scholarly journals Polarization insensitive switchable metamaterial absorber/reflector for X-band applications

2020 ◽  
Vol 9 (6) ◽  
pp. 2443-2448
Author(s):  
M. G. Mustapha ◽  
M. K. A. Rahim ◽  
N. A. Murad ◽  
O. Ayop ◽  
S. Tuntrakool ◽  
...  
Keyword(s):  
Copper Wire ◽  
Operation Mode ◽  
Metamaterial Absorber ◽  
Unit Cell ◽  
The Other ◽  
Circular Shape ◽  
At Resonance ◽  
X Band ◽  
Shape Structure ◽  
Polarization Insensitive

A unit cell of squared shaped polarization-insensitive switchable metamaterial absorber/reflector is presented. The structure operates at 10.20 GHz under both absorber mode and reflector mode configurations. Copper wire bridging the gaps to form a circular shape structure were used as switches for operation mode selections. The structure was designed on an FR4 substrate, and the incidental wave angles were varied from 0 to 50 degrees. The structure demonstrated almost 100% absorption at resonance, 3.314 GHz percentage bandwidth at 80% as an absorber. On the other hand, as reflector, it demonstrated almost a 90% reflection and a usable bandwidth of 3.327 GHz.

Frequency Reconfigurable Epsilon Negative Metamaterial Antenna

2017 ◽  
Vol 7 (3) ◽  
pp. 1473
Author(s):  
Arrauzah Razak ◽  
M. K. A. Rahim ◽  
H. A. Majid ◽  
N. A. Murad
Keyword(s):  
Electric Field ◽  
Resonance Frequency ◽  
Software Tool ◽  
Unit Cell ◽  
Reconfigurable Antenna ◽  
Circular Shape ◽  
At Resonance ◽  
Metamaterial Antenna ◽  
Frequency Reconfigurable Antenna ◽  
Radius Size

This paper proposes metamaterial (MTM) inspired frequency reconfigurable antenna based on thecircular electric field coupled (ELC) resonator. It is composed of circular shape ELC resonator with the radius size of 7 mm. By inserting two switches between the gaps at both side of the circular ELC resonator, it is possible to switch ON or OFF the unit cell. The antenna has been simulated using CST Microwave Studio software tool. The simulation result shows that the proposed antenna is capable of reconfiguring between two different frequencies which are2.18 GHz and 2.64 GHz. The simulated bandwidth at -10 dB is 4.12 % at resonance frequency of 2.18 GHz and 8.7% at 2.64 GHz

scholarly journals Polarization-Independent Ultra-Wideband Metamaterial Absorber for Solar Harvesting at Infrared Regime

Materials ◽  
2020 ◽  
Vol 13 (11) ◽  
pp. 2560 ◽  
Author(s):  
Asraful Alam ◽  
Sikder Sunbeam Islam ◽  
Md. Hobaibul Islam ◽  
Ali F. Almutairi ◽  
Mohammad Tariqul Islam
Keyword(s):  
Solar Spectrum ◽  
Equivalent Circuit Model ◽  
Metamaterial Absorber ◽  
Simulation Software ◽  
Unit Cell ◽  
Ultra Wideband ◽  
Scattering Parameters ◽  
Frequency Range ◽  
Relative Bandwidth ◽  
Polarization Insensitive

This paper presents an ultra-wideband metamaterial absorber for solar harvesting in the infrared regime (220–360 THz) of the solar spectrum. The proposed absorber consists of square-shaped copper patches of different sizes imposed on a GaAs (Gallium arsenide) substrate. The design and simulation of the unit cell are performed with finite integration technique (FIT)-based simulation software. Scattering parameters are retrieved during the simulation process. The constructed design offers absorbance above 90% within a 37.89% relative bandwidth and 99.99% absorption over a vast portion of the investigated frequency range. An equivalent circuit model is presented to endorse the validity of the proposed structure. The calculated result strongly agrees with the simulated result. Symmetrical construction of the proposed unit cell reports an angular insensitivity up to a 35° oblique incidence. Post-processed simulation data confirm that the design is polarization-insensitive.

scholarly journals Polarization-Independent and Angle-Insensitive Metamaterial Absorber Using 90-Degree-Rotated Split-Ring Resonators

2015 ◽  
Vol 2015 ◽  
pp. 1-6 ◽  
Author(s):  
Jia-Qi Feng ◽  
Wei-Dong Hu ◽  
Qing-Le Zhang ◽  
Hua Zong ◽  
Hui Huang ◽  
...  
Keyword(s):  
Incident Angle ◽  
Metamaterial Absorber ◽  
Ring Resonators ◽  
Naval Research ◽  
Split Ring ◽  
Split Ring Resonators ◽  
Full Wave ◽  
X Band ◽  
Polarization Insensitive ◽  
Polarization Independent

We present the design, simulation, and measurement of a polarization-independent and angle-insensitive metamaterial absorber (MA) in X-band. Since the unit cell of the MA consists of four subwavelength split-ring resonators with 4-fold symmetric rotation, the MA is insensitive to the variation of both polarization and incident angle of the planar electromagnetic wave. The electromagnetic performances of the MA are studied by full-wave simulations based on finite-element method and the Naval Research Laboratory arch experimental measurements. The electric field distributions are numerically investigated, which confirm the polarization-insensitive property of the MA, as expected from the symmetric nature of the structure. When the incident angles vary from 0 to 45 degrees, the MA remains at full width at half maximum of 0.4 GHz (0.5 GHz) with peak absorptions of 99.9% (95.2%) at 10.27 GHz (10.3 GHz) by simulations (measurements).

Design and analysis of an ultrathin X-band polarization-insensitive metamaterial absorber

2016 ◽  
Vol 58 (10) ◽  
pp. 2481-2485 ◽  
Author(s):  
Sreenath Reddy Thummaluru ◽  
Naveen Mishra ◽  
Raghvendra Kumar Chaudhary
Keyword(s):  
Metamaterial Absorber ◽  
X Band ◽  
Polarization Insensitive
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