scholarly journals 2D-FDTD METHOD TO ESTIMATE THE COMPLEX PERMITTIVITY OF A MULTILAYER DIELECTRIC MATERIALS AT KU-BAND FREQUENCIES

2020 ◽  
Vol 91 ◽  
pp. 155-164
Author(s):  
Lahcen Ait Benali ◽  
Jaouad Terhzaz ◽  
Abdelwahed Tribak ◽  
Angel Mediavilla Sanchez
Keyword(s):  
Complex Permittivity ◽  
Fdtd Method ◽  
Dielectric Materials ◽  
2D Fdtd ◽  
Multilayer Dielectric ◽  
Ku Band

A New Technique to Determine the Complex Permittivity of Each Layer for a Bi-Layer Dielectric Material at Microwave Frequency

2017 ◽  
pp. 115-145
Author(s):  
Hassan Elmajid ◽  
Jaouad Terhzaz ◽  
Hassan Ammor
Keyword(s):  
Complex Permittivity ◽  
Relative Permittivity ◽  
Dielectric Material ◽  
Dielectric Materials ◽  
New Technique ◽  
S Parameters ◽  
A New Technique ◽  
Relative Errors ◽  
The Individual ◽  
Ku Band

A new technique is presented to determine the complex relative permittivity of each layer of a bi-layer dielectric material. The bi-layer material sample is loaded in a Ku-band rectangular waveguide and its two port S-parameters are measured as a function of frequency using a Network Analyzer. Also, by applying the mode matching technique, expressions for the S-parameters of the bi-layer dielectric material as a function of complex relative permittivity of each layer are developed. To estimate the complex permittivity of each layer for a bi-layer dielectric material, the square sums of errors between the measured and calculated S-parameters are minimized using a nonlinear optimization algorithm. The complex permittivity of each layer for a bi-layer dielectric material such as FR4-Teflon, FR4-Delrin and Delrin-Teflon are determined at the Ku-band frequencies, the average relative errors between the individual dielectric materials and those of each layer of bi-layer dielectric materials are calculated.

Evaluation of the accuracy of reconstruction of the electrophysical and geometric parameters of multilayer dielectric coatings by the multi-frequency radio wave method of a slow surface electromagnetic waves

2020 ◽  
pp. 51-58
Author(s):  
Aleksandr I. Kazmin ◽  
Pavel A. Fedjunin
Keyword(s):  
Radio Wave ◽  
Noise Level ◽  
Electromagnetic Waves ◽  
Dielectric Materials ◽  
Geometric Parameters ◽  
Experimental Investigations ◽  
Wave Method ◽  
Dielectric Coatings ◽  
Surface Electromagnetic Waves ◽  
Multilayer Dielectric

One of the most important diagnostic problems multilayer dielectric materials and coatings is the development of methods for quantitative interpretation of the checkout results their electrophysical and geometric parameters. The results of a study of the potential informativeness of the multi-frequency radio wave method of surface electromagnetic waves during reconstruction of the electrophysical and geometric parameters of multilayer dielectric coatings are presented. The simulation model is presented that makes it possible to evaluate of the accuracy of reconstruction of the electrophysical and geometric parameters of multilayer dielectric coatings. The model takes into account the values of the electrophysical and geometric parameters of the coating, the noise level in the measurement data and the measurement bandwidth. The results of simulation and experimental investigations of reconstruction of the structure of relative permittivitties and thicknesses of single-layer and double-layer dielectric coatings with different thicknesses, with different values of the standard deviation (RMS) of the noise level in the measured attenuation coefficients of the surface slow electromagnetic wave are presented. Coatings based on the following materials were investigated: polymethyl methacrylate, F-4D PTFE, RO3010. The accuracy of reconstruction of the electrophysical parameters of the layers decreases with an increase in the number of evaluated parameters and an increase in the noise level. The accuracy of the estimates of the electrophysical parameters of the layers also decreases with a decrease in their relative permittivity and thickness. The results of experimental studies confirm the adequacy of the developed simulation model. The presented model allows for a specific measuring complex that implements the multi-frequency radio wave method of surface electromagnetic waves, to quantify the potential possibilities for the accuracy of reconstruction of the electrophysical and geometric parameters of multilayer dielectric materials and coatings. Experimental investigations and simulation results of a multilayer dielectric coating demonstrated the theoretical capabilities gained relative error permittivity and thickness of the individual layers with relative error not greater than 10 %, with a measurement bandwidth of 1 GHz and RMS of noise level 0,003–0,004.

Compact 2D FDTD method for modeling photonic crystal fibers

2004 ◽  
Author(s):  
Shuqin Lou ◽  
Zhi Wang ◽  
Guobin Ren ◽  
Shuisheng Jian
Keyword(s):  
Photonic Crystal ◽  
Photonic Crystal Fibers ◽  
Fdtd Method ◽  
Crystal Fibers ◽  
2D Fdtd

scholarly journals Photonic band gap of multiferroic-dielectric materials in the IR region: FDTD method

2019 ◽  
Vol 539 (1) ◽  
pp. 50-54
Author(s):  
Selami Palaz ◽  
Sevket Simsek ◽  
Amirullah M. Mamedov ◽  
Ekmel Ozbay
Keyword(s):  
Band Gap ◽  
Photonic Band Gap ◽  
Fdtd Method ◽  
Dielectric Materials ◽  
Photonic Band
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