scholarly journals Design and Analysis of a Five-Band Polarization-Insensitive Metamaterial Absorber

2020 ◽  
Vol 2020 ◽  
pp. 1-12
Author(s):  
Han Wu ◽  
Shijun Ji ◽  
Ji Zhao ◽  
Chengxin Jiang ◽  
Handa Dai
Keyword(s):  
Dielectric Layer ◽  
Layer Structure ◽  
Surface Current ◽  
Metamaterial Absorber ◽  
Microwave Range ◽  
Absorption Mechanism ◽  
Resonant Frequencies ◽  
Resonator Structure ◽  
Dipole Resonance ◽  
Polarization Insensitive

A five-band metamaterial absorber (MMA) is presented. The proposed absorber consists of a three-layer structure of the top metal resonator, intermediate dielectric layer, and bottom metal plane. The top structure takes the centroid as the center and spreads out in a three-pronged shape with an average of 360°, and the ends bifurcate again. The calculation was carried out by the professional software to iteratively optimize the absorption effect of MMA in the microwave range. The results show that the MA has five peaks at resonant frequencies of 5.984 GHz, 12.232 GHz, 18.128 GHz, 18.414 GHz, and 20.592 GHz, with peaks of 0.9925, 0.9968, 0.9783, 0.9754, and 0.9975. By analyzing the electromagnetic field and surface current distribution of the absorber, the absorption mechanism is further verified, and the corresponding influence on the absorption spectrum is studied according to different polarization angles and incident angles. The effects of different resonator structure size and dielectric layer thickness on absorption rate were also discussed, and the distribution of electromagnetic fields is analyzed to reveal the existence of electric dipole resonance and magnetic resonance. Through comparing experiments and simulations, it is found that the peaks of the 1st, 2nd, and 5th have smaller absorption errors and frequency deviation, while the peaks of the 3rd and 4th have large ones. The five-band absorber has potential application in multiband electromagnetic stealth, bionic sensor, thermal radiation measuring instrument, and so on.

Design and Analysis of a Triple-band Non-zonal Polarization Electromagnetic Metamaterial Absorber

2021 ◽  
Vol 36 (6) ◽  
pp. 697-706
Author(s):  
Han Wu ◽  
Shijun Ji ◽  
Ji Zhao ◽  
Zhiyou Luo ◽  
Handa Dai
Keyword(s):  
Structural Parameters ◽  
Surface Current ◽  
Metamaterial Absorber ◽  
Copper Plate ◽  
Polarization Angle ◽  
Absorption Mechanism ◽  
Imaging Detector ◽  
Polarization Insensitive ◽  
Spectrum Imaging ◽  
Triple Band

A facile design of a novel triple-band electromagnetic metamaterial absorber (MMA) with polarization insensitive property is proposed in this paper. Each unit of the MMA consists of upper copper resonator and bottom copper plate with middle dielectric FR-4 between them. The MMA performs three absorption peaks at 16.919 GHz, 21.084 GHz and 25.266 GHz with absorption rates 99.90%, 97.76% and 99.18%, respectively. The influence of the main structural parameters on the frequencies and absorption rates is analyzed. The absorption mechanism of the absorber is explained by electric field, magnetic field and surface current distributions, which is supported by the electromagnetic parameters, affected with magnetic resonance. The polarization-insensitivity of TE wave is verified by observing the effects of the polarization angle change from 0-90º. The MMA can be applied in radiation, spectrum imaging detector, electromagnetic wave modulator, and so on.

scholarly journals Development of Single layered, Wide angle, Polarization insensitive Metamaterial Absorber

2021 ◽  
Vol 71 (03) ◽  
pp. 372-377
Author(s):  
Atipriya Sharma ◽  
Ravi Panwar ◽  
Rajesh Khanna
Keyword(s):  
Surface Current ◽  
Metamaterial Absorber ◽  
Absorption Mechanism ◽  
Design Variables ◽  
Proposed Model ◽  
Parametric Studies ◽  
Polarization Insensitive ◽  
Absorption Phenomenon ◽  
Current Electric Field ◽  
Measured Response

