In application to active microwave remote sensing, the counterwise RL (left-hand circularly polarized transmitting and right-hand circularly polarized receiving) and LR polarized bistatic scattering are generally stronger than the likewise LL and RR ones, respectively. In this paper, we investigate the circularly polarized propagation over terrain profile at 1.575 GHz and 900 MHz in application to wireless communication. Completely different from common sense in remote sensing, however, numerical simulations show that field strengths for likewise polarizations are larger than those for counterwise polarizations. For further verification, circularly polarized bistatic scattering from terrain is also provided, which is consistent with previous conclusion that the counterwise LR polarized one is larger. Physical mechanism of such a contradictory behavior is explicated by local Fresnel reflections, and physical insights are offered for terrain propagation of circular polarizations. It is suggested that the likewise configuration be adopted in wireless communication, although the counterwise is adopted in microwave remote sensing.
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