Improved technique for radar absorbing coatings characterization with rectangular waveguide and numerical modeling

<span>For materials characterization, several methods have been developed. Most of them need a sample to be machined prior testing process. Hence, they are destructive and cannot used for in-situ radar absorbing coatings testing. This requires employing suitable measurement technique extract their electromagnetic properties quickly accurately. In this paper, the swept frequency probe reflection is proposed broadband nondestructive characterization using finite flange open-ended rectangular waveguide. The based on fact that an independent variable probe’s coefficient by which its data set selected points can directly measured in one step varying frequency. Finite-difference time-domain (FDTD) method was adopted calculate coefficients at different test conditions. Simple interpolation approximation employed since dependent parameters. Error analysis numerically performed evaluate influences both size coated material thickness accuracy measurements, carried out samples X-band verify technique. Comparing with existing methods, simplifies speeds up process improves repeatability accuracy.</span>