Scattering of surface traveling wave and its attenuation in absorbing coating

Surface traveling waves (STWs) contribute greatly to non-specular scattering, but their scattering and attenuation characteristics in an absorbing coating are unclear. Thus, the scattering peak angular location and the electromagnetic (EM) loss of the STWs are calculated. The results show that the thickness of an absorbing coating should be appropriate to achieve a large EM loss in wide frequency bandwidth, and the magnetic loss is dominant in the attenuation constant. Moreover, radar cross section (RCS) features of the STW and the effect of EM parameters' imaginary part on the RCS reduction of the STW at 6 GHz were investigated. The simulated results show that the wedge model can effectively excite the STW. Meanwhile, the permeability mu & DPRIME; of the coating material has a more significant influence on the RCS reduction of the STW than the permittivity e & DPRIME;. Furthermore, the simulated results were verified by the experimental results with an error of less than 20%.