TY - JOUR
ID - 4019
TI - Transmission and Reflection Characteristics of a Concrete Block Wall Illuminated by a TM-polarized Obliquely incident wave
JO - AUT Journal of Electrical Engineering
JA - EEJ
LA - en
SN - 2588-2910
AU - Ahmadi, Amirhossein
AU - Dehkhoda, Parisa
AU - Tavakoli, Ahad
AU - Dehmollaian, Mojtaba
AD - Department of Electrical Engineering, Amirkabir University of Technology, Tehran, Iran
AD - Amirkabir university of technology
AD - School of Electrical and Computer Engineering, University of Tehran, Tehran, Iran
Y1 - 2020
PY - 2020
VL - 52
IS - 2
SP - 179
EP - 186
KW - Concrete block-wall
KW - Floquet modes
KW - Periodic structure
KW - Reflection and Transmission coefficients
KW - TM-polarization
DO - 10.22060/eej.2020.18432.5353
N2 - Typically, many of the modern buildings have concrete walls constructed from cinder block walls, that have periodic nature in their relative dielectric constant. This periodic nature excites higher-order Floquet harmonic modes at microwave frequencies, which leads to the propagation of scattered waves along with non-specular directions. Periodic structures exhibit different behaviors when illuminated by different types of incident polarizations. Previous studies mainly focus on the Transverse Electric (TE) incident wave, where the behavior of a periodic layer is characterized easily by only considering the function of the relative permittivity in the equations. But, for a Transverse Magnetic (TM) incident plane wave, the first-order derivative of the relative permittivity function must be taken into account in the formulations. Accordingly, in this paper, reflection and transmission coefficients from a typical concrete block wall are formulated for a TM polarized incident wave. Exact boundary equations are written, and the effect of oblique incidence is taken into account. Also, the periodic nature of the inhomogeneous layer is represented by the Fourier series. In addition, two types of numerical validation are provided to prove the accuracy of the given theory. The ability to calculate Fourier series coefficients by taking the Fast Fourier Transform (FFT) of the relative permittivity function enables the introduced method to treat any type of periodic inhomogeneities.
UR - https://eej.aut.ac.ir/article_4019.html
L1 - https://eej.aut.ac.ir/article_4019_e83372ef1bf52eb45df3857397df0af8.pdf
ER -