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Numerical Study of the Scattering of a Short-Pulse Plane Wave by a Buried Sphere in a Lossy Medium


F. Frezza1 F. Mangini1 M. Muzi2 P. Nocito3 E. Stoja1 N. Tedeschi1
1Department of Information Engineering, Electronics and Telecommunications, "La Sapienza" University of Rome, Rome, Italy
2Institute of Advanced Biomedical Imaging, "G. d'Annuzio" University Fondation, University "G. d'Annuzio" Chieti-Pescara, Chieti, Italy
3Istituto Superiore C.T.I., Communications Department, Ministry of Economic Development, Rome, Italy


Normalized scattered electric field by an air sphere embedded in glass.

The scattering by a buried sphere in the frequency domain with the use of the Finite Element Method (FEM) implemented by COMSOL Multiphysics, is analyzed. A short-pulse is used as an excitation with the spectrum spanning from 50 MHz to 1 GHz. In order to validate our results, a comparison with data available in the literature is presented, in the simple case of a perfectly-conducting (PEC) sphere. Afterwards, to gain insight on the role of the sphere radius and the distance of the buried sphere from the interface, other simulations are performed. The case of a dielectric sphere, instead of the perfectly-conducting one, is studied too.

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