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Frontiers of Optoelectronics

Front. Optoelectron.    2017, Vol. 10 Issue (2) : 124-131     DOI: 10.1007/s12200-017-0682-z
RESEARCH ARTICLE |
Broadband and conformal metamaterial absorber
Xiangkun KONG1,2(), Junyi XU1, Jin-jun MO3, Shaobin LIU1
1. Key Laboratory of Radar Imaging and Microwave Photonics, Ministry of Education, College of Electronic and Information Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
2. State Key Laboratory of Millimeter Waves, Southeast University, Nanjing 210096, China
3. College of Electronic Science and Engineering, National University of Defense Technology, Changsha 410073, China
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Abstract

In this study, a new broadband and conformal metamaterial absorber using two flexible substrates was proposed. Simulation results showed that the proposed absorber exhibited an absorption band from 6.08 to 13.04 GHz and a high absorption of 90%, because it was planar. The absorber was broadband as its relative absorption bandwidth was 72.8%. Moreover, the proposed absorber was insensitive to the polarization of the TE and TM waves. The absorber was ultra-thin; its total thickness was only 0.07λ at the lowest operating frequency. Furthermore, different regions of absorption can be adjusted by lumping and loading two resistors onto the polyimide film, respectively. Moreover, compared with the conventional microwave absorber, the absorption bandwidth of the proposed absorber can be broadened and enhanced when it was bent and conformed to the surface of objects. Experimental and simulation results were in agreement. The proposed absorber is a promising absorbing element in scientific and technical applications because of its broadband absorption, polarization insensitivity, and flexible substrates.

Keywords absorber      metamaterials      flexible      broadband      conformal     
Corresponding Authors: Xiangkun KONG   
Just Accepted Date: 28 March 2017   Online First Date: 17 April 2017    Issue Date: 05 July 2017
 Cite this article:   
Xiangkun KONG,Junyi XU,Jin-jun MO, et al. Broadband and conformal metamaterial absorber[J]. Front. Optoelectron., 2017, 10(2): 124-131.
 URL:  
http://journal.hep.com.cn/foe/EN/10.1007/s12200-017-0682-z
http://journal.hep.com.cn/foe/EN/Y2017/V10/I2/124
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Xiangkun KONG
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Shaobin LIU
Fig.1  (a) Top view of the conformal absorber; (b) side view of the conformal absorber; (c) resonator patterned on a PI film; (d) simulated and measured absorption with respect to the frequency; (e) calculated real and imaginary parts of the impedance
Fig.2  Simulated absorptions for different angles of incidence for (a) TE and (b) TM polarizations
Fig.3  Simulated absorptions for different values of (a) geometric parameter a1 and (b) resistor R1
Fig.4  Simulated current distributions on the surface at the three resonance frequencies: (a)–(c) top view and (d)–(f) central cross section
Fig.5  (a) Photograph of the fabricated measurement sample; (b) planar measurement environment
Fig.6  Measured absorptions at different incident angles (0°– 60°) of the incident wave
Fig.7  (a) Sample conformed to the surface of the cylinder; (b) conformal measurement at different central angles (α = 60°–180°)
Fig.8  Measured absorptions at different central angles (α = 60°–180°)
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