FDTD based numerical Green´s function for S-parameter measurement in inverse scattering problems

We present a numerical Green´s function that serves as the kernel for volume integral equation (VIE) in inverse scattering problems. The primary motivation for this research is to address the lack of full antenna modeling in the VIE when solving inverse scattering problems. The numerical Green´s function introduced here directly links the total field in the object domain and the object´s dielectric properties to the measured scattered S parameters in the presence of the antennas and a presumed imaging cavity.