SAR mitigation of textile antenna via an artificial magnetic conductor (AMC) plane

An artificial magnetic conductor (AMC) plane is a type of two-dimensional metamaterial, which are widely used in the design of planar antennas. Its current corresponds to an in-phase image and its ability in suppressing parallel plate modes is also favorable in forming a reflecting structure near a magnetic dipole. This is beneficial in mitigating electromagnetic coupling in textile antennas when operating on-body, besides ensuring a conformant Specific Absorption Rate (SAR). However, the need for these textile antennas to operate across a wide/multiple frequency bands calls for the design of AMC planes with similar resonant characteristics, which can either be realized by exciting the higher modes of the structure, or by integrating different shapes of AMC unit cells. Yet, the implementation of more complicated AMC shapes are limited due to the use of the textile materials and its fabrication technology.