scholarly journals Theoretical Study of the Input Impedance and Electromagnetic Field Distribution of a Dipole Antenna Printed on an Electrical/Magnetic Uniaxial Anisotropic Substrate

Electronics ◽  
2021 ◽  
Vol 10 (9) ◽  
pp. 1050
Author(s):  
Mohamed Lamine Bouknia ◽  
Chemseddine Zebiri ◽  
Djamel Sayad ◽  
Issa Elfergani ◽  
Jonathan Rodriguez ◽  
...  
Keyword(s):  
Electromagnetic Field ◽  
Method Of Moments ◽  
Input Impedance ◽  
Theoretical Study ◽  
Uniaxial Anisotropy ◽  
Dipole Antenna ◽  
Electromagnetic Field Distribution ◽  
Anisotropic Substrate ◽  
Computing Method ◽  
Calculation Code

The present work considers the investigation of the effects of both electrical and magnetic uniaxial anisotropies on the input impedance, resonant length, and fields distribution of a dipole printed on an anisotropic grounded substrate. In this study, the associated integral equation, based on the derivation of the Green’s functions in the spectral domain, is numerically solved employing the method of moments. In order to validate the computing method and the evaluated calculation code, numerical results are compared with available data in the literature treating particular cases of electrical uniaxial anisotropy; reasonable agreements are reported. Novel results of the magnetic uniaxial anisotropy effects on the input impedance and the evaluated electromagnetic field are presented and discussed. This work will serve as a stepping stone for further works for a better understanding of the electromagnetic field behavior in complex anisotropic and bi-anisotropic media.

scholarly journals Theoretical Analysis and Design of an Innovative Coil Structure for Transcranial Magnetic Stimulation

2021 ◽  
Vol 11 (4) ◽  
pp. 1960
Author(s):  
Naming Zhang ◽  
Ziang Wang ◽  
Jinhua Shi ◽  
Shuya Ning ◽  
Yukuo Zhang ◽  
...  
Keyword(s):  
Electromagnetic Field ◽  
Transcranial Magnetic Stimulation ◽  
Theoretical Analysis ◽  
Numerical Simulations ◽  
Magnetic Stimulation ◽  
Influential Factors ◽  
Intersection Angle ◽  
Electromagnetic Field Distribution ◽  
Analysis And Design ◽  
Coil Structure

Previous research showed that pulsed functional magnetic stimulation can activate brain tissue with optimum intensity and frequency. Conventional stimulation coils are always set as a figure-8 type or Helmholtz. However, the magnetic fields generated by these coils are uniform around the target, and their magnetic stimulation performance still needs improvement. In this paper, a novel type of stimulation coil is proposed to shrink the irritative zone and strengthen the stimulation intensity. Furthermore, the electromagnetic field distribution is calculated and measured. Based on numerical simulations, the proposed coil is compared to traditional coil types. Moreover, the influential factors, such as the diameter and the intersection angle, are also analyzed. It was demonstrated that the proposed coil has a better performance in comparison with the figure-8 coil. Thus, this work suggests a new way to design stimulation coils for transcranial magnetic stimulation.

Force de répulsion entre un courant sinusoïdal linéique et une bande conductrice mince : application aux problèmes de lévitation

1994 ◽  
Vol 72 (9-10) ◽  
pp. 633-638
Author(s):  
M. T. Attaf ◽  
D. Allab
Keyword(s):  
Electromagnetic Field ◽  
Steady State ◽  
Electromagnetic Interaction ◽  
Practical Interest ◽  
Stationary Case ◽  
Electromagnetic Field Distribution ◽  
Conducting Plate ◽  
Conducting Materials ◽  
Sinusoidal Current ◽  
Repulsive Forces

In a previous work, the authors presented a semianalytical treatment of the electromagnetic field distribution in the case of a straight conductor carrying a sinusoidal current parallel to a thin conducting plate. The result of this investigation is extended here to the evaluation of the repulsive forces accompanying this type of electromagnetic interaction. The variation of such forces with geometric parameters is studied in the presence of a single conductor, and in the case of several conductors laying in a plane parallel to the surface of the material submitted to the induction phenomenon. The problem of lévitation in steady-state conditions is examined, in the light of this arrangement, for various conducting materials. Graphs illustrate the results obtained and make evident their practical interest particularly in the stationary case of magnetically levitated vehicles.

scholarly journals Electromagnetic field distribution in a quasi-ID rhombic waveguide array

2016 ◽  
Vol 737 ◽  
pp. 012008 ◽  
Author(s):  
A I Maimistov ◽  
V A Patrikeev
Keyword(s):  
Electromagnetic Field ◽  
Field Distribution ◽  
Waveguide Array ◽  
Electromagnetic Field Distribution

scholarly journals Verification of modeling wired antennas by the method of moments

2021 ◽  
Vol 2021 (1) ◽  
Author(s):  
A. Alhaj Hasan ◽  
◽  
A.A. Kvasnikov ◽  
S.P. Kuksenko ◽  
T.R. Gazizov ◽  
...  
Keyword(s):  
Method Of Moments ◽  
Input Impedance ◽  
Computer Aided Design ◽  
Segment Length ◽  
Good Match ◽  
Half Wave ◽  
Computer Aided ◽  
Design Systems ◽  
Aided Design ◽  
Frequency Dependences

. Modeling of several antennas by the method of moments in the TALGAT system was performed for comparison with tested results. At first, the published results for half-wave and wave dipoles are compared with our results. Current module distributions and frequency dependences of the real and imaginary parts of the input impedance are obtained. The results showed a good match. Then the published experimental and analytical results for the radiation pattern and frequency dependence of the admittance of the gull shape antenna are compared with our results. The convergence of the results with segment length decreasing is shown. A good match is obtained. It is shown that detailed testing is important in the process of implementation and development of computer-aided design systems

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