A pure dielectric metamaterial absorber with broadband and thin thickness based on a cross-hole array structure

doi:10.1088/1674-1056/ac6492

Abstract A pure dielectric metamaterial absorber with broadband and thin thickness is proposed, whose structure is designed as a periodic cross-hole array. The pure dielectric metamaterial absorber with high permittivity is prepared by ceramic reinforced polymer composites. Compared with those with low permittivity, the absorber with high permittivity is more sensitive to structural parameters, which means that it is easier to optimize the equivalent electromagnetic parameters and achieve wide impedance matching by altering the size or shape of the unit cell. The optimized metamaterial absorber exhibits reflection loss below -10 dB in 7.93 GHz-35.76 GHz with a thickness of 3.5 mm, which shows favorable absorption properties under the oblique incidence of TE polarization (±45°). Whether it is a measured or simulated value, the strongest absorbing peak reaches below -45 dB, which exceeds that of most metamaterial absorbers. The distributions of power loss density and electric and magnetic fields are investigated to study the origin of their strong absorbing properties. Multiple resonance mechanisms are proposed to explain the phenomenon, including polarization relaxation of the dielectric and edge effects of the cross-hole array. This work overcomes the shortcomings of the narrow absorbing bandwidth of dielectrics. It demonstrates that the pure dielectric metamaterial absorber with high permittivity has great potential in the field of microwave absorption.

Keywords: dielectric metamaterial absorber

Received: 24 November 2021
Revised: 28 February 2022
Accepted manuscript online: 06 April 2022

PACS:	78.67.Pt	(Multilayers; superlattices; photonic structures; metamaterials)
	77.84.-s	(Dielectric, piezoelectric, ferroelectric, and antiferroelectric materials)
	41.20.Jb	(Electromagnetic wave propagation; radiowave propagation)
	42.25.Gy	(Edge and boundary effects; reflection and refraction)

Fund: Project supported in part by the Young Scientific and Technological Innovation Talents in Hunan, China (Grant No. 2021RC3003), the Science and Technology Plan Project of Hunan Province, China (Grant No. 2015TP1007), Initial Research Funding for Special Associate Professor by Central South University (Grant No. 202045002), and the National Natural Science Foundation for Young Scientists of China (Grant No. 51802353).

Corresponding Authors: Chao Jiang, Xiaozhong Huang
E-mail: jiangchao@csu.edu.cn;Huangxzh@csu.edu.cn

Cite this article:

Wenbo Cao(曹文博), Youquan Wen(温又铨), Chao Jiang(姜超), Yantao Yu(余延涛), Yiyu Wang(王艺宇), Zheyipei Ma(麻哲乂培), Zixiang Zhao(赵子翔), Lanzhi Wang(王兰志), and Xiaozhong Huang(黄小忠) A pure dielectric metamaterial absorber with broadband and thin thickness based on a cross-hole array structure 2022 Chin. Phys. B 31 117801

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A pure dielectric metamaterial absorber with broadband and thin thickness based on a cross-hole array structure

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