≈ 1) and broad frequency bandwidth. The coin-like porous structure can induce multiple scattering and extend the travel path of the waves, which is in favour of electromagnetic loss. In this way, the effective frequency bandwidth (RL < -10 dB) as large as 6 GHz (from 11.36 to 17.36 GHz) has been achieved at a thickness of 2 mm when the Fe/Co molar ratio is 4 : 6. In addition, the average frequency broadband reached 5.57 GHz in the thickness range of 2-2.6 mm. We believe that this study may provide a new strategy for tuning the impedance matching for optimal broadband absorbers.
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Li et al. (2017) studied this question.
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