Electromagnetic Fields Group

Cairo, Egypt

Electromagnetic Fields Group

Cairo, Egypt
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Abdalla M.A.,Electromagnetic Fields Group | Abo El-Dahab M.,Arab Academy for Science and Technology | Ghouz M.H.,Arab Academy for Science and Technology
IEEE Antennas and Propagation Society, AP-S International Symposium (Digest) | Year: 2015

In this paper, a new printed dipole antenna loaded with double periodic cells of composite right left handed transmission line is presented. The double periodic structure is inserted at the end of the dipole as an open circuit quarter wavelength steeped impedance resonator for additional filtering function. The proposed antenna performance is compared to a reference unloaded dipole and a loaded dipole with two symmetric cells. The proposed antennas have been validated using full wave simulation. The results confirm that the proposed antenna has dual band at (1.55 GHz & 1.9 GHz) with stopband filtering up to 5 GHz. Compared to other reference dipole, it is only single band whereas the two identical cells loaded dipole has multiband; mainly at 1.1 GHz, 1.8 GHz, 2.4 GHz & 3.6 GHz but without filtering option. The proposed antenna has a good efficiency that can be applied in wireless services. © 2015 IEEE.


Wahba W.,Electromagnetic Fields Group | Abdalla M.A.,Electromagnetic Fields Group | Allam A.M.M.,German University in Cairo
Progress In Electromagnetics Research C | Year: 2016

This paper presents a zeroth order metamaterial substrate integrated waveguide antenna. The antenna is designed to have a compact size based on employing only one composite right/lefthanded cell. The antenna resonates at 6.1GHz with overall radiator size of 14.4mm × 8mm which represents 50% size reduction compared to conventional microstrip patch antenna that operates at the same frequency. The zeroth order mode of the antenna has been verified using analytical explanation and full wave simulations. Moreover, the full wave simulations and experimental measurements have been employed to confirm the antenna matching properties and radiation characteristics. © 2016, Electromagnetics Academy. All rights reserved.


Abdalla M.A.,Electromagnetic Fields Group | Fouad A.,Electromagnetic Fields Group
IEEE Antennas and Propagation Society, AP-S International Symposium (Digest) | Year: 2015

This paper presents an ultra-compact triple band metamaterial antenna formed from only one cell of dual composite right left handed transmission line. The proposed configuration is simple as it does not need via connection. The antenna is operating at 1.57 GHz, 2.65 GHz and 3.7 GHz. The antenna size is only 18×26 mm2. Compared to conventional microstrip patch antenna, the proposed antenna size is only 3%, 9%, and 15%. at the former frequencies, respectively. The design concepts, the electromagnetic full wave simulation validation and the experimental results are introduced. Very good agreements between the simulated and measured results. © 2015 IEEE.


Abdalla M.A.,Electromagnetic Fields Group | Sadek F.,Cairo University
IEEE Antennas and Propagation Society, AP-S International Symposium (Digest) | Year: 2015

This paper introduces a new hybrid termination of composite right left handed antenna. The hybrid termination if formed by short circuit loading coupled to open loading through air gap capacitor. A novel antenna operates at 2.4 GHz and 5.2 GHz with antenna dimensions 21×30 mm2 (only 9% compared to conventional microstrip antenna). The proposed new termination has resulted in increasing the electrical length of the open circuit composite right left handed antenna by 20%. for the same physical dimensions. The proposed antenna theoretical concepts is explained. The antenna performance is validated by full wave simulation and experimental measurements. © 2015 IEEE.


Abdalla M.A.,Electromagnetic Fields Group | Fouad M.A.,Electromagnetic Fields Group
Progress In Electromagnetics Research C | Year: 2016

In this paper, an ultra compact dual-band metamaterial antenna based on a new asymmetric generalized negative refractive index transmission line is introduced. The antenna was designed to support the 900MHz GSM and 2400 RFID/WiFi bands. Moreover, the antenna size is only (15 × 20mm2) which is less than (0.08λg × 0.1λg) at the center frequency of the first resonance and (0.22λg × 0.29λg) at the center frequency of the second resonance. The theoretical design steps of the antenna are explained. The dual-band antenna design has been validated using equivalent circuit modelling, electromagnetic full wave simulations and practical measurement. The results illustrate that the antenna has the first resonance centred at 0.9GHz and the second at 2.4GHz with 15 dB return loss in the two bands. Good agreements among the circuit modelling, electromagnetic full wave simulation and practical measurements have been achieved. © 2016, Electromagnetics Academy. All right reserved.


