Modeling the backscattering response of tree trunks at MMW frequencies

We examine the MM wave polarimetric response of tree trunks at near grazing incidence. A tree trunk possesses a strong MM wave backscatter response, in part, due to its substantial vertical extent above ground. Although, several scattering mechanisms contribute to the the backscatter response of a tree trunk above ground, only the direct backscatter component of the trunk is considered. A geometric-optics model for predicting the MM wave backscatter response of tree trunks and rough dielectric cylinders is proposed first, then compared to the measurements performed at 95 GHz.