The simultaneous achievement of multiband absorption, polarisation-insensitive, and angularly stable absorber is a difficult job. Therefore, in this article, an efficient single-layered absorber is designed, critically analysed, fabricated, and experimentally validated. The proposed model incorporates eight sectors loaded a circle inside the square. The four discrete absorption peaks are observed at 4.4 GHz, 6.0 GHz, 14.1 GHz, and 16.0 GHz manifesting absorption intensities of 94%, 84%, 82%, and 92%, respectively. Parametric studies have been also exercised to investigate the influence of discrete geometrical design variables on the proposed absorber. The proposed structure is symmetrical in geometry, consequence in polarisation-independent behaviour. The absorption mechanism is also explained by analysing the surface current, electric field, and magnetic field distributions. Besides, the complex electromagnetic parameters are extracted to realise the absorption phenomenon. Additionally, to validate the simulated results, an optimal sample is fabricated and the measured response is well-matched with simulated ones.

scholarly journals A Switchable Ultra-Wideband Metamaterial Absorber with Polarization-Insensitivity and Wide-incident Angle at THz Band

2021 ◽  
Vol 8 ◽  
Author(s):  
Liansheng Wang ◽  
Dongyan Xia ◽  
Quanhong Fu ◽  
Xueyong Ding ◽  
Yuan Wang
Keyword(s):  
Incident Angle ◽  
Ground Plane ◽  
Surface Current ◽  
Dielectric Substrate ◽  
Metamaterial Absorber ◽  
Ultra Wideband ◽  
Absorption Mechanism ◽  
Te Mode ◽  
Polarization Insensitivity ◽  
High Absorption

In this paper, we report a switchable ultra-wideband metamaterial absorber with polarization-insensitivity and wide-incident angle at THz band which is composed of VO2 disk, polyimide dielectric substrate, and gold ground plane. The results show that the absorption is greater than 90% from 3.5–8 THz for a temperature of 300 K and this absorption band disappears when the temperature rises to 350 K. The absorption property of our proposed metamaterial absorber is insensitive to polarization states and angles and it can withhold high absorption of more than 80% for wide-incident angles, up to 60° for TE mode and TM mode. The wideband absorption mechanism is elucidated using an effective medium and surface current analysis.

scholarly journals Ultra-Wideband Flexible Absorber in Microwave Frequency Band

Materials ◽  
2020 ◽  
Vol 13 (21) ◽  
pp. 4883
Author(s):  
Shicheng Fan ◽  
Yaoliang Song
Keyword(s):  
Dielectric Layer ◽  
Incident Angle ◽  
Microwave Frequency ◽  
Ultra Wideband ◽  
Metal Ring ◽  
Absorption Mechanism ◽  
Low Profile ◽  
Measurement Results ◽  
Flexible Printed Circuit ◽  
Polarization Insensitive

In this paper, an ultra-wideband flexible absorber is proposed. Based on a summary of the absorption mechanism, using lossless air to replace the heavy lossy dielectric layer will not substantially impact the absorption. The dielectric layer is only a thin layer of polyimide. The proposed absorber is a sandwich structure. The surface is a layer of copper metal ring and wire, and it is loaded with chip resistors to expand the absorber bandwidth. Simulated results show that the bandwidth of the proposed absorber, with an absorptivity of more than 90%, is 2.55–10.07 GHz, with a relative bandwidth over 119.2%. When the electromagnetic wave has a wide incident angle, the absorber still maintains a high absorption. This absorber has been fabricated by FPC (flexible printed circuit) technology. The proposed absorber was attached to the cylinder and measured. The measurement results are roughly the same as the simulation results. The fabricated absorber is easy to carry and flexible, such that it can easily be conformed to irregular objects. The proposed absorber is polarization-insensitive, low profile, thin, and portable, so it is easier to apply in a variety of practical fields.

scholarly journals Design and Fabrication of a Triple-Band Terahertz Metamaterial Absorber

Nanomaterials ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 1110
Author(s):  
Jinfeng Wang ◽  
Tingting Lang ◽  
Zhi Hong ◽  
Meiyu Xiao ◽  
Jing Yu
Keyword(s):  
Optical Communication ◽  
Transverse Magnetic ◽  
Metamaterial Absorber ◽  
Absorption Mechanism ◽  
Symmetric Configuration ◽  
Electric And Magnetic Fields ◽  
Polarization Insensitive ◽  
Band Absorption ◽  
High Absorption ◽  
Triple Band

