scholarly journals A new double ш-shaped compact negative refractive index metamaterial for wideband applications

2020 ◽  
Vol 20 (2) ◽  
pp. 863
Author(s):  
Pujan Chandra Paul ◽  
Mohammad Jakir Hossain ◽  
Ashish Kumar Karmaker ◽  
Md. Jakirul Islam
Keyword(s):  
Refractive Index ◽  
Wave Propagation ◽  
Material Properties ◽  
Negative Refractive Index ◽  
Simulation Software ◽  
Unit Cell ◽  
Electromagnetic Simulation ◽  
Vertical Array ◽  
Array Structure ◽  
Compact Design

<p>This paper analyzed the new compact design and negative refractive index (NRI) metamaterial for wideband applications. The proposed metamaterial exhibits NRI and wideband characteristics of the x-axis wave propagation. It displayed the NRI property at the frequency of 1.54 GHz and wideband from 1.26 GHz to 7.08 GHz frequency (L, S, and C band). Moreover, the response of the 1×2 horizontal and 2×1 vertical array structure showed the wideband frequency in the 7.17 GHz to 13.62 GHz and 1.46 GHz to 9.53 GHz, respectively. Electromagnetic simulation software called CST has been used to design the metamaterial unit cell. The metamaterial has been displayed the multi-band characteristics such as L, S, C, X and K<sub>u</sub> bands with negative index material properties.</p>

Analysis and Design of High Gain NRI Superstrate Based Antenna for RF Energy Harvesting System

2016 ◽  
Vol 2 (3) ◽  
pp. 647
Author(s):  
K.K.A. Devi ◽  
C. H. Ng
Keyword(s):  
Refractive Index ◽  
Negative Refractive Index ◽  
Effective Permittivity ◽  
Resonant Cavity ◽  
High Gain ◽  
Split Ring Resonator ◽  
Unit Cell ◽  
Impedance Match ◽  
Strip Line ◽  
Analysis And Design

<p>A high gain patch antenna inspired by 4 layers of negative refractive index (NRI) metamaterial superstrate is proposed to operate at downlink radio frequency (RF) band (935 MHz to 960 MHz of GSM 900). The metamaterial unit cell consists of a nested split ring resonator (SRR) and strip line laminated on other side of FR4 substrate. The effective permittivity and permeability of the proposed unit cell are designed synchronously to approach zero, which leads the NRI superstrate to have impedance match with zero and negative refractive index.The NRI superstrate is studied using Fabry-Perot (F-P) resonant cavity. The gain is improved by 82.48% at the air gap of 55 mm in the desired frequency band.Therefore, the gain of the antenna is effectively enhanced based on the negative refractive index metamaterial. The measured radiation pattern and S parameter results also showed that it has good agreement with the simulation results.</p>

scholarly journals Metamaterial Cell-Based Superstrate towards Bandwidth and Gain Enhancement of Quad-Band CPW-Fed Antenna for Wireless Applications

Sensors ◽  
2020 ◽  
Vol 20 (2) ◽  
pp. 457 ◽  
Author(s):  
Samir Salem Al-Bawri ◽  
Md Shabiul Islam ◽  
Hin Yong Wong ◽  
Mohd Faizal Jamlos ◽  
Adam Narbudowicz ◽  
...  
Keyword(s):  
Refractive Index ◽  
Wave Propagation ◽  
Negative Refractive Index ◽  
Coplanar Waveguide ◽  
Ring Resonators ◽  
Wireless Applications ◽  
Gain Enhancement ◽  
Wide Range ◽  
Measurement Results ◽  
High Bandwidth

A multiband coplanar waveguide (CPW)-fed antenna loaded with metamaterial unit cell for GSM900, WLAN, LTE-A, and 5G Wi-Fi applications is presented in this paper. The proposed metamaterial structure is a combination of various symmetric split-ring resonators (SSRR) and its characteristics were investigated for two major axes directions at (x and y-axis) wave propagation through the material. For x-axis wave propagation, it indicates a wide range of negative refractive index in the frequency span of 2–8.5 GHz. For y-axis wave propagation, it shows more than 2 GHz bandwidth of near-zero refractive index (NZRI) property. Two categories of the proposed metamaterial plane were applied to enhance the bandwidth and gain. The measured reflection coefficient (S11) demonstrated significant bandwidths increase at the upper bands by 4.92–6.49 GHz and 3.251–4.324 GHz, considered as a rise of 71.4% and 168%, respectively, against the proposed antenna without using metamaterial. Besides being high bandwidth achieving, the proposed antenna radiates bi-directionally with 95% as the maximum radiation efficiency. Moreover, the maximum measured gain reaches 6.74 dBi by a 92.57% improvement compared with the antenna without using metamaterial. The simulation and measurement results of the proposed antenna show good agreement.

