Metamaterial-Embedded Low SAR PIFA for Cellular Phone

Area of Science:

• Electromagnetics and Metamaterials
• Antenna Engineering
• Computational Electromagnetics

Background:

• Planar Inverted-F Antennas (PIFAs) are widely used in mobile devices.
• Concerns exist regarding specific absorption rate (SAR) in the human head from mobile phone antennas.
• Metamaterials offer novel electromagnetic properties for antenna design.

Purpose of the Study:

• To propose and investigate a metamaterial-embedded PIFA for dual-band operation (GSM 900 MHz and DCS 1800 MHz).
• To evaluate the impact of the metamaterial on SAR values in the human head.
• To assess the overall antenna performance with the metamaterial integration.

Main Methods:

• Design of a dual-band PIFA incorporating a planar one-dimensional metamaterial array on the ground plane.
• Electromagnetic simulation using the Finite Integration Technique (FIT) in CST Microwave Studio.
• Experimental validation of antenna performance and SAR measurements in an anechoic chamber using the COMOSAR system.

Main Results:

• The metamaterial-embedded PIFA achieved dual-band operation at GSM 900 MHz and DCS 1800 MHz.
• Significantly lower SAR values were observed for the proposed antenna compared to a conventional PIFA in both cheek and tilt head positions.
• Good agreement was found between simulated and measured antenna performance and SAR data.
• Slight improvements in antenna performance were noted due to the modified antenna substrate.

Conclusions:

• The metamaterial-embedded PIFA is a viable solution for reducing human head SAR in mobile phones.
• The proposed antenna design offers dual-band functionality with enhanced safety characteristics.
• Metamaterial integration presents a promising approach for developing safer and efficient mobile antennas.