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

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Advanced Electromagnetics     Open Access   (Followers: 19, SJR: 0.154, CiteScore: 1)
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Advanced Electromagnetics
Journal Prestige (SJR): 0.154
Citation Impact (citeScore): 1
Number of Followers: 19  

  This is an Open Access Journal Open Access journal
ISSN (Online) 2119-0275
Published by Advanced Electromagnetics Homepage  [1 journal]
  • Relative humidity FOS design using spherical hydrogel on no-core multimode

    • Authors: A. Nasiri; S. Makouei, T. Y. Rezaii
      Abstract: In this paper, the design and simulation of a new optical fiber-based relative humidity (RH) sensor formed by spherical hydrogel droplets over the no-core fiber is stablished. The introduced sensor is capable of detecting humidity changes based on Evanescent waves and splice losses. Refractive index of PEGDMA hydrogel sphere changes with variation of humidity which can cause intensity changes in fiber. The sensor structure includes a no-core fiber in the length of 4 mm connected to two multimode fibers which performs sensing by three hydrogel spheres with diameter of 1 mm. The sensor operation wavelength is adjusted at 631nm. The results show that the designed structure has linear response for humidity in the range of 20 to 95%RH. In the meantime, the obtained sensitivity is about 0.13643 mW /% RH. The simulated sensor has some useful advantages in addition to having some associated with the two primary sensors including the simplicity of the structure and the sensor's function which can be explained by reduction of the length of sensing portion and increase in the sensitivity and range of humidity detection.
      PubDate: Fri, 10 Jan 2020 06:41:46 -050
  • Radar Cross Section Reduction of Metallic Plate Loaded with Via Hole
           Dielectric Substrate

    • Authors: H. A. Malhat; S. H. Zainud-Deen, N. A. Shabayek
      Abstract: Radar cross section (RCS) stealth technology has a major importance in the military applications. In this paper, RCS reduction of metallic sheet is investigated through loading it by dielectric substrate with tapered via holes. The via holes tapering are drilled in two approaches according to the choice of the reference hole radius. In the first approach, the via holes are tapered in a single direction from row to row and are kept fixed along the single
      row. A reduction on RCS of 13 dB below the unloaded case is achieved. The RCS reduction frequency band is shifted down by increasing the negative value of scaling parameter due to the reduction of the effective dielectric constant of the dielectric sheet. In the second approach, the holes are tapered along the off-diagonal directions where the tapering occurs along both row and column. A symmetrical structure around the main diagonal is produced. The reduction in RCS is achieved with the band from 11 to 12.75 GHz for different scaling coefficient values with best RCS reduction of 33.5 dB occurs at α=0.18. Symmetrical wide angle RCS reduction from -109o to 109o degrees is reached.
      PubDate: Sat, 21 Dec 2019 12:43:43 -050
  • Sparse Polynomial-Chaos Models for Stochastic Problems with Filtering

    • Authors: T. Zygiridis; A. Papadopoulos, N. Kantartzis, E. Glytsis
      Abstract: This work develops sparse polynomial models for investigating the response of electromagnetic filtering structures, when the design of the latter is affected by a number of uncertain variables. The proposed approach describes an improved implementation framework for contemporary Compressed Sensing techniques, which are known for their capacity to reconstruct sparse signals with a limited number of samples. Unlike typical implementations, the necessary set of basis functions is formulated after performing an initial estimation of partial variances that, despite being computationally cheap, provides sufficient information for the impact of each variable on the output. A number of numerical tests on different filter configurations verify the reliability of the presented methodology, display its efficiency, and unveil the performance of the considered structures, when operated under uncertainty.
      PubDate: Tue, 17 Dec 2019 14:53:40 -050
  • Forward recursion approach of electromagnetic wave propagation
           characteristics in a slab of inhomogeneous magnetoplasma

    • Authors: A. M. AL-Khateeb; M. A. Khasawneh, M. S. Bawa'aneh
      Abstract: Propagation characteristics of electromagnetic radiation incident on an inhomogeneous magnetoplasma slab near a good conducting metallic surface is investigated. The inhomogeneous plasma slab is divided into thin layers (sub-cells) in order to allow for treating each plasma sub-cell as a homogeneous medium. A global matrix is formed upon matching the fields at all interfaces, which allows for the analytical determination of the reflection, absorption and transmission coefficients. For matching the tangential fields at the metallic surface, an impedance (Leontovich) boundary condition has been used. Propagation characteristics are calculated numerically for a set of parameters that may be suitable for many applications including stealth plasma. Numerical results show resonant absorption peaks near the electron cyclotron frequency that increase by increasing the equilibrium plasma density. They also show absorption enhancement by increasing the plasma slab width.
      PubDate: Tue, 17 Dec 2019 13:16:47 -050
  • A Mode-Matching Solution for Scattering from a Large Isosceles Right
           Triangle Groove in PEC Plane

