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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 | 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.


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.


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
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.

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