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.

A Multiple-Bands Metamaterial Absorber Based in X, Ku and K-Band

2021 ◽  
Author(s):  
Muhammad Fahim Zafar ◽  
Usman Masud
Keyword(s):  
Single Layer ◽  
Wide Band ◽  
Metamaterial Absorber ◽  
Basic Unit ◽  
Frequency Range ◽  
Structure Form ◽  
Perfect Absorption ◽  
Polarization Insensitive ◽  
Band Absorption ◽  
K Band

Abstract Developing a highly efficient and multiple-bands metamaterial absorber is a hot issue in recent era. In this paper, A multiple-bands metamaterial absorber has been presented which is based in X, Ku and K-band. Firstly, we have designed two single layer basic unit cell of X-shape and cross-shape, then they are arranged in the multi-layers structure form for the purpose of obtaining multiple- bands and wide band absorption. The proposed absorber is able to work in multiple bands because it has six peaks in the frequency range of 8–24 GHz with having near perfect absorption. Moreover, the sixth peak has a wideband absorption which is 2.93 GHz. Furthermore, the proposed absorber is also tested for polarization insensitivity and also for oblique incidence. Absorption was found polarization insensitive with almost perfect absorption.

Bandwidth-enhanced polarization-insensitive microwave metamaterial absorber and its equivalent circuit model

2014 ◽  
Vol 115 (10) ◽  
pp. 104503 ◽  
Author(s):  
Saptarshi Ghosh ◽  
Somak Bhattacharyya ◽  
Yadunath Kaiprath ◽  
Kumar Vaibhav Srivastava
Keyword(s):  
Equivalent Circuit ◽  
Equivalent Circuit Model ◽  
Metamaterial Absorber ◽  
Circuit Model ◽  
Polarization Insensitive

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.

scholarly journals Ultra Wideband Coplanar Waveguide Antenna with an Improved Gain using a Frequency Selective Surfaces (FSS)

2019 ◽  
Vol 8 (9S) ◽  
pp. 145-149
Keyword(s):  
Time Domain ◽  
Coplanar Waveguide ◽  
Unit Cell ◽  
Ultra Wideband ◽  
Frequency Range ◽  
Rectangular Slot ◽  
Improved Performance ◽  
Set Up ◽  
The Time Domain ◽  
Uwb Applications

In this article, an ultra-wideband FSS reflector has been proposed to enhance the gain of a CPW antenna for UWB applications. A CPW fed antenna having dimensions of 38mm×38mm×1.605mm and FSS unit cell having dimensions 14mm × 14mm × 1.605 mm are presented in the paper. A rectangular slot and stubs are interleaved at the outer edges of the patch for achieving desired characteristics of an ultra-wideband for the frequency range of 3.39 GHz to 12.9 GHz. Simulation results carried out using the CST microwave 2016 version in the time domain are presented for the proposed antenna. An FSS unit cell designed and simulated using periodic boundary conditions and floquet ports is presented. The combined setup of an array of FSS reflector behind the antenna has been simulated in the time domain. This set up shows an improved performance in terms of antenna’s gain. A maximum and minimum gain of 8.14 dB and 4.98 dB has been observed with the presence of FSS reflector behind the coplanar waveguide antenna. A significant improvement of 2.9 dB has been observed over the entire band of antenna’s operation

scholarly journals A 2-Bit Pancharatnam-Berry Coding Metasurface For Ultra-Wideband And Polarization-Insensitive RCS Reduction

2021 ◽  
Author(s):  
Baoqin Lin ◽  
Wenzhun Huang ◽  
Yong-sheng Yang ◽  
Lin-tao Lv ◽  
Jianxin Guo ◽  
...  
Keyword(s):  
Reflection Coefficient ◽  
Cross Section ◽  
Ultra Wideband ◽  
Polarization Conversion ◽  
Metallic Plate ◽  
Excellent Performance ◽  
Unit Structure ◽  
Relative Bandwidth ◽  
Simulation And Experiment ◽  
Polarization Insensitive

