Flexible Metamaterial Absorber with Tailored Bandwidth and High Absorption Performance

Haiyu Zheng,Liangyao Chen,Young-Pak Lee

doi:10.3390/cryst12020182

Haiyu Zheng, Liangyao Chen + Show 1 more

Open Access

https://doi.org/10.3390/cryst12020182

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Journal: Crystals	Publication Date: Jan 26, 2022
Citations: 7	License type: CC BY 4.0

Affiliation: Hanyang University, Fudan University

Abstract

Different from previous works which have focused on broadening the bandwidth, we propose an electromagnetic absorber with a medium and tailored bandwidth absorption, which avoids the unnecessary absorption caused by the too-wide bandwidth. Nevertheless, absorption is extremely high to be more than 99% and 97% for the normal and even oblique (45°) incidence, respectively, in a tailored frequency range of 5.8 ± 0.25 GHz even for both TE and TM polarization. This means the absorber is insensitive to the polarization of incident electromagnetic wave. Furthermore, it is flexible, since the main portion of sample is soft and flexible polyimide. The same properties are also realized in a range of 10 ± 0.5 GHz through adjusting the parameters of structure. The center frequencies of 5.8 and 10 GHz are very useful in our daily life, and the cost of absorber is relative low. Therefore, we believe the absorber can be used in many practical fields such as vehicle high-pass applications and radars.

Highlights

Metamaterials as artificial material open a door to the versatile and advanced applications of electromagnetic (EM) wave, due to their unique double-negative refractive properties [1]
The frequency range of adjusted EM wave is from MHz to the visible light, which depends on mainly the structure and the material properties
The absorpincident angle of 0) and bandwidth, is tion turns out to be insensitive to the polarization of incident EM wave as shown in Figure revealed to be 5.54–6.05 GHz

Summary

Introduction

Metamaterials as artificial material open a door to the versatile and advanced applications of electromagnetic (EM) wave, due to their unique double-negative refractive properties [1]. Speaking, they are fabricated so that the unit cells are arranged periodically, and the scale of unit cell is smaller than the wavelength of incident wave. In other words, by adjusting the structural parameters in the same shape, this can be employed for a frequency range of 9.5–10.5 GHz. The unit-cell structure consisted of 5 layers, as shown, which are copper meta-pattern, polyimide 1, resistive sheet, polyimide 2, and continuous copper layers in order.

Results and Discussion

Absorption

Absorption spectra by varying theexisting thickness polyimide

Conclusions