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<p>This work constructed a two-port, compact wearable antenna using a flexible polyimide substrate. Circular polarization feature inside the working regime (3.1–3.45 THz) is achieved by perturbation of graphene built circular patch. High inter-port isolation (&gt; 25 dB) is achieved by arranging the two graphene radiating elements in a mirrored (anti-parallel) configuration, which introduces polarization diversity and effectively suppresses mutual coupling across the operating band. Underneath the radiator, a metasurface (MS) reflector reduces the Specific Absorption Rate (SAR) by over 85% for 1-g and 10-g tissue models respectively, while increasing the radiator gain to above 6.7 dBi. Programmable frequency tuning is achieved by electrostatically biasing the graphene radiator through a field-effect gating scheme, where a low DC voltage is applied between the graphene layer and the ground plane to control its chemical potential. Effective operation of the antenna over 3.03–3.91 THz is confirmed by full-wave simulations performed in HFSS and CST using a frequency-dependent surface-conductivity model for graphene. The antenna’s capacity to function steadily in bending circumstances further emphasizes its applicability for adaptable THz wireless communication systems.</p>

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Metasurface-assisted dual-port graphene built wearable THz antenna with circular polarization and reduced SAR

  • 期刊论文

  • 发表日期：

    2026年5月11日

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  • Utkarsh Sharma,
  • J. A. Ansari

摘要

This work constructed a two-port, compact wearable antenna using a flexible polyimide substrate. Circular polarization feature inside the working regime (3.1–3.45 THz) is achieved by perturbation of graphene built circular patch. High inter-port isolation (> 25 dB) is achieved by arranging the two graphene radiating elements in a mirrored (anti-parallel) configuration, which introduces polarization diversity and effectively suppresses mutual coupling across the operating band. Underneath the radiator, a metasurface (MS) reflector reduces the Specific Absorption Rate (SAR) by over 85% for 1-g and 10-g tissue models respectively, while increasing the radiator gain to above 6.7 dBi. Programmable frequency tuning is achieved by electrostatically biasing the graphene radiator through a field-effect gating scheme, where a low DC voltage is applied between the graphene layer and the ground plane to control its chemical potential. Effective operation of the antenna over 3.03–3.91 THz is confirmed by full-wave simulations performed in HFSS and CST using a frequency-dependent surface-conductivity model for graphene. The antenna’s capacity to function steadily in bending circumstances further emphasizes its applicability for adaptable THz wireless communication systems.