Articles written in Pramana – Journal of Physics

    • Tunable six-band miniaturised metamaterial absorber for IoT and THz imaging applications


      More Details Abstract Fulltext PDF

      A novel metamaterial absorber with multiband characteristics is proposed to solve the limited bandwidth problem of the internet of things (IoT) backhaul network. The designed tunable absorber has six L-shaped stubs with graphene at the edges to realise six absorption bands of 0.5, 0.78, 1, 1.2, 1.55 and 1.9 THz. The absorption bands are individually tunable by varying the Fermi level of graphene by controlling the electrostatic gating. Hence,tunable absorption characteristics are provided in the optical regime. The absorber is made of polyimide substrate having a unit cell of 0.13λ$_0$ × 0.13λ$_0$ dimension, which is smaller than similar kinds of substrates described in the literature. The simulation result shows a better absorption coefficient value of 0.9 over most of the operating bands. The influence of material on the absorption peak is analysed by using different types of conductor and dielectric materials. The designed absorber is a perfect candidate to overcome bandwidth issues in IoT backhaul networks and is also suitable for emerging terahertz applications.

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