Chipless RFID tag based on space angle information

This paper presents a novel chipless radio frequency identification (RFID) tag that encodes data based on space angle information. The radiating unit of the proposed tag has the obvious character of the space angle. Compared with that based on the time domain reflectometry and spectral signature, the chipless tags based on space angle information can obtain the larger encoding capacity. Also, the proposed tag is identified by the complex scattered field in two orthogonal polarization directions.