Abstract:
Background In the design process of microwave absorbing structures, due to the larger wavelength of low-frequency electromagnetic waves, the thickness of the corresponding absorbing body also increase. Therefore, achieving low-frequency broadband absorption in the microwave band with a thin thickness is a challenge.
Purpose To address the technical bottleneck of limited bandwidth in thin microwave absorbing materials at low frequencies this study proposes a new absorbing body design scheme based on a double-layer magnetic medium and a mortise structure, focusing on breaking through the constraint between material thickness and absorption bandwidth to achieve efficient absorption of electromagnetic waves in the L/S frequency bands.
Methods The metamaterial is constructed with a double-layer structure using magnetic materials, combined with periodically arranged mortise-type metal resonant units on the swface, and utilizes the synergistic effect of magnetic loss and structural resonance to enhance electromagnetic energy dissipation.
Results Simulation results show that within the working frequency band, there are two absorption peaks at 1.36 GHz and 2.29 GHz, and the absorption rate exceeds 90% in the frequency range of 1.16-2.82 GHz, effectively covering the L band and extending to part of the S band. Under thin-layer conditions, it achieves a wideband absorption of 1.66 GHz, resolving the inherent contradiction between thickness and bandwidth of low-frequency absorbing materials.
Conclusions The novel metamaterial absorber based on double magnetic media and mortise structure can provide a feasible solution for the engineering application of the next-generation thin broadband absorbing bodies.
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