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Specific absorption rate reduction for sub-6 frequency range using polarization dependent metamaterial with high

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A novel multi-layered square-shaped metamaterial (MSM) structure effectively reduces electromagnetic absorption in mobile devices. This compact metamaterial design significantly lowers Specific Absorption Rate (SAR) values, enhancing safety for wireless communication technologies.

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Area of Science:

  • Electromagnetics and Materials Science
  • Metamaterial applications in wireless communication

Background:

  • Wireless mobile devices emit radiofrequency (RF) energy, necessitating research into reducing electromagnetic (EM) absorption.
  • Advancements in wireless technologies, including cellular data networks, highlight the need for effective EM absorption reduction strategies.

Purpose of the Study:

  • To introduce a compact, multi-layered square-shaped metamaterial (MSM) structure for reducing EM absorption in wireless mobile devices.
  • To design a metamaterial for attachment within mobile phones, targeting the Sub-6 frequency range without overlapping existing components.
  • To achieve significant reduction in Specific Absorption Rate (SAR) values.

Main Methods:

  • Six distinct square-shaped metamaterials were fabricated on a 0.25 mm Rogers RO3006 substrate.
  • Numerical simulations were conducted using Computer Simulation Technology (CST) Microwave Studio 2019 to analyze EM properties and SAR reduction.
  • Simulations were cross-validated using High-Frequency Structure Simulator (HFSS) to authenticate the results.

Main Results:

  • The proposed MSM structure demonstrated multi-band resonance frequencies across L, S, and C bands (e.g., 1.200 GHz to 5.872 GHz).
  • The metamaterial exhibited left-handed behavior at all resonance frequencies.
  • The highest recorded SAR values were 98.136% (1g tissue) and 98.283% (10g tissue) at 1.560 GHz, indicating substantial absorption reduction.

Conclusions:

  • The developed MSM structure successfully meets the research objectives for EM absorption reduction.
  • The compact and efficient design makes the MSM suitable for integration into wireless mobile devices.
  • This metamaterial offers a viable solution for enhancing the safety of modern wireless communication technologies.