Chipless millimeter wave identification (MMID) tag at 30 GHz

A fully printable, passive and planar chipless millimeter wave identification (MMID) tag at 30 GHz is presented. The chipless tag encodes data into the spectral signature using a multiresonator. Both amplitude and phase components of the spectral signature are used for data encoding. The chipless MMID tag is a prototype and comprises of a microstrip multiresonating circuit with 6 spiral resonators and two cross-polarized transmitting and receiving circular UWB monopole antennas. The chipless MMID tag has the potential of encoding a larger number of data bits (>;20) with the extension of the operating frequency band it uses. The chipless tag is designed for low cost item tagging and security applications for items such as banknotes and secure documents.