Pulse diffraction by a circular dielectric cylinder

Abstract

In this article, the periodic pulse diffraction from the circular dielectric object radiated by the horn antenna is investigated and experimental verification is provided. The pulse spectrum with Hamming weight function (Hamming window) form occupies the frequency band of 38 – 52 GHz. The problem is solved using the Method of Auxiliary Sources, and the results of the computer simulation are obtained. The fundamental advantage of the method is to eliminate the singularity problem during the solution of the integral equation obtained by boundary conditions on each scatterer. The comparison is done with the experimental data, which shows good agreement between the simulation outcomes and the experimental ones. The correctness of the determination of the electric size of the object by the analysis of the scattered pulse echo serves as the verification of the approach. The outcomes reveal that less than a 3% deviation is observed between numerical and experimental analysis.

Dielectric cylinder discrimination with ANN using phase information of synthesized time-domain response

“…The problem is to obtain a reflected signal for a set of objects with various diameters with small step in a comparatively simple way for network training. The method of auxiliary sources (MAS), based on the shifting of the sources from the real surface to auxiliary surfaces, allows for high-precision calculations and obtaining reliable results, which is confirmed by good agreement with experimental data [6].…”

“…The scattered electromagnetic field at the waveguide was expressed by MAS [6], where a horn antenna was used both as the electromagnetic wave radiator and receiver. Using this approach, complex reflectivity distribution for five dielectric cylinders ( ) with radii in the range between 15 and 35 mm with a 5 mm step were obtained t a grid of frequencies.…”

“…The authors thank Prof. V. Tabatadze for his cooperation in obtaining the results presented in the publications [6,7], that were used within the framework of this paper.…”