A novel dipole antenna backed by a thin and small-area AMC for good impedance match and low SAR on human tissue

Abstract

This paper presents a new dipole antenna that has robust input impedance matching and electromagnetic radiation, and low SAR for human body contact. It is made possible by backing the main radiator with a thin and small-area artificial magnetic conductor (AMC). Different from the conventional AMC which occupies a multi-layered large area based on the full PEC ground for a high antenna directivity, the proposed structure works for 2.4-GHz-ISM band, and has a 1-mm thickness and a 50 mm-by-50 mm footprint with good impedance matching and radiation performances even near human tissue, and a low SAR below 1.6 W/kg is obtained. This design method is validated by full-wave simulations and physical implementation.