Abdalla M.A.,Electromagnetic Fields Group | Fouad A.,Electromagnetic Fields Group
Progress In Electromagnetics Research C | Year: 2016

This paper presents an ultra-compact filtering integrated antenna for GPS (1.57 GHz) and LTE (2.65 GHz) applications. The antenna comprises integration between dual composite right/left-handed antenna and bandstop filter in one platform. The whole integrated antenna size is only 30 × 28.5mm2. Compared to conventional antenna with the same dimensions, the proposed antenna is only 6.5% at GPS band and 16.5% at LTE band. The deign procedures of individual antennas, bandstop filter and the filtering integrated antennas are explained in details. The full wave simulations supporting the design procedures and experimental measurements for all introduced components are introduced with good agreement. Finally, as a consequence of the proposed antenna ultra small size and its filtering capability, the antenna is a good candidate for implanted antenna applications. © 2016, Electromagnetics Academy. All rights reserved.


Fouad M.A.,Electromagnetic Fields Group | Abdalla M.A.,Electromagnetic Fields Group
IET Microwaves, Antennas and Propagation | Year: 2014

This study presents, for the first time, a novel Π - T generalised negative refractive index (NRI) transmission line (TL) configuration. It is innovated for increasing the possible passbands in designing microwave components. It is proved that the proposed transmission line can introduce up to seven passbands for completely unbalanced transmission line condition. The detailed mathematical analysis of that configuration based on the periodic network analysis and equivalent circuit model is introduced. As an application for the novel Π - T generalised NRI TL configuration, a new compact triple band coplanar waveguide (CPW) metamaterial filter is introduced. The proposed triple bands CPW filter design steps are introduced and its performance is validated using equivalent circuit model simulation, electromagnetic full wave simulation and experimental measurements. Good agreements between the circuit modelling, electromagnetic full wave simulation and practical measurement results are achieved. All the results confirm that the proposed filter has triple passbands from 900 to 960 MHz, 1.4 to 1.48 GHz and 2.4 to 2.45 GHz. Moreover the filter size is compact whose length is only 12.1% λg at first passbands, 18.2 λg% at second passbands and 31.7 λg% at third passbands. © The Institution of Engineering and Technology 2014.


Hagag M.A.F.,Electromagnetic Fields Group | Abdalla M.A.,Electromagnetic Fields Group
Journal of Electromagnetic Waves and Applications | Year: 2015

This paper presents an ultra compact dual-band coplanar waveguide metamaterial filter based on generalized metamaterial transmission line. The detailed theoretical design steps of the filter are explained. The dual-band filter design performance has been validated using equivalent circuit modeling, electromagnetic full wave simulations, and practical measurement. The results illustrate the filter has dual passbands centered at 0.82 and 1.48 GHz with approximately 1 dB insertion loss and minimum 12 dB return loss. Good agreements between the circuit modeling, electromagnetic full wave simulations, and practical measurements are achieved. Moreover, the filter size is only (18 × 28 mm2) which is only less than (0.2gλ × 0.31gλ at the center frequency of the first passband and (0.36gλ × 0.56gλ at the center frequency of the second passband. © 2015 © 2015 Taylor & Francis.


Abdalla M.A.,Electromagnetic Fields Group | Awad A.A.,Cairo University | Hassan K.M.,Cairo University
2014 Loughborough Antennas and Propagation Conference, LAPC 2014 | Year: 2014

This paper presents a new compact, wide band and high selective, metamaterial antenna for 2 GHz wireless applications. The proposed antenna is designed using metamaterial half wave length stepped impedance resonator. The antenna is centred at 2.1 GHz with 21% fractional bandwidth and wide/high selective harmonics rejection in the frequencies up to 4 GHz. The antenna's radiator length is 18 mm which introduces 50% length reduction compared to narrow band microstrip patch antenna. The design procedures of the proposed antenna are discussed. The antenna's performance is examined in terms of full wave simulation and experimental measurements. © 2014 IEEE.

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