Compact slot-based chipless RFID tag

Abstract

We present a fully printable, planar, orientation independent, single layer, chipless RFID tag. The tag consists of a circular patch with multiple discretized circular slot resonators nested in it. This design reduces the total size of the tag since the discrete circular slot resonators resonate at a lower frequency than perfect circular resonators for the same diameter. Reader's complexity is reduced as the tag is polarization independent, improving the tags readability from different angles with respect to the reader antenna. Its single layer characteristics make this tag a potential candidate for conductive ink printing. The frequency band is within 6 to 14 GHz.