Frequency Coded High Density Complementary U – shaped Chipless RFID Tag Design

Chipless Radio Frequency Identification (RFID) technology is one of the emerging tracking and identification technologies that is going to replace existing conventional technologies like barcodes in the near future. RFID is also used in communications and monitoring purposes in biomedical applications. Chipless RFID technology has a cutting edge over optical barcodes as it does not require a Line of Sight (LOS) for communication. This paper presents a compact Chipless RFID design with a high bit capacity of 10 bits. The design is based on Complementary U-shaped resonators and can be coded with Frequency Domain Approach (FDA) technique. The proposed design can be used for Ultra-Wide Band (UWB) applications. The design has a physical footprint of 40 mm $\times25$ mm $\times1.6$ mm and is designed on FR-4 epoxy substrate and operates in the frequency range of 1 GHz to 11 GHz with 10 resonant peaks. The simulation of the tag structure is carried out in a 3D electromagnetic simulator.