A UHF near-field RFID system with contactless inductively coupled antenna

This paper presents a smart UHF near-field RFID system with contactless inductively coupled antenna. A fully integrated inductively coupled antenna is designed to solve the problem of short read distance of the On-chip Antenna (OCA) tag. The inductively coupled antenna used a novel cross structure to achieve resonant effect which also diminishes the size of the antenna. No physical connection between the antenna and the tag chip greatly reduces the cost of assembling and testing. The size of the inductively coupled antenna is only 1 × 1.1cm
²
small. Test proved that the tag chip with this contactless antenna is responded properly at 2cm away from the reader antenna of 20dBm.