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All Journal International Journal of Electrical and Computer Engineering Indonesian Journal of Electrical Engineering and Informatics (IJEEI)
Abdulkadhim Ameen Hassan
Kufa University
Computer Science & IT Electrical & Electronics Engineering

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Improved technique for radar absorbing coatings characterization with rectangular waveguide and numerical modeling Abdulkadhim Ameen Hassan; Janan Hameed Saadie
International Journal of Electrical and Computer Engineering (IJECE) Vol 12, No 4: August 2022
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijece.v12i4.pp3827-3837

Abstract

For materials characterization, several methods have been developed. Most of them need a sample to be machined prior to testing process. Hence, they are destructive and cannot be used for in-situ radar absorbing coatings testing. This requires employing a suitable measurement technique to extract their electromagnetic properties quickly and accurately. In this paper, the swept frequency of probe reflection technique is proposed for broadband nondestructive radar absorbing coatings characterization using finite flange open-ended rectangular waveguide. The technique is based on the fact that the frequency of measurement is an independent variable of probe’s reflection coefficient by which its data set of selected frequency points can be directly measured in one step by varying the frequency. Finite-difference time-domain (FDTD) method was adopted to calculate probe reflection coefficients at different test conditions. Simple interpolation approximation was employed since they are frequency dependent parameters. Error analysis was numerically performed to evaluate the influences of both flange size and coated material thickness on the accuracy of the measurements, which are carried out on several samples of radar absorbing coatings at X-band to verify the proposed technique. Comparing with the existing methods, the proposed technique simplifies and speeds up measurement process and improves its repeatability and accuracy.
Multilayer Structure Technique for Improving Determination of Electromagnetic Properties of Radar Absorbers Based on Two-Layer Method and Flanged Rectangular Waveguide Probe Abdulkadhim Ameen Hassan; Janan Hammed Saadie
Indonesian Journal of Electrical Engineering and Informatics (IJEEI) Vol 8, No 4: December 2020
Publisher : IAES Indonesian Section

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52549/ijeei.v8i4.1444

Abstract

This paper presents further development of utilization of  two-layer method to perform nondestructive electromagnetic properties determination of planar radar absorbers using flanged  open-ended rectangular waveguide probe. A multilayer  structure  of three layers was proposed to improve the measured results of these parameters obtained using two-layer method. These layers were arranged  such  that the test  material is sandwiched between two known low  loss materials to provide the  needed  two independent reflection coefficients necessary to extract them  at different conditions of  testing. The proposed  structure was aimed  to decrease the effect  of direct backing of test material by metal plate, which influences measurement accuracy if  two-layer  method  is used.  The structure permits a suitable electric field interrogation  in test material and decreases the influences of both  radial and surface waves.  FDTD method  was adapted  for  modeling  the problem geometry  to calculate  the reflection coefficients  since a probe with finite flange size is used. Measurements were carried out using the proposed technique to determine complex permittivity and complex permeability of several radar absorbers over X-band  applications of  microwaves. In comparison with both single-layer and two-layer methods results, the measured   results of  these parameters  agreed  well with the published data. by companies and literatures.
Co-Authors Janan Hameed Saadie Janan Hammed Saadie