Abstract: The electromagnetic scattering characteristics of rain media and targets are discussed in the polarization field, with the scattering matrix of rain area and targets are obtained. In the millimeter band, the variations are found of the power density of the rain clutter induced by back scattering with frequency and rain rate. The polarization filtering enhancement of the finite length cylinder in rain clutter are numerically modeled. Then, the position on the Poincare sphere corresponding to the maximum SCR can be confirmed, and the optimum polarization state of transmitting and receiving antennas can be given.

Key words: rain clutter, scattering matrix, polarization filter