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Publisher: Advanced Electromagnetics   (Total: 1 journals)   [Sort by number of followers]

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Advanced Electromagnetics     Open Access   (Followers: 16, SJR: 0.154, CiteScore: 1)
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Advanced Electromagnetics
Journal Prestige (SJR): 0.154
Citation Impact (citeScore): 1
Number of Followers: 16  

  This is an Open Access Journal Open Access journal
ISSN (Online) 2119-0275
Published by Advanced Electromagnetics Homepage  [1 journal]
  • The Conversion of Excitation Energy into Generated Energy at the Resonant
           Frequencies of a Transparent Nonlinear Layer

    • Authors: L. Angermann; V. V. Yatsyk, Mykola V. Yatsyk
      Abstract: An iterative algorithm is presented for analyzing the optimal resonant radiation properties of electromagnetic waves by cubically polarized nonlinear layers. The analysis is based on mathematical models for the rigorous treatment of the following problems: Self-consistent solution of both the system of boundary value problems of electrodynamics at resonant frequencies of excitation and generation, as well as the corresponding linearized eigenvalue problems with induced dielectric coefficients. The choice of the resonant excitation frequency of a nonlinear object in dependence on the real parts of the eigen frequencies of the spectral problems is discussed.
      PubDate: Fri, 17 May 2019 15:26:03 -040
       
  • Study of Stacked High Tc Superconducting Circular Disk Microstrip Antenna
           in Multilayered Substrate Containing Isotropic and/or Uniaxial Anisotropic
           Materials

    • Authors: A. S. Boughrara; S. Benkouda, A. Bouraiou, T. Fortaki
      Abstract: In this paper, we present a rigorous full-wave analysis able to estimate exactly the resonant characteristics of stacked high Tc superconducting circular disk microstrip antenna. The superconducting patches are assumed to be embedded in a multilayered substrate containing isotropic and/or uniaxial anisotropic materials (the analysis is valid for an arbitrary number of layers). London’s equations and the two-fluid model of Gorter and Casimir are used in the calculation of the complex surface impedance of the superconducting circular disks. Numerical results are presented for a single layer structure as well as for two stacked circular disks fabricated on a double-layered substrate.
      PubDate: Thu, 16 May 2019 15:14:38 -040
       
  • Wavelet Based Denoising of the Simulated Chest Wall Motion Detected by
           SFCW Radar

    • Authors: Y. E. Acar; I. Seflek, E. Yaldız
      Abstract: Low power and compact radars have emerged with the development of electronic technology. This has enabled the use of radars in indoor environments and the realization of many applications. The detection, tracking and classification of human movements by radar are among the remarkable applications. Contactless detection of human vital signs improves the quality of life of patients being kept under observation and facilitates the work of experts. In this study, it was simulated that the movement of the chest wall was modeled and detected by the SFCW radar. Gaussian, Rician and uniformly distributed random noise types were added to the modeled chest motion at different levels. The noisy signal obtained at the receiver is denoised with different mother wavelet functions and the performances of these functions are presented comparatively.
      PubDate: Wed, 15 May 2019 05:48:05 -040
       
  • Polarimetric Parameters of Scattered Radiation in the Magnetized Plasma

    • Authors: George Jandieri; Akira Ishimaru, Jaromir Pistora, Michal Lesnak
      Abstract: Second order statistical moments of scattered electromagnetic waves in the turbulent magnetized plasma slab with electron density fluctuations are calculated applying the modify stochastic smooth perturbation theory and the boundary conditions. The obtained results are valid for arbitrary correlation function of electron density fluctuations. Stokes parameters are analyzed both analytically and numerically. The theory predicts that depolarization effect caused by second Stokes parameter may be important in scintillation effects. Numerical calculations are carried out for new spectral function of electron density fluctuations containing both anisotropic Gaussian and power-law spectral functions using the experimental data. Polarimetric parameters are calculated for different anisotropy factor and inclination angle of elongated small-scale irregularities with respect to the magnetic lines of forces. The relationship between the scintillations and the polarimetric parameters is important.
      PubDate: Tue, 14 May 2019 07:43:48 -040
       
  • Design and Characterization of a Compact Single Layer Modified S-Shaped
           Tag Antenna for UHF-RFID Applications

    • Authors: M. A. Ennasar; I. Aznabet, O. EL Mrabet, M. Essaaidi
      Abstract: In this paper, we report the design of a new compact single layer modified S-shaped tag antenna for UHF-RFID applications. To achieve a compact size of 51×34 mm2 for this tag antenna, the technique of using S shaped strip is applied, and by further adding a pair of equilateral triangular stubs into this structure, good impedance matching can be obtained at 915 MHz, which is the center frequency of the North-American UHF-RFID band (902 to 928 MHz). Besides exhibiting acceptable 5m read range in free space at 915 MHz, the proposed design shows a read range of about 4.5 when mounted on a metallic object (200 ×30 cm2) separated by spacer foam of thickness 1 cm. Furthermore, the proposed design shows a reasonable read ranges when it is mounted on different dielectrics with low permittivity. The proposed design has a simple configuration, low cost, acceptable read range, and can work on various background materials.  
      PubDate: Thu, 21 Mar 2019 16:46:00 -040
       
