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Resonance Behavior of a Conducting Wire Object Below a Halfspace

The resonance scattering phenomena of an object buried below a dielectric halfspace has been studied with potential applications such as unexploded ordnance detection and breast tumor screening. These studies adopted a theoretical approach where the resonant frequencies are numerically determined via a complex root searching procedure from the impedance matrix obtained from an integral equation formulation. The practically of retrieving these resonant modes from transient responses under different excitation aspects, though is crucial for subsurface target detection application, has not been well studied. In this paper, the resonant frequencies and the corresponding residues are extracted from the transient responses of a metallic wire object below halfspace. We found that the same set of resonant modes is extracted in most cases, but the residues vary significantly as the incident angle.