MTC College

Cairo, Egypt

MTC College

Cairo, Egypt
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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 | Abdelraheem A.M.,MTC College
IET Microwaves, Antennas and Propagation | Year: 2017

This study presents a hybrid electromagnetic isolation mechanism in a transceiver array antenna operating at 5.8 GHz. Maximum isolation between transmitting and receiving array antennas, at a very close spacing (3 mm = 0.058λ0), and minimum mutual coupling between each array elements is achieved without antenna radiation pattern degradation. The achieved separation is equivalent to 44% size reduction compared with conventional half wavelength spacing criterion. Each of the transmitting and receiving array antennas is a four-element linear microstrip patch array antenna. The employed hybrid isolation technique is composed of defected ground structure, to minimise coupling between array elements, and uniplanar electromagnetic bandgap, to minimise the coupling between the transmitting and receiving antennas. The resulting transceiver array antenna system fulfils -35 dB mutual coupling between array elements, and 60 dB isolation between opponent transmitting and receiving array antennas. The proposed design procedures are discussed and analysed using electromagnetic full wave simulations. Results were verified through experimental measurements for reflection coefficient, mutual coupling and radiation characteristics in which a good agreement with simulated results is granted. © The Institution of Engineering and Technology.

Abdalla M.A.,MTC College
Microwave and Optical Technology Letters | Year: 2017

This paper discusses the properties of hybrid terminated metamaterial CRLH resonant antennas. The antenna proves that the hybrid termination can increase the electrical length of based antennas and hence it can increase the number of possible frequency bands at compact size. This is emphasized through developing a dual band hybrid termination CRLH cell antenna resonating at 2.4 GHz and 5.2 GHz. The antenna design and performance is compared to open/short circuit termination CRLH resonant antennas. All the discussed antennas in this paper have same compact size (21 × 31 mm2). An experimental measurements are carried out for the hybrid terminated CRLH resonant antenna as further validation. The proposed antenna can find possible applications in WiFi/WiMAX services. © 2017 Wiley Periodicals, Inc.

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.

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