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PIER PIER B PIER C PIER M PIER Letters PIER Photonics
2024-01-08
Low Loss Anisotropic Circular Near-Zero Flexible Metasurface for Gain Enhancement
By
Arun Shaji B K,

    Dr. Arun Shaji B K

    School of Engineering

    Cochin University of Science and Technology

    India

    Homepage

Muhammed Hunize C V,

    Dr. Muhammed Hunize C V

    Department of Mechanical Engineering

    National Institute of Technology

    India

    Homepage

Anju Pradeep,

    Professor Anju Pradeep

    Division of Electronics Engineering

    Cochin University of Science and Technology

    India

    Homepage

Murali K P

    Prof. Murali K P

    Department of Mechanical Engineering

    National Institute of Technology

    India

    Homepage

Progress In Electromagnetics Research Letters, Vol. 116, 55-62, 2024
doi:10.2528/PIERL23110801 | Google Scholar

Abstract
This paper proposes a new low loss high dielectric substrate made of CaTiO3 incorporated butyl rubber (CBR). The synthesized material has a dielectric loss of 0.0048 and dielectric constant of 11.7. A novel circular anisotropic structure is used in the design of metamaterial unit cell. This metamaterial structure exhibits near-zero refractive index at 2.4 GHz. The extraction of refractive index is done from the scattering parameters using generalised sheet transition condition. An array of 3 × 3 unit cell is the metasurface superstrate, which is proposed for the gain enhancement. It is kept above the microstrip patch antenna working at 2.4 GHz. The proposed superstrate provides a gain enhancement of 4.6 dB. The height between the antenna and the superstrate is optimized to 0.088λ. The enhancement of gain on metasurface substrate with different loss tangents is analyzed. The simulation and measurement results of antenna with superstrate show good agreement with a peak gain of 7.6 dBi. The radiation efficiency of the antenna is increased by 42%.
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Citation
Arun Shaji B K, Muhammed Hunize C V, Anju Pradeep, and Murali K P, "Low Loss Anisotropic Circular Near-Zero Flexible Metasurface for Gain Enhancement," Progress In Electromagnetics Research Letters, Vol. 116, 55-62, 2024.
doi:10.2528/PIERL23110801
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