known Longley-Rice propagation model. The theoretical calculation concepts of the employed electromagnetic propagation model are discussed. The predicted coverage employing Longley-Rice model was compared to the predicted coverage employing the basic typical free space model, which accounts only for free space loss, at two different altitudes of the possible receiver, 2m, and 30m. 29km beyond LOS communication was found to be possible in directions of plain terrain as predicted by Longley-Rice model, however, many blind zones appeared inside the circle of the free space model in the directions of medium and heavy terrains. For better visual insight, results (predicted coverage) were presented over colorful Google-Maps with 90m resolution. © 2014 IEEE.

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