Comparative Study of Chipless RFID Tag Resonator for Orientation-Independent Properties and Bit-Capacity

Radio frequency identification (RFID) is a growing technology in various domains for identification and tracking purposes. Wearable and on-body sensing technology are significant topics in the industrial, scientific, and medical fields. Based on the presence of the IC chip, RFID tags can be classified into chipped and chipless tags. Recently, chipless RFID tags are being investigated because of their high usage and low cost. Orientation-independent chipless RFID tags are promising for future wearable sensing devices. Therefore, an understanding of the orientation-independent Chipless RFID tags is necessary to develop the sensor tags. The paper’s main purpose is to explore the flexibility of the chipless RFID tag for rotation insensitivity and coding capacity. Here, conventional shapes of resonators like square, circle, triangle and hexagon in microstrip patch configuration are studied for the orientation-independent property. Further, concentric circular ring and slot configurations are discussed for high bit-capacity.