Low-cost UHF near-field power transmission for RFID applications

International audienceThis paper presents a low-cost contactless power transfer structure for planar configuration working at UHF frequencies. The theory of defected ground structure (DGS) is applied to unconventional materials for power transmission between two closely spaced microstrip lines. Such configuration is studied and described in details, for an easy implementation employing very low-cost materials, characteristics of deemed importance in radio frequency identification (RFID) applications. Influence of nearby material is analyzed and theoretical results are experimentally validated. A possible application for RFID readers is finally proposed. Keywords-wireless power transfer (WPT); near-field; RFID; ultra-high frequency (UHF) communication, defected ground structure (DGS)