Carbon-fiber-reinforced-polymer (CFRP) materials have been widely used in military and civilian fields to replace metals as load-bearing structural components. Nevertheless, due to the complex and anisotropic internal structures, its electromagnetic (EM) protection capability is different from metal materials. Aiming at studying the EM properties of CFRP materials, an efficient analysis method based on the anisotropic finite-difference time-domain (FDTD) algorithm was proposed. First, the equivalent EM parameter tensors of a single-layer CFRP lamina were calculated by using the $S$ -parameter retrieval method. Then, a multilayer equivalent EM parameter model was established, and the execution equations of the anisotropic FDTD algorithm were derived. Finally, the influence of layer number, fiber orientation pattern, carbon fiber conductivity, and doping ratio on EM properties were studied by using the obtained method. The numerical analysis results indicated that the proposed method could improve the computational efficiency significantly while keeping the accuracy. The conclusions can provide certain engineering guidance for the electrical application of CFRP materials.

中文翻译：

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用各向异性 FDTD 法分析 CFRP 的电磁特性

碳纤维增强聚合物（CFRP）材料已广泛用于军事和民用领域，以替代金属作为承重结构部件。然而，由于内部结构复杂且各向异性，其电磁（EM）防护能力不同于金属材料。针对CFRP材料的电磁特性研究，提出了一种基于各向异性有限差分时域（FDTD）算法的高效分析方法。首先，单层CFRP层的等效电磁参数张量通过使用$新元 -参数检索方法。然后，建立了多层等效电磁参数模型，推导了各向异性FDTD算法的执行方程。最后，利用所获得的方法研究了层数、纤维取向图案、碳纤维电导率和掺杂比对电磁性能的影响。数值分析结果表明，该方法在保持精度的同时，能显着提高计算效率。该结论可为CFRP材料的电气应用提供一定的工程指导。