Abstract Because Pancharatnam-Berry (PB) geometrical phase can only be generated in the co-polarized reflection coefficient under circular polarized (CP) incidence for a reflective metasurface, designing a reflective PB coding metasurface must be based on an appropriate polarization conversion metasurface (PCM), which can realize CP-maintaining reflection. In this work, to design a reflective 2-dit PB coding metasurface for radar cross section (RCS) reduction, an ultra-wideband PCM is proposed at first, the simulated results show that the PCM can realize ultra-wideband CP-maintaining reflection from 8.6 to 35.9 GHz; moreover, PB phase will be generated in its co-polarized reflection coefficient by rotating its unit structure. Thus based on the PCM, an ultra-wideband reflective 2-dit PB coding metasurface is constructed successfully. The simulation and experiment results show that the coding metasurface has excellent performance in RCS reduction under arbitrary polarized incidences, compared with a pure metallic plate with the same size, its RCS can be reduced more than 10dB in the frequency band 8.2-35.2GHz with a relative bandwidth of 124.4%.

Polarization-insensitive metamaterial absorber of selective response in terahertz frequency range

2014 ◽  
Vol 16 (10) ◽  
pp. 105104 ◽  
Author(s):  
B Grześkiewicz ◽  
A Sierakowski ◽  
J Marczewski ◽  
N Pałka ◽  
E Wolarz
Keyword(s):  
Metamaterial Absorber ◽  
Terahertz Frequency ◽  
Frequency Range ◽  
Terahertz Frequency Range ◽  
Polarization Insensitive

scholarly journals Toward an Ultra-Wideband Hybrid Metamaterial Based Microwave Absorber

Micromachines ◽  
2020 ◽  
Vol 11 (10) ◽  
pp. 930
Author(s):  
Aicha El Assal ◽  
Hanadi Breiss ◽  
Ratiba Benzerga ◽  
Ala Sharaiha ◽  
Akil Jrad ◽  
...  
Keyword(s):  
Dielectric Layer ◽  
Ground Plane ◽  
Transverse Magnetic ◽  
Metamaterial Absorber ◽  
Microwave Absorber ◽  
Ultra Wideband ◽  
Periodic Pattern ◽  
Frequency Range ◽  
Coupled Resonators ◽  
Weight Percentage

In this paper, we propose a novel design of an ultra-wideband hybrid microwave absorber operating in the frequency range between 2 GHz and 18 GHz. This proposed hybrid absorber is composed of two different layers that integrate a multiband metamaterial absorber and a lossy dielectric layer. The metamaterial absorber consists of a periodic pattern that is composed of an arrangement of different scales of coupled resonators and a metallic ground plane, and the dielectric layer is made of epoxy foam composite loaded with low weight percentage (0.075 wt.%) of 12 mm length carbon fibers. The numerical results show a largely expanded absorption bandwidth that ranges from 2.6 GHz to 18 GHz with incident angles between 0° and 45° and for both transverse electric and transverse magnetic waves. The measurements confirm that absorption of this hybrid based metamaterial absorber exceeds 90% within the above-mentioned frequency range and it may reach an absorption rate of 99% for certain frequency ranges. The proposed idea offers a further step in developing new electromagnetic absorbers, which will impact a broad range of applications.

scholarly journals Ultra-Wideband Dielectric Resonator Antenna Design Based on Multilayer Form

2019 ◽  
Vol 2019 ◽  
pp. 1-10
Author(s):  
Fan Wang ◽  
Chuanfang Zhang ◽  
Houjun Sun ◽  
Yu Xiao
Keyword(s):  
Dielectric Resonator ◽  
Linear Array ◽  
Ultra Wideband ◽  
Operating Frequency ◽  
Cross Polarization ◽  
Dielectric Resonator Antenna ◽  
Frequency Range ◽  
Scanning Angle ◽  
Operating Frequency Range ◽  
Relative Bandwidth

In this paper, an ultra-wideband dielectric resonator antenna (DRA) is investigated. It basically covers the bandwidth from 6 GHz to 16 GHz and achieves a relative bandwidth of 90.9%. It is found that a wide bandwidth can be reached with a small DRA by adopting multilayer form. Thus, the dimension of the designed DRA element which is composed of nine-element phased-scanning linear array is as small as 6.9mm x 8.2mm x 11 mm. While the maximum stable zenith gain is 6.2dB, the lobe width is 3 dB. The operating frequency range of the antenna array is from 5.42GHz to 16.5GHz, achieving a 101.1% relative bandwidth. A large scanning angle of ±60° is realized within the operating frequency band, with good scanning pattern and cross polarization. To verify the design and simulation, a 1 × 9 DRA array is fabricated, and measurements are carried out.

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