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March 25, 2026Open Access

Low-SAR Multi-band Handset Antenna by Partially Reflective Surface

Key Points

The research aims to evaluate the effectiveness of a multi-band antenna with a partially reflective surface in reducing specific absorption rate.
Performance analysis of a multi-band antenna design with a partially reflective surface (PRS) below the substrate
Testing frequency bands from 850-977 MHz and 1.7-2.1 GHz
Utilization of a specific anthropomorphic mannequin (SAM) model for SAR measurement
The use of the PRS reduced the 1-g average SAR by 17-39% compared to the case without PRS
Antenna gain and radiation efficiency remained largely unaffected despite SAR reduction

Abstract

This paper describes the performance of a multi-band antenna with a partially reflective surface (PRS) printed below the substrate to reduce the level of specific absorption rate(SAR). The frequency band considered ranges lower (850-977 MHz) and higher (1.7-2.1 GHz) bands. The multi-band antenna placed above an FR4 substrate with the PRS printed below was found to reduce the 1-g average SAR in a specific anthropomorphic mannequin(SAM) model by 17-39 % as compared to the average SAR level of the no-PRS case, without much sacrificing antenna gain and radiation efficiency.

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