Negative index from asymmetric metallic cut wire pairs metamaterials

2009 ◽  
Vol 1 (6) ◽  
pp. 521-527 ◽  
Author(s):  
Shah Nawaz Burokur ◽  
André de Lustrac
Keyword(s):  
Refractive Index ◽  
Material Properties ◽  
Negative Refractive Index ◽  
Negative Permittivity ◽  
Inversion Method ◽  
Experimental Measurements ◽  
Negative Index ◽  
Transmission And Reflection

Metamaterials made of exclusively metallic cut wire pairs have been experimentally demonstrated to exhibit a negative refractive index at optical frequencies. However, other related works on slightly different wire and plate pairs have not shown a negative index. In this paper, we present the analogy between previously reported S-shaped metamaterials and asymmetric cut wire pairs by a simple unifying approach. These two structures present a negative index for some geometrical configurations. Using simulations and experimental measurements in the microwave domain, we investigate the material properties of the last structure. Applying the inversion method from transmission and reflection responses, we show that a negative index is exhibited due to simultaneous negative permittivity ε and permeability μ. A negative index n is experimentally verified in a bulk prism engineered by stacking several layers of the metamaterial.

scholarly journals Parametric Analysis of Negative and Positive Refractive Index Lens Antenna by ANSYS HFSS

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Phan Van Hung ◽  
Nguyen Quoc Dinh ◽  
Yoshihide Yamada ◽  
Naobumi Michishita ◽  
Mohammad Tariqul Islam
Keyword(s):  
Refractive Index ◽  
Parametric Analysis ◽  
Negative Refractive Index ◽  
Theoretical Calculations ◽  
Base Station ◽  
Simulation Software ◽  
Sidelobe Level ◽  
Lens Antenna ◽  
Lens Antennas ◽  
Simulation Results

Lens antennas with multibeam, high gain, and low sidelobe level are potential candidates for base station antennas in 5G mobile communication. In this paper, the authors perform simulation and parametric analysis of a lens antenna with positive and negative refractive indexes (NRI) using the modern electromagnetic field simulation software ANSYS HFSS. The simulation results of structures and theoretical calculations are analyzed and compared. The simulation results show the effectiveness of using negative refractive index lens antennas to minimize the dimension. The lens thickness with a negative refractive index decreased from 24.5 mm to 6.1 mm compared to the positive refractive index lens’s thickness. The results also indicate the similarities in gain, sidelobe level, amplitude, and electric field distribution on the aperture plane of the negative and positive refractive indexes (PRI) lens antennas compared to the theoretical calculation. In addition, the authors simulate a lens structure with additional quarter wavelength matching layers (MLs) to estimate the antireflection performance.

Dual-band tunable negative refractive index metamaterial with F-Shape structure

Open Physics ◽  
2014 ◽  
Vol 12 (8) ◽  
Author(s):  
Muhammad Rizwan ◽  
Hai-Bo Jin ◽  
Fida Rehman ◽  
Zhi-Ling Hou ◽  
Jing-Bo Li ◽  
...  
Keyword(s):  
Refractive Index ◽  
Negative Refractive Index ◽  
Broad Band ◽  
Dual Band ◽  
Electromagnetic Simulation ◽  
Negative Permeability ◽  
Effective Media ◽  
Shape Structure ◽  
Potential Applications ◽  
Tunable Metamaterial

AbstractThis paper presents a negative refractive index tunable metamaterial based on F-Shape structure which is capable of achieving dual-band negative permeability and permittivity, thus dual-band negative refractive index. An electromagnetic simulation was performed and effective media parameters were retrieved. Numerical investigations show clear existence of two frequency bands in which permeability and permittivity both are negative. The two negative refractive index bandwidths are from 23.8 GHz to 24.1 GHz and from 28.3 GHz to 34.9 GHz, respectively. The geometry of the structure is simple so it can easily be fabricated. The proposed structure can be used in multiband and broad band devices, as the band range in second negative refractive index region is 7 GHz, for potential applications instead of using complex geometric structures and easily tuned by varying the separation between the horizontal wires.

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