ADAPTIVE COUPLER FOR REACTIVE NEAR FIELD RFID COMMUNICATION

摘要

The present invention relates to an adaptive near field electromagnetic coupler for coupling electromagnetic power to a plane metallic trace (inlay) independently of the inlay geometry and/or orientation without external control algorithms. This is achieved by employing a microstructure of phase altering elements suitable of creating a constant phase field distribution along a top surface of the coupler structure. The present invention is particular advantageously applicable to printing devices having a function of encoding RFID layers printed on a medium. In view of the provided flexibility, the coupler arrangement of the invention can be employed in a variety of printers of different mechanical design.