A new detection technique for identifying chipless RFID tags

Summary form only given. A chipless RFID system includes a reader, antenna and multiple tags presented in the main beam of the reader antenna. In addition, there are some background objects in the reader zone which makes the identifying process more challenging. Each tag has a unique ID, which is incorporated as a set of natural resonant frequencies. The presence or absence of these assigned resonances are considered as bit 1 and 0, respectively. In some practical applications, multiple tags may exist in the reader zone. In such cases, the detection and identification of the tags is challenging. Here, we introduce a new space-time-frequency identification technique by which we can distinguish the poles (complex natural resonances) of the tags successfully.