Introduction of electromagnetic image-based chipless RFID system

All available techniques in chipless RFID systems are suffering from low data capacity. In this paper electromagnetic imaging technique in mm-wave range is proposed to enhance low data capacity of chipless RFID tags. It is shown through simulation that the diffraction of electromagnetic waves by a well oriented narrow conductive strip suggests a reliable approach for data encoding in the proposed technique. The proposed technique is capable of coding 2 bit/cm² in only 100 MHz of frequency bandwidth. Synthetic Aperture Radar technique is also proposed to provide a high resolution image and solving the problem of farfield limitation of the reader antenna.