    • Authors: M. Bozorgi
      Abstract: In this literature, scattering from a large Isosceles Right Triangle Groove (IRTG) in a perfect electric plane (PEC) is studied. An efficient Mode-Matching manner involving physical optics approximation is applied to a large IRTG. Considering two synthetic PEC walls over the groove, the tangential fields inside and outside of the groove are expanded as the sums of infinite harmonics modes. By applying the boundary conditions, the modes are matched on IRTG and a linear system of equations based on series coefficients is constructed. Since matrix elements are computed analytically, finding the inverse an N×N matrix is the most time-consuming operation in this manner. The obtained results are verified by two full numerical techniques MoM and FEM.
      PubDate: Tue, 17 Dec 2019 12:34:21 -050
  • Markov Chain Monte Carlo Solution of Poisson’s Equation in
           Axisymmetric Regions

    • Authors: A. E. Shadare; M. N. O. Sadiku, S. M. Musa
      Abstract: The advent of the Monte Carlo methods to the field of EM have seen floating random walk, fixed random walk and Exodus methods deployed to solve Poisson’s equation in rectangular coordinate and axisymmetric solution regions. However, when considering large EM domains, classical Monte Carlo methods could be time-consuming because they calculate potential one point at a time. Thus, Markov Chain Monte Carlo (MCMC) is generally preferred to other Monte Carlo methods when considering whole-field computation. In this paper, MCMC has been applied to solve Poisson’s equation in homogeneous and inhomogeneous axisymmetric regions. The MCMC results are compared with the analytical and finite difference solutions.     
      PubDate: Tue, 17 Dec 2019 11:52:12 -050
  • Effect of Ballistic Electrons on the Optical Response of Hyperbolic

    • Authors: G. M. Marega, E. Marega Jr; B.-H. V. Borges, A. F. da Mota
      Abstract: This paper presents a theoretical and experimental study of the effect of ballistic electrons on the optical response of MIM (Metal-Insulator-Metal) like hyperbolic metamaterial structures. The simulated model using standard parameters and the experimental optical transmission show a 20% peak difference due to the presence of ballistic transport in the metal. A semi-analytic approximation based on the Drude's model is used for accurately predicting the optical response of the hyperbolic substrate and plasmon damping in the fabricated metasurfaces.
      PubDate: Tue, 17 Dec 2019 11:26:04 -050
  • Analysis of the Effect of a Gyrotropic Anisotropy on the Phase Constant
           and Characteristic Impedance of a Shielded Microstrip Line

    • Authors: D. Sayad; C. Zebiri, S. Daoudi, F. Benabdelaziz
      Abstract: In this work, we present an analytical modeling of a highly complex medium-based shielded microstrip line. The study aims at a numerical evaluation of the characteristic impedance and the dispersion characteristics of the dominant hybrid mode in the microstrip line printed on an anisotropic medium. The newly considered complex anisotropy has a full 3×3 tensor form of permittivity and permeability. The study is based on the derivation of the Green's functions of the general complex-medium-based structure in the Fourier domain. The spectral Method of Moments (MoM) and the Galerkin's procedure are combined to solve the resulting homogeneous system of equations. The effect of the gyrotropic anisotropy on the phase constant and the characteristic impedance is particularly investigated. Original and interesting numerical results are obtained and discussed. Our results are found to be in good agreement with available isotropic case data reported in literature.
      PubDate: Tue, 17 Dec 2019 08:56:18 -050
  • Circular Polarization Antenna-Filter

    • Authors: S. Bankov; A. Davydov, V. Kalinichev, P. Viugin, A. Kurushin
      Abstract: A two-function filtering antenna device in the 1-2 GHz band is investigated. The device radiates or receives electromagnetic waves of circular polarization and simultaneously performs the function of a second-order bandpass filter. The considered design consists of a dual-mode printed antenna-resonator coupled with two non-radiating resonators which are fed by a quadrature balanced power divider. Using the model in the form of an equivalent circuit the main features of the structure synthesis and its tuning are analyzed including potentially achievable characteristics. The results of the numerical simulations using electromagnetic software are presented in comparison with the experimental characteristics for the prototype made of high-permittivity high-quality ceramics. It is found that the proposed design is characterized by an almost two-fold increase of the operating frequency band compared to the resonant antenna itself while maintaining a low level of cross-polarization within the passband. It is also shown that the design has the frequency response of the second-order bandpass filter.
      PubDate: Tue, 17 Dec 2019 08:08:30 -050
  • Enhanced Accuracy of Breast Cancer Detection Based on UWB Compact Slotted
           Monopole Antennas

    • Authors: I. Amdaouch; O. Aghzout, A. Naghar, A. V. Alejos, F. Falcone
      Abstract: This work presents a new breast tumor detection system based on an omnidirectional microstrip ultra wideband antenna. The localization coordinates of the tumor are studied in detail for better tumor detection. The coordinates of the corresponding maximum value of SAR are identified in order to accurately detect different locations of tumor inside the breast. The results show that relying on these coordinates; the tumor can be detected with high accuracy. The possibility of mutual interferences with other systems operating at the FCC frequency band is considered as a major issue in UWB systems. Therefore, rejected out-band interference signals is introduced by etching single and double U-shaped slots on the radiating element, then a first and second frequency band are successfully produced respectively. The proposed antenna is a compact antenna that can be used on microwave imaging detection. The antenna gain was larger than 2 dbi with an omnidirectional radiation pattern over the whole frequency-band. A relatively flat group delay of the antenna response is also achieved. Antenna prototype has been manufactured and measured, results prove the performance of the proposed antenna.
      PubDate: Tue, 17 Dec 2019 07:55:52 -050
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Heriot-Watt University
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