scholarly journals Modified double dumbbell-shaped split-ring resonator-based negative permittivity metamaterial for satellite communications with high effective medium ratio

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Md Bellal Hossain ◽  
Mohammad Rashed Iqbal Faruque ◽  
Sikder Sunbeam Islam ◽  
Mohammad Tariqul Islam
Keyword(s):  
Numerical Simulation ◽  
High Frequency ◽  
Satellite Communication ◽  
Ring Resonator ◽  
Satellite Communications ◽  
Split Ring Resonator ◽  
Effective Medium ◽  
Unit Cell ◽  
Negative Permittivity ◽  
Split Ring

AbstractMetamaterial with negative permittivity demonstrate excellent performance in cutting-edge technology. Thus, this study modified the double dumbbell-shaped split-ring resonator (MDD-SRR) based negative permittivity for satellite communications. The proposed MDD-SRR unit cell comprises a square-shaped split-ring resonator and two dumbbell-shaped rings. Some parts of the outer square ring were extended to enlarge the electrical length which altered the inductance of the metamaterial unit cell. The dimension of the proposed unit cell is 9 × 9 × 1.524 mm3, fabricated on a Rogers RT6002 (lossy) substrate material. Based on the results, five resonances for the transmission coefficient were achieved at frequencies of 2.896 GHz, 8.11 GHz, 9.76 GHz, 12.48 GHz and 13.49 GHz, including the S, X and Ku band satellite communication frequency bands through numerical simulation in a high-frequency electromagnetic simulator Computer Simulation Technology (CST) microwave studio. Negative permittivity at frequencies ranging from 2.896–3.76 GHz, 8.11–8.592 GHz, 9.76–10.784 GHz, 12.496–12.768 GHz, 13.504–14.4 GHz, were observed and extracted using the Robust and Nicolson–Ross–Weir (NRW) methods. Meanwhile, an effective medium ratio (EMR) measured at 11.51 to 2.896 GHz specified the goodness of the metamaterial unit cell for satellite communication with higher bandwidth and gain. The simulated, circuit model and measured results that were compared for validation purposes indicated that the simulation results, the equivalent circuit model results and measured results occupied each other. Moreover, the numerical simulation of the double dumbbell-shaped metamaterial unit cell was performed using a High-Frequency Structure Simulator (HFSS) to confirm the results. To evaluate the parametric study, the proposed unit cell was subjected to change different substrate types, change of split gap of rings, change of direction of electromagnetic field propagation, and structural optimization. In conclusion, the S, X and Ku-bands in the proposed metamaterial are competent for satellite communications as they are also investigated using an array of a unit cell.

scholarly journals Modified Hexagonal Split Ring Resonator Based on an Epsilon-Negative Metamaterial for Triple-Band Satellite Communication

Micromachines ◽  
2021 ◽  
Vol 12 (8) ◽  
pp. 878
Author(s):  
Salah Uddin Afsar ◽  
Mohammad Rashed Iqbal Faruque ◽  
Mohammad Jakir Hossain ◽  
Mayeen Uddin Khandaker ◽  
Hamid Osman ◽  
...  
Keyword(s):  
Satellite Communication ◽  
Ring Resonator ◽  
Negative Refractive Index ◽  
Split Ring Resonator ◽  
Metal Strip ◽  
Unit Cell ◽  
Negative Permittivity ◽  
Long Distance ◽  
Split Ring ◽  
Triple Band

A triple-band epsilon-negative (ENG) metamaterial based on a split ring resonator (SSR) with a modified hexagonal-shaped metal strip proposed in this study is a new combination of a single slit square resonator and a modified hexagonal-shaped metal strip. The desired unit cell FR-4 (lossy) that was selected as the substrate was 1.6 mm thick. Following the assessment of the unit cell, a high-frequency electromagnetic simulator like the computer simulation technology (CST) microwave studio was applied to assess the S-parameters. The proposed design exhibited resonance at 2.89, 9.42, and 15.16 GHz. The unit cell also demonstrated negative permittivity in the frequency ranges 2.912–3.728 GHz, 9.552–10.144 GHz, and 15.216–17.328 GHz, along with a negative refractive index. An effective medium ratio (EMR) of 11.53 is an indicator of the goodness of the metamaterial unit cell. It is deliberate at the lowermost resonance frequency of 2.89 GHz. Moreover, the simulated results that were validated using HFSS and equivalent circuit model indicated slight variations. The proposed design was finalised based on several parametric studies, including design optimisation, different unit cell sizes, various substrate materials, and different electromagnetic (EM) field propagations. The proposed triple band (S, X, and Ku bands) negative permittivity metamaterial unit cell can be utilised for various wireless applications, such as microwave communication, satellite communication, and long-distance radio communication.