We presented and manufactured a triple-band terahertz (THz) metamaterial absorber with three concentric square ring metallic resonators, a polyethylene terephthalate (PET) layer, and a metallic substrate. The simulation results demonstrate that the absorptivity of 99.5%, 86.4%, and 98.4% can be achieved at resonant frequency of 0.337, 0.496, and 0.718 THz, respectively. The experimental results show three distinct absorption peaks at 0.366, 0.512, and 0.751 THz, which is mostly agreement with the simulation. We analyzed the absorption mechanism from the distribution of electric and magnetic fields. The sensitivity of the three peaks of this triple-band absorber to the surrounding is 72, 103.5, 139.5 GHz/RIU, respectively. In addition, the absorber is polarization insensitive because of the symmetric configuration. The absorber can simultaneously exhibit high absorption effect at incident angles up to 60° for transverse electric (TE) polarization and 70° for transverse magnetic (TM) polarization. This presented terahertz metamaterial absorber with a triple-band absorption and easy fabrication can find important applications in biological sensing, THz imaging, filter and optical communication.

scholarly journals Ultrathin Dual-band Metamaterial Absorber

2021 ◽  
Author(s):  
Huan Liu ◽  
Rui Wang ◽  
Junyao Wang ◽  
Tianhong Lang ◽  
Bowen Cui
Keyword(s):  
Simple Structure ◽  
Structural Parameters ◽  
Metamaterial Absorber ◽  
Ring Resonators ◽  
Dual Band ◽  
Absorption Mechanism ◽  
Split Ring ◽  
Absorption Frequency ◽  
Polarization Insensitive ◽  
High Absorption

Abstract In this paper, an ultrathin dual-band metamaterial absorber (MMA) is designed. Its top layer consists of two nested split-ring resonators. The calculation result demonstrates that there are two distinct absorption peaks, which are 9.258GHz and 21.336GHz, with absorption rate of 99.78% and 96.91%. It also show polarization-insensitive for normal incident and its thickness is only 1.96% of the wavelength of its lowest absorption frequency. Moreover, we explore the MMA’s absorption mechanism and analyze the influence of main structural parameters on the MMA’s absorption characteristics. The proposed MMA has simple structure and high absorption, it can be applied in electromagnetic stealth, bolometers, sensor and other fields.

Experimental verification of super-compact ultra-wideband (UWB) polarization and incident angle-independent metamaterial absorber

2020 ◽  
pp. 1-11
Author(s):  
Manpreet Kaur ◽  
Hari Shankar Singh
Keyword(s):  
Incident Angle ◽  
Low Cost ◽  
Surface Current ◽  
Cost Effective ◽  
Normal Incidence ◽  
Metamaterial Absorber ◽  
Capacitive Coupling ◽  
Ultra Wideband ◽  
Absorption Mechanism ◽  
The Stability

Abstract In this paper, a super-compact ultra-wideband (UWB) metamaterial absorber (MMA) is presented. The absorber design consists of an inverted L-shaped structure and a diagonal rectangular-shaped structure. The capacitive coupling between these two structures not only provides UWB nature but also provides a super-compact absorber design. The dimension of the unit cell arrangement is 5 × 5 mm2 and printed on a low-cost FR-4 substrate of thickness 1.54 mm (0.061λlowest). The design absorber provides more than 97% absorptivity from 12 to 21 GHz for normal incidence electromagnetic (EM) wave. However, the proposed MMA has a full width at half maximum absorption bandwidth of 11.71 GHz from 10.34 to 22.05 GHz. Moreover, the surface current distributions have been analyzed to understand the absorption mechanism of the MMA. The stability of the proposed design is validated with different incident angles (for TE and TM modes) and different polarization angles. Finally, the absorber design is fabricated and verified experimentally. Furthermore, the UWB frequency range, high absorption, ease in design and fabrication, and cost-effective make it suitable for different quality applications in stealth technology, thermal imaging, radar detection, antenna systems, and other EM devices.

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