  • Modeling a Planar Coupled Microstrip Lines using various Wavelets and
           Method of Moments

    • Authors: M. Bayjja; M. Moubadir, G. Alsharahi, M. Aghoutane, N. Amar Touhami
      Abstract: In this paper, we apply a several wavelets basis functions to the method of moments to modeling the parallel-coupled microstrip lines. The first set of equations is for the shielded microstrip line solved with moment’s method and wavelets. The Green’s function is obtained from the theory of images. The second set are for the parallel-coupled microstrip lines operating in the TEM mode or when the analysis can be based on quasi-static approximation, the properties of coupled lines can be determined from the self- and mutual inductances and capacitances for the lines. To demonstrate the effectiveness and accuracy of the proposed technique, numerical results of even- and odd-mode characteristic impedances, coupling coefficient, percentage sparsity achieved in the impedance matrix, the CPU Time to reverse impedance matrix, and error relative for Daubechies, Coiflets,   Biorthogonal and Symlets wavelets are presented. Numerical results are in good agreement with those in previous publications.
      PubDate: Wed, 20 Mar 2019 06:51:00 -040
       
  • Lightning Response of Multi-Port Grids Buried in Dispersive Soils: An
           Approximation versus Full-wave Methods and Experiment

    • Authors: S. S. Sajjadi; S. R. Ostadzadeh
      Abstract: In this paper, application of multi-conductor transmission line model (MTL) in transient analysis of grounding grids buried in soils with frequency-dependent electrical parameters (dispersive soil) is investigated. In this modeling approach, each set of parallel conductors in the grounding grid is considered as a multi-conductor transmission line (MTL). Then, a two-port network for each set of parallel conductors in the grid is then defined. Finally, the two-port networks are interconnected depending upon the pattern of connections in the grid and its representative equations are then reduced. Via solving these simplified equations, the transient analyses of grounding grids is efficiently carried out. With the aim of validity, a number of examples previously published in literature are selected. The comparison of simulation results based on the MTL shows good agreement with numerical and experimental results. Moreover, in despite of numerical methods computational efficiency is considerably increased.
      PubDate: Tue, 19 Mar 2019 10:56:18 -040
       
  • Design of a Polarization-Independent Dual-Band Electromagnetically Induced
           Transparency-Like Metamaterial

    • Authors: O. Demirkap; F. Bagci, A. E. Yilmaz, B. Akaoglu
      Abstract: In this study, the classical analog of single and dual-band electromagnetically induced transparency is demonstrated with a four-fold symmetric metamaterial consisting of a Minkowski fractal ring resonator surrounded by a square ring resonator. The proposed metamaterials show high transmission ratios at the polarization independent resonances, as confirmed by the applied two different numerical methods. Delay-bandwidth products are found to be 0.34 and 0.61 at the resonances of the dual-band metamaterial. The peak frequencies and transmission ratios maintain also for oblique angle of incidences. These features of the proposed metamaterials are promising for single and multi-band filtering applications as well as for slow light and sensing devices.
      PubDate: Sun, 17 Mar 2019 17:20:47 -040
       
  • Artificial Chiral Media Using Conical-Coil Wire Inclusions

    • Authors: G. B. DeMartinis; D. Kalluri
      Abstract: The electromagnetic response of the electrically small conical wire coil as a chiral inclusion is described. An existing model of the helical coil wire inclusion is extended to model the conical coil wire inclusion, using the Method of Moments (MoM) to determine the dominant resonant circuit impedance of the inclusion. Material parameters are determined using mixing relations with polarizability coefficients expressed for the conical coil inclusion geometry. The polarization conversion of a dielectric slab loaded with conical coil inclusions is predicted and compared to simulated results using a forward scattering technique.
      PubDate: Sun, 17 Mar 2019 16:37:43 -040
       
  • Improved Efficiency of Inductive Power Transfer in Misalignment Conditions
           with Multi Coil Design

    • Authors: P. B. Laksono; M. Alaydrus
      Abstract: In charging process of electric vehicle, a misalignment between the transmitter (Tx) and receiver (Rx) coupling  structure decreases the efficiency of the wireless power transfer. In inductive power transfer system, misalignment reduces the effective coupling between the Tx and Rx coils. In this work, based on previous multiple coil structures, a new multi coil design in proposed to increase the efficiency of the power transfer. Here, a multi coil structure with two rectangular and four spiral coils is designed with the overall dimension of the coil structure 26.5 cm x 36.5 cm. The measurement shows, that for coil distance below 10.3 cm and a lateral misalignment of maximal 10 cm (27.4%), the efficiency of the designed multi coil structure is better compared to previous coil structures. However for larger coil distance or larger misalignment, the efficiency of the new coil structure deteriorates significantly.
      PubDate: Sun, 17 Mar 2019 15:04:30 -040
       
 
 
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