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A new geometry-based channel model is proposed for wide-band polarized body-area-network channels consisting of four propagation modes, i.e., cylindrical surface scattering (CSS) for above-ground off-body scattering (BS), BS for body diffracted and on-BS, ground scattering (GS), and line-of-sight. A conservation-of-polarization plane methodology is used for the CSS and GS propagation modes. For the BS propagation mode, a geometrical theory of diffraction is used and related to CSS. The channel cross-polarization discrimination (XPD) and time-frequency correlation function (TF-CF) are derived from the model. Comparisons of the XPD and the TF-CF that are obtained from the model (with appropriate physical parameters) and those obtained from wide-band measurements at 13-GHz are in good agreement. We observed the GS propagation mode to be the dominant mode in our experiments. The azimuth angle of arrival (AAoA) of a ground reflected wave is shown in theory to have a significant effect on the XPD.