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 μ″ of the coating material has a more significant influence on the RCS reduction of the STW than the permittivity ɛ″. Furthermore, the simulated results were verified by the experimental results with an error of less than 20%.

中文翻译：

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表面行波的散射及其在吸收涂层中的衰减

表面行波 (STW) 对非镜面散射有很大贡献，但它们在吸收涂层中的散射和衰减特性尚不清楚。因此，计算了 STW 的散射峰值角位置和电磁 (EM) 损失。结果表明，吸收涂层的厚度应适当，以在宽频带宽内实现较大的电磁损耗，并且磁损耗在衰减常数中占主导地位。此外，还研究了 STW 的雷达截面 (RCS) 特征以及 EM 参数的虚部对 STW 在 6 GHz 下的 RCS 减少的影响。仿真结果表明，楔形模型可以有效地激发STW。同时，磁导率μ″的涂层材料对 STW 的 RCS 降低的影响比介电常数ɛ ″更显着。此外，通过实验结果验证了模拟结果，误差小于20%。