scholarly journals Isolation Improvement Technique for Two Closely Spaced Loop Antennas Using MTM Absorber Cells

2012 ◽  
Vol 2012 ◽  
pp. 1-9 ◽  
Author(s):  
Hongmin Lee ◽  
Hyungsup Lee
Keyword(s):  
Ring Resonator ◽  
Split Ring Resonator ◽  
Unit Cell ◽  
New Method ◽  
Negative Permittivity ◽  
Split Ring ◽  
Antenna Structure ◽  
Complementary Split Ring Resonator ◽  
Permittivity And Permeability ◽  
Loop Antennas

This paper presents a new method to improve isolation between two loop antennas with absorber cells exhibiting negative permittivity and permeability at the aimed frequency of 2.54 GHz. The metamaterial (MTM) unit cell was constructed by two open complementary split ring resonator (OCSRR) and a split ring resonator (SRR) arrangement. The proposed antenna structure consists of two loop antennas occupying a space with the dimensions of51 mm×24 mm×2 mmand three absorber cells. The size of each absorber unit cell is7.4 mm×7 mm×2 mm. The isolation of more than 20 dB was achieved with three absorber cells loaded between two loop antennas; interantenna spacing (center to center) is 0.23λ0at 2.54 GHz. The results show that port-to-port isolation between two antennas can be improved with absorber.

scholarly journals A multi-split based square split ring resonator for multiband satellite applications with high effective medium ratio

2021 ◽  
Vol 22 ◽  
pp. 103865
Author(s):  
Air Mohammad Siddiky ◽  
Mohammad Rashed Iqbal Faruque ◽  
Mohammad Tariqul Islam ◽  
Sabirin Abdullah
Keyword(s):  
Ring Resonator ◽  
Split Ring Resonator ◽  
Effective Medium ◽  
Split Ring ◽  
Satellite Applications

scholarly journals Coupled ring split ring resonator (CR-SRR) based epsilon negative metamaterial for multiband wireless communications with high effective medium ratio

2020 ◽  
Vol 18 ◽  
pp. 103248
Author(s):  
Md. Moniruzzaman ◽  
Mohammad Tariqul Islam ◽  
Md. Rashedul Islam ◽  
Norbahiah Misran ◽  
Md Samsuzzaman
Keyword(s):  
Wireless Communications ◽  
Ring Resonator ◽  
Split Ring Resonator ◽  
Effective Medium ◽  
Split Ring

A Design Procedure for Electric Inductive Capacitive Resonators with Negative Permittivity

2013 ◽  
Vol 448-453 ◽  
pp. 2199-2202
Author(s):  
Shi Wei Zhou ◽  
Yi Min Xie ◽  
Qing Li ◽  
Xiao Dong Huang
Keyword(s):  
Ring Resonator ◽  
Design Procedure ◽  
Computational Design ◽  
Split Ring Resonator ◽  
Index Of Refraction ◽  
Negative Permittivity ◽  
Electromagnetic Properties ◽  
Optimization Approach ◽  
Split Ring ◽  
Negative Index Of Refraction

Permittivity signifies a key component to metamaterial which can achieve negative index of refraction, but it has not been sufficiently addressed in computational design. This paper aims to attain negative permittivity through a topology optimization approach and provides an example equivalent to electric inductive-capacitive resonator. Similar to split ring resonator, this locally self-contained (without the demand for inter-cell connection) resonator allows keeping bulk electromagnetic properties homogeneously, facilitating mass fabrication, and realizing single sampling test.

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