International Journal of Applied Electromagnetics and Mechanics - Volume 42, issue 4

Authors: Yuan, Zhong-Cai | Shi, Jia-Ming

Article Type: Research Article

Abstract: This paper presents numerical results in the form of graphs of the power reflection coefficients for electromagnetic signals normally incident upon a conductive plane covered with two layers of inhomogeneous plasma slabs. The plasma electron density varies only in the direction perpendicular to the plane. Parameters considered in the computation cover a relatively wide range and the functional dependence of the power reflection coefficients on these parameters is studied. The results indicate that in a rather …broad frequency range, the electromagnetic attenuations by the double slabs obviously excel the sum of attenuations resulted from two plasma layers when each layer exits respectively. The structure presented is easy to set up, which is instructive for plasma stealth. Show more

Keywords: Unmagnetized plasma, electromagnetic reflection, FDTD

DOI: 10.3233/JAE-131689

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 42, no. 4, pp. 623-628, 2013

Authors: Kakkar, Sushil | Rani, Shweta

Article Type: Research Article

Abstract: This paper presents an analysis and design of a novel planar antenna in corporation with fractal shaped defected ground structure (DGS) for wireless communication devoted to emergency management. The conventional ground plane can be replaced by a Fractal DGS ground plane to get size reduction, better efficiency and suppress surface-waves. The synthesis of proposed antenna is carried out by means of particle swarm optimization (PSO) to identify the geometrical descriptors of the structure. The representative results …reveals that the proposed geometry exhibit better impedance matching and multiband characteristics in comparison to conventional planar antenna (without any defects). The analyses from simulations, numerical and experimental validations are reported in order to illustrate the effectiveness of varying scale factor that contributes 69.08% size reduction of ground plane. Show more

Keywords: DGS, fractals, PSO

DOI: 10.3233/JAE-131690

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 42, no. 4, pp. 629-637, 2013

Authors: Shoukat, Sobia | Syed, Aqeel A. | Naqvi, Q.A.

Article Type: Research Article

Abstract: In this article, we investigate the reflection and transmission properties of a uniaxial chiral slab of infinite extent and placed in an isotropic chiral medium. The effect of polarization of the incident field and material parametric dependence of the reflected and transmitted power has been analyzed. The formulas for the reflected and transmitted power are derived and numerical results for various slab parameters are presented. It has been shown that the transmission or rejection of the …fields can be controlled by varying the material parameters of the slab. Show more

Keywords: Uniaxial chiral slab, chiral media, circular polarization

DOI: 10.3233/JAE-131691

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 42, no. 4, pp. 639-652, 2013

Authors: Chenniappan, Poongodi | Arumugam, Shanmugam

Article Type: Research Article

Abstract: A dual resonant G shaped and U shaped metamaterial structure with dipole antenna is designed, fabricated on FR4 substrate and measured using Agilent network analyzer. The metamaterial based loading creates additional resonance, so this proposed antenna effectively covers both 2.4 GHz and 5.8 GHz bands. The return losses of the measured results are in agreement with simulated results, the measured S parameters and simulated radiation pattern showed that the proposed design is suitable for WLAN frequency …regions. The measured return loss (S parameter) of G shaped metamaterial based dipole is −21.45 dB at 2.4 GHz and simulated return loss is −21.61 dB at 5.2 GHz. The measured return loss of U shaped metamaterial is −26.11 dB at 2.4 GHz and second simulated resonance frequency occurs at 5.8 GHz at the return loss value of −23.96 dB which is most suitable for wireless LAN application. Show more

Keywords: Printed dipole antenna, metamaterial, WLAN, substrate, gain, radiation pattern

DOI: 10.3233/JAE-131692

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 42, no. 4, pp. 653-661, 2013

Article Type: Other

Abstract: Author Index Volume 42 (2013)

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 42, no. 4, pp. 663-668, 2013