Design and Implementation of a Flexible Chipless RFID Coding Tag Based on Eyeball Structure.

Area of Science:

• Biomimetics and Materials Science
• Electrical Engineering and Applied Physics

Background:

• Traditional Radio Frequency Identification (RFID) tags often lack flexibility and struggle with limited coding capacity.
• The need for compact, high-capacity, and flexible identification solutions is growing across various industries.

Purpose of the Study:

• To develop a novel flexible, chipless RFID tag inspired by the human eyeball's structure.
• To achieve controllable resonant frequency shifts and high coding capacity within a compact design.
• To evaluate the tag's performance under mechanical stress relevant to flexible applications.

Main Methods:

• A bionic circular resonant structure was designed and fabricated on a polyimide substrate.
• Selective addition/removal of branch structures enabled controllable resonant frequency shifts.
• The tag's coding capacity and performance were analyzed through simulations and experiments.

Main Results:

• The flexible chipless RFID tag achieved a coding capacity exceeding 45 bits.
• Operated effectively within a 4-12 GHz frequency bandwidth, demonstrating synergistic improvement in coding capacity and compactness.
• Simulation and experimental results confirmed encoding stability under bending and rotational conditions.

Conclusions:

• The proposed bionic circular resonant structure is feasible for developing advanced flexible chipless RFID tags.
• The design offers a promising solution for high-capacity, compact, and robust identification systems.
• This work contributes to the advancement of flexible electronics and wireless identification technologies.