Chipless UWB-RFID tag with spectral and temporal joint signatures

A chipless UWB-RFID tag is proposed in the paper that, depending on the geometric topology, renders signature in the spectrum of structural mode, and signature in the time domain of antenna mode. The tag is configured by a planar patch antenna, on which a U slot with a resistive load located in the middle site is etched to issue a band-gap in the spectrum of the structural mode. In addition, a microstrip line is connected, the end of which is equipped with a resistive load that, along with the length of the feed line, determine the status quo of the antenna mode in time domain. A threshold application is simulated by setting the resistive load in three states: the open, the short and the impedance matching. Results show this tag can be portrayed by joint spectral and temporal signatures that are distinct enough to fulfill identification in contactless way; Moreover the joint spectral and temporal signature can be extended to interrogate more complicated circumstances or the cases that are required by increased information capacity.