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Fractal Order Dependent Frequency-Shifting of Perfect Absorber Based on Fractal Pattern Enabled Metasurface

In this paper, a broadband and high-absorption metamaterial absorber with fractal structure as pattern layer is presented. By studying the influence of characteristic parameters of fractal pattern on the microwave absorption performance, it is found that the fractal metasurface has a frequency-shifting characteristics. Based on this, the composite absorber model with fractal pattern is designed. Ansoft HFSS software based on the finite element method is used for modeling and optimization. The results show that the composite absorber achieves a near-perfect absorption rate over a broadband range. Then, the performance of the designed absorber is further verified by the power loss density distribution. The research and design method of this paper has potential application value in the radar-absorbing field.