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<p>This paper presents a comprehensive analysis of a designed flexible patch antenna operating at the 5.8&#xa0;GHz frequency band. The antenna is designed using a flexible PTFE (Polytetrafluoroethylene) polymer with a permittivity (εr) of 2.1 and a tanδ of 0.0002, featuring an optimal substrate thickness (d) of 1.2&#xa0;mm. The results obtained indicate that, at this specified thickness, the antenna exhibits superior performance characteristics, showcasing an omnidirectional pattern in the H-plane and a quasi-omnidirectional pattern in the E-plane. The antenna achieves a notable gain value of 4.72 dBi at 5.8&#xa0;GHz, accompanied by an efficiency of 73%. Moreover, the on-body performance analysis reveals that the proposed antenna maintains a stable gain even under the influence of bending effects. The Specific Absorption Rate (SAR) value at the resonant frequency reaches maximum values of 0.027 W/Kg, aligning with FCC standards. This establishes the proposed antenna as a better choice for a variety of emerging applications operating within the sub-6&#xa0;GHz band and highly suitable for medical applications, where minimizing radiation exposure to human tissues is critical. This ensures safe and efficient performance in biomedical devices, such as wearable health monitors and wireless medical implants.</p>

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High Effective Flexible Microstrip Antenna with PTFE (Polytetrafluoroethylene) Substrate for SAR Applications Under Sub-6 GHz Band

  • 期刊论文

  • 发表日期：

    2025年6月13日

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  • Djamila Ziani,
  • Allel Mokaddem,
  • Mohammed Belkheir,
  • Mehdi Rouissat,
  • Merahi Bouziani,
  • Pascal Lorenz

摘要

This paper presents a comprehensive analysis of a designed flexible patch antenna operating at the 5.8 GHz frequency band. The antenna is designed using a flexible PTFE (Polytetrafluoroethylene) polymer with a permittivity (εr) of 2.1 and a tanδ of 0.0002, featuring an optimal substrate thickness (d) of 1.2 mm. The results obtained indicate that, at this specified thickness, the antenna exhibits superior performance characteristics, showcasing an omnidirectional pattern in the H-plane and a quasi-omnidirectional pattern in the E-plane. The antenna achieves a notable gain value of 4.72 dBi at 5.8 GHz, accompanied by an efficiency of 73%. Moreover, the on-body performance analysis reveals that the proposed antenna maintains a stable gain even under the influence of bending effects. The Specific Absorption Rate (SAR) value at the resonant frequency reaches maximum values of 0.027 W/Kg, aligning with FCC standards. This establishes the proposed antenna as a better choice for a variety of emerging applications operating within the sub-6 GHz band and highly suitable for medical applications, where minimizing radiation exposure to human tissues is critical. This ensures safe and efficient performance in biomedical devices, such as wearable health monitors and wireless medical implants.