ENG and NZRI Characteristics of Decagonal-Shaped Metamaterial for Wearable Applications

Hossain, Kabir; Sabapathy, Thennarasan; Jusoh, M.; Soh, Ping Jack; Fazilah, Ainur Fasihah Mohd; Halim, Ahmad Ashraf Abdul; Raghava, N. S.; Podilchak, Symon K.; Schreurs, Dominique; Abbasi, Qammer H.

doi:10.1109/ucet51115.2020.9205409

Cited by 6 publications

(4 citation statements)

References 23 publications

(36 reference statements)

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“…This research also observed the impact of C-shaped SRRs on the design process to help alleviate issue with the fabrication complexity. Another fact that strongly supports the usage of an SRR type structure is that this has been found to improve the magnetic resonance of the material [38]. In the simulation setup boundary condition of the proposed C-shaped SRR MTM was followed according to Fig.…”

Section: Design and Methodology Of Tunable Mtm Unit Cellmentioning

confidence: 99%

Left-Handed Characteristics Tunable C-Shaped Varactor Loaded Textile Metamaterial for Microwave Applications

Al-Khatib¹,

Saif²

2022

Computers, Materials &Amp; Continua

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This paper presents a textile-based C-shaped split-ring resonators (SRR) metamaterial (MTM) unit cells with an electrical tunability function. The proposed MTM was composed of two symmetrical C-shaped SRR combined with a central diagonal metal bar, whereas the RF varactor diode is placed on the backside of the splitted ground plane. Stopband behavior of single and array MTM unit cells were analyzed while the achieved negative index physical characteristics were widely studies. Though four different MTM arrays (i.e., 1 × 1, 1 × 2, 2 × 1, and 2 × 2) were analyzed in simulation, a 2 × 2-unit cell array was chosen to fabricate, and it was further undergone experimental validation. This proposed tunable MTM exhibits double negative (DNG)/left-handed properties with an average bandwidth of more than 2.8 GHz. Furthermore, attainable negative permittivity and negative permeability are within 2.66 to 9.59 GHz and within 2.77 to 15 GHz, respectively, at the frequency of interest (between 1 and 15 GHz). Moreover, the proposed tunable MTM also showed tunable transmission coefficient characteristics. The proposed electrically tunable textile MTM might function in a dynamic mode, making it suitable for a variety of microwave-wearable applications. A satisfactory agreement between simulations and experiments were achieved, demonstrating that the proposed MTM can operate over a wide bandwidth.

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Section: Design and Methodology Of Tunable Mtm Unit Cellmentioning

confidence: 99%

Left-Handed Characteristics Tunable C-Shaped Varactor Loaded Textile Metamaterial for Microwave Applications

Al-Khatib¹,

Saif²

2022

Computers, Materials &Amp; Continua

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“…The RTR technique was then applied in simulations and experimental validations to retrieve the effective parameters ( ε and µ ) of the MTM unit cell. This was performed by extracting the scattering parameters from the structure when it is excited at normal incidence [ 33 , 34 ]. The RTR method was chosen instead of the Nicolson–Ross–Weir (NRW) method to avoid its known phase ambiguity [ 28 ].…”

Section: Methodsmentioning

confidence: 99%

Electrically Tunable Left-Handed Textile Metamaterial for Microwave Applications

et al. 2021

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An electrically tunable, textile-based metamaterial (MTM) is presented in this work. The proposed MTM unit cell consists of a decagonal-shaped split-ring resonator and a slotted ground plane integrated with RF varactor diodes. The characteristics of the proposed MTM were first studied independently using a single unit cell, prior to different array combinations consisting of 1 × 2, 2 × 1, and 2 × 2 unit cells. Experimental validation was conducted for the fabricated 2 × 2 unit cell array format. The proposed tunable MTM array exhibits tunable left-handed characteristics for both simulation and measurement from 2.71 to 5.51 GHz and provides a tunable transmission coefficient of the MTM. Besides the left-handed properties within the frequency of interest (from 1 to 15 GHz), the proposed MTM also exhibits negative permittivity and permeability from 8.54 to 10.82 GHz and from 10.6 to 13.78 GHz, respectively. The proposed tunable MTM could operate in a dynamic mode using a feedback system for different microwave wearable applications.

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“…It can be noted that in this extraction method, m = 0 was considered [ 36 ]. The values of ε and μ can be determined from the following expression [ 46 , 47 ]:

…”

Section: Flexible Polymer-based Textile Antenna Design With Metamaterialsmentioning

confidence: 99%

A Negative Index Nonagonal CSRR Metamaterial-Based Compact Flexible Planar Monopole Antenna for Ultrawideband Applications Using Viscose-Wool Felt

et al. 2021

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In this paper, a compact textile ultrawideband (UWB) planar monopole antenna loaded with a metamaterial unit cell array (MTMUCA) structure with epsilon-negative (ENG) and near-zero refractive index (NZRI) properties is proposed. The proposed MTMUCA was constructed based on a combination of a rectangular- and a nonagonal-shaped unit cell. The size of the antenna was 0.825 λ0 × 0.75 λ0 × 0.075 λ0, whereas each MTMUCA was sized at 0.312λ0 × 0.312λ0, with respect to a free space wavelength of 7.5 GHz. The antenna was fabricated using viscose-wool felt due to its strong metal–polymer adhesion. A naturally available polymer, wool, and a human-made polymer, viscose, that was derived from regenerated cellulose fiber were used in the manufacturing of the adopted viscose-wool felt. The MTMUCA exhibits the characteristics of ENG, with a bandwidth (BW) of 11.68 GHz and an NZRI BW of 8.5 GHz. The MTMUCA was incorporated on the planar monopole to behave as a shunt LC resonator, and its working principles were described using an equivalent circuit. The results indicate a 10 dB impedance fractional bandwidth of 142% (from 2.55 to 15 GHz) in simulations, and 138.84% (from 2.63 to 14.57 GHz) in measurements obtained by the textile UWB antenna. A peak realized gain of 4.84 dBi and 4.4 dBi was achieved in simulations and measurements, respectively. A satisfactory agreement between simulations and experiments was achieved, indicating the potential of the proposed negative index metamaterial-based antenna for microwave applications.

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ENG and NZRI Characteristics of Decagonal-Shaped Metamaterial for Wearable Applications

Cited by 6 publications

References 23 publications

Left-Handed Characteristics Tunable C-Shaped Varactor Loaded Textile Metamaterial for Microwave Applications

Left-Handed Characteristics Tunable C-Shaped Varactor Loaded Textile Metamaterial for Microwave Applications

Electrically Tunable Left-Handed Textile Metamaterial for Microwave Applications

A Negative Index Nonagonal CSRR Metamaterial-Based Compact Flexible Planar Monopole Antenna for Ultrawideband Applications Using Viscose-Wool Felt

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