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MULTI-BAND AND POLARIZATION INSENSITIVE METAMATERIAL ABSORBER
Abstract -
The design and realization of a multi-band and polarization insensitive metamaterial absorber is presented.
The structure with thickness 1.1 mm consists of six close rings which distribute in two metallic layers separated by FR4 fiber glass PCB substrates. Experimental results show that over 93.3% absorption can be achieved
in this metamaterial absorber at multiple frequency bands (more than two). Due to the rotational symmetric pattern of the metamaterial, the performance of the absorber is insensitive to the polarization of
the incident waves, indicating the superiority of the structure in the application.
1. INTRODUCTION
Metamaterials [1{25] have been used to design absorber structure for many years. It utilized artificial structures with the dimensions much smaller than the working wavelength to get a high absorption. Owing
to its absorption properties, metamaterial absorbers were achieved in the microwave region [4{10], terahertz region [11{15], and visible frequencies [16{19]. The performance of the metamaterial absorber, in particular the bandwidth and the sensitivity to the polarization of the incident wave, has attracted more and more attentions. Dual band metamaterial absorber was presented in [4] with an absorption of 90% in the lower frequency band and an absorption of 92% in the higher frequency band. The bandwidth of the absorber was also improved in Ref. [11, 12] with numerical confirmation. However, the performance of the metamaterial absorber, e.g., the bandwidth and the sensitivity to the incident electric polarization, are still calling for improvement.
http://www.jpier.org/PIER/pier113/06.10122401.pdf
Abstract -
The design and realization of a multi-band and polarization insensitive metamaterial absorber is presented.
The structure with thickness 1.1 mm consists of six close rings which distribute in two metallic layers separated by FR4 fiber glass PCB substrates. Experimental results show that over 93.3% absorption can be achieved
in this metamaterial absorber at multiple frequency bands (more than two). Due to the rotational symmetric pattern of the metamaterial, the performance of the absorber is insensitive to the polarization of
the incident waves, indicating the superiority of the structure in the application.
1. INTRODUCTION
Metamaterials [1{25] have been used to design absorber structure for many years. It utilized artificial structures with the dimensions much smaller than the working wavelength to get a high absorption. Owing
to its absorption properties, metamaterial absorbers were achieved in the microwave region [4{10], terahertz region [11{15], and visible frequencies [16{19]. The performance of the metamaterial absorber, in particular the bandwidth and the sensitivity to the polarization of the incident wave, has attracted more and more attentions. Dual band metamaterial absorber was presented in [4] with an absorption of 90% in the lower frequency band and an absorption of 92% in the higher frequency band. The bandwidth of the absorber was also improved in Ref. [11, 12] with numerical confirmation. However, the performance of the metamaterial absorber, e.g., the bandwidth and the sensitivity to the incident electric polarization, are still calling for improvement.
http://www.jpier.org/PIER/pier113/06.10122401.pdf
