Improved technique for radar absorbing coatings characterization with rectangular waveguide and numerical modeling
الباحثونAbdulkadhim Ameen Hassan، Janan Hameed Saadie
المجلة
International Journal of Electrical and Computer Engineering (IJECE)
مختصر البحثAbstract
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 mehtod and flange d rectangular waveguide probe
الباحثونAbdulkadhim Ameen Hassan ، Janan Hammed Saadie
المجلةIndonesian Journal of electrical engineering and informatics
مختصر البحثThis 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.
Ring -Shape force platform for developing instrumented throwing and shifting forces due to rotation analysis
الباحثونMaher J.Ameen Abdulkadhim Ameen Hassan
Ahmed M.Sadeq, Janan Hammed Saadie
، Abdulkadhim Ameen Hassan
Ahmed M.Sadeq, Janan Hammed Saadie
المجلةInternational IOT electronics and mechatronics conference
Experimental and Modelling the Combined
Measurements Technique for Microwave Absorbing
Coatings Testing with Finite Difference Time
Domain Method
الباحثونAbdulkadhim A. Hassan
، Janan H. Saadie
المجلةIOP Conference Series: Materials Science and Engineering
A Nondestructive Technique for EM-Parameter
Determination of Compound Materials using
Rectangular Waveguide Sensor and Layered
Material Media
الباحثونAbdulkadhum A. Hassan، Janan H. Saadie
المجلةInternational Journal of Advanced Engineering Research and Science (IJAERS)
مختصر البحثn this paper, an improved technique of using
open-ended rectangular waveguide sensor for
simultaneous non-destructive complex electromagnetic
parameters determination of compound absorbing
materials is developed.
Assessing of Thermal Conductivity, Physical and Mechanical Properties of Building Insulation Materials Prepared From Waste Materials and Gypsum
الباحثونJanan H. Saadie
المجلةInternational Journal of Engineering & Technology
مختصر البحثAbstract Carbon adsorbent materials that were prepared from sunflower straw by a
combination of pre-treatment and low-temperature pyrolysis showed better adsorption
compared with untreated carbon. Four different pre-treatment agents (steam, alkali (KOH),
phosphoric (H3PO4), and salt (ZnCl2)) were analyzed with respect to their effects on the
maximum surface area and the micropore area. Samples were measured by
thermogravimetric analysis (TGA), X-ray powder diffraction (XRD), scanning electron ...
