Mobile phone MIMO antenna array miniaturization-based low SAR research in the combined EMF

Area of Science:

• Electromagnetics
• Human Exposure Studies
• Mobile Communications Technology

Background:

• Mobile phone media functions have increased usage time, leading to higher electromagnetic field (EMF) exposure.
• Conventional EMF safety studies often overlook combined frequency impacts, necessitating further quantification of public exposure.
• Simultaneous 4G and 5G operation presents a unique EMF exposure scenario.

Purpose of the Study:

• To quantify EMF exposure dose from simultaneous 4G/5G mobile phone use.
• To evaluate the impact of combined EMF on users.
• To investigate the effectiveness of miniaturized mobile phone multiple-input multiple-output (MIMO) antenna arrays in reducing specific absorption rate (SAR).

Main Methods:

• Utilized a miniaturized mobile phone MIMO antenna array as the radiation source.
• Established multi-pose human models to simulate practical smartphone usage.
• Conducted systematic SAR analysis under single and combined EMF scenarios.

Main Results:

• Multi-frequency exposure resulted in peak SAR values 1.02 to 15.85 times higher than single-frequency exposure across various tissues.
• Demonstrated that miniaturized MIMO antenna arrays can significantly reduce absorbed SAR.
• Quantified the increased SAR under combined 4G and 5G radiation.

Conclusions:

• Combined 4G/5G EMF exposure significantly elevates user SAR compared to single frequencies.
• Miniaturized MIMO antenna arrays show promise in mitigating SAR.
• Further research is needed to ensure public safety with evolving mobile communication technologies.