Now showing 1 - 3 of 3
  • Publication
    ENG and NZRI Characteristics of Decagonal-Shaped Metamaterial for Wearable Applications
    ( 2020-08-01)
    Hossain K.
    ;
    ; ;
    Soh Ping Jack
    ;
    Fazilah A.F.M.
    ;
    Halim A.A.A.
    ;
    Raghava N.S.
    ;
    Podilchak S.K.
    ;
    Schreurs D.
    ;
    Abbasi Q.H.
    A decagonal-shaped split ring resonator metamaterial based on a wearable or textile-based material is presented in this work. Analysis and comparison of various structure sizes are compared considering a compact 6\times 6\ \mathrm{m}\mathrm{m}{2} metamaterial unit cell, in particular, where robust transmission-reflection (RTR) and Nicolson-Ross-Weir (NRW) methods have been performed to extract the effective metamaterial parameters. An investigation based on the RTR method indicated an average bandwidth of 1.39 GHz with a near-zero refractive index (NZRI) and a 2.35 GHz bandwidth when considering epsilon negative (ENG) characteristics. On the other hand, for the NRW method, approximately 0.95 GHz of NZRI bandwidth and 2.46 GHz of ENG bandwidth have been observed, respectively. These results are also within the ultra-wideband (UWB) frequency range, suggesting that the proposed unit cell structure is suitable for textile UWB antennas, biomedical sensors, related wearable systems, and other wireless body area network communication systems.
  • Publication
    A Compact Wideband CSRR near Zero Refractive Index and Epsilon Negative Metamaterial for Wearable Microwave Applications
    ( 2021-07-26)
    Hossain K.
    ;
    ; ;
    Soh Ping Jack
    ;
    Osman M.N.
    ;
    Al-Bawri S.S.
    A complementary split-ring resonator (CSRR) decagonal shaped textile-based single-negative metamaterial (MTM), considering a frequency range from 1 to 15 GHz, is presented in this paper. Seven different unit cell arrays (i.e., 1 1, 1 2, 1 3, 2 1, 2 2, 1 3 and 3 3) are analysed to evaluate the effects of the unit-cell arrays on the resonance frequencies of the MTM. The designed unit cell arrays exhibit average negative permittivity bandwidth of 12.87 GHz (from 1 to 12.87 GHz) and an average near-zero-refractive-index (NZRI) bandwidth of 11.98 GHz (from 1.015 to 12.995 GHz). Simultaneous negative permittivity and NZRI results at L, S, C, X and Ku frequency bands indicate the proposed MTM is suitable for various wearable applications in these frequency regimes.
      1  11
  • Publication
    A Flexible and Compact Metamaterial UHF RID Tag for Remote Sensing in Human Health
    ( 2020-08-01)
    Ainur Fasihah Mohd Fazilah
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    ; ;
    Abbasi, Qammer Hussain
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    Kabir Hossain
    ;
    ; ; ;
    Muhammad Ramlee Kamarudin
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    Majid, Huda Ahmad
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    Soh Ping Jack
    This paper presents a miniaturized UHF RFID tag antenna with increased gain using meander line techniques and metamaterial (MTM). The designed tag operates in the UHF RFID frequency band ranging from 860 to 960 MHz. It comprises of meandered lines with two hexagonal split ring resonators (H-SRRs) MTM cells. It is designed on a photo paper as its substrate which is 0.27 mm thick, with a dielectric constant of 3.2 and loss tangent of 0.05. Next, an RFID tag (NXP SL381213 UCODE G2iL chip) with an impedance of 23-j224 \Omega is integrated with the proposed antenna to assess its performance in terms of reflection coefficient, antenna gain and maximum reading range. The overall size of the tag is 92 mm x26 mm.
      6  2