Fig. 1. Structure schematic diagram of spiral-ring with carbon fiber composite microwave absorber.螺旋环-碳纤维复合吸波体结构示意图

Fig. 2. Relative complex permittivity of carbon fiber.碳纤维损耗层复相对介电常数频谱

Fig. 3. Settings of boundary conditions and incentive settings for the simulation model.仿真模型边界条件与激励设置

Fig. 4. Reflection loss of double layers metal spiral-ring with carbon fiber composite microwave absorber.双层金属螺旋环-碳纤维复合吸波体的反射损耗

Fig. 5. Effects of structure parameters of spiral-ring on the reflection loss of double layers metal spiral-ring with carbon fiber composite microwave absorber: (a) Initial length of line; (b) width of line; (c) thickness of upper dielectric layer螺旋环结构参数对双层螺旋环-碳纤维复合吸波体反射损耗的影响　(a)初始线长; (b)线宽; (c)损耗层厚度

Fig. 6. Spectrum feature of composite microwave absorber’s S parameter: (a) Amplitude; (b) phase 复合吸波体S参数的(a)幅值和(b)相位的频谱特性

Fig. 7. Spectrum feature of composite microwave absorber: (a) Complex impedance Z; (b) relative complex permittivity; (c) relative complex permeability; (d) complex refractive index 复合吸波体的(a) 复阻抗Z、(b) 复介电常数、(c)复磁导率和(d)复折射率的频谱特性

Fig. 8. Top view of electric field amplitude E distribution: (a) f₀₁ = 9.04 GHz; (b) f₀₂ =12.80 GHz; (c) f₀₃ = 16.48 GHz; (d) dielectric with dielectric loss with the same thickness (f₀₃ = 16.48 GHz) 电场强度E幅值分布俯视图　(a) f₀₁ = 9.04 GHz; (b) f₀₂ = 12.80 GHz; (c) f₀₃ = 16.48 GHz; (d)等厚度有耗介质(f₀₃ = 16.48 GHz)

Fig. 9. Top view of distribution for surface current density J : (a) f₀₄ = 11.12 GHz; (b) f₀₅ = 14.64 GHz 表面电流密度矢量J分布俯视图　(a) f₀₄ = 11.12 GHz; (b) f₀₅ = 14.64 GHz

Fig. 10. Comparison of f_0i and f_i (k = 1) . 复合吸波体f_0i与f_i (k = 1)的对比

Table 1. Calculation results of resonance frequency of composite microwave absorber.