Utilization of Microwave Imaging for Chipless RFID Tag Reading and Verification - A Hybrid Approach

Area of Science:

• Electrical Engineering
• Electromagnetics
• Microwave Engineering

Background:

• Chipless RFID tags offer unique advantages but face limitations in data capacity and sensing capabilities.
• Existing spatial, time, and frequency domain approaches have inherent challenges.
• There is a need for more information-dense and versatile chipless RFID tag solutions.

Purpose of the Study:

• To propose and demonstrate a hybrid spatial- and frequency-domain approach for chipless RFID tags.
• To enhance the information density of chipless RFID tags for dual identification and sensing.
• To explore the utility of microwave synthetic aperture radar (SAR) imaging in conjunction with chipless RFID tags.

Main Methods:

• Integration of frequency-domain resonator information with microwave SAR imaging.
• Proof-of-concept investigation of the hybrid approach.
• Examination of SAR imaging for tag performance verification and material characterization.

Main Results:

• Demonstrated a hybrid approach combining frequency-domain data with SAR imaging for chipless RFID tags.
• Showcased the potential for dual identification and sensing functionalities.
• Identified image resolution as a key limitation for the hybrid approach.

Conclusions:

• The proposed hybrid spatial- and frequency-domain method offers a promising path towards more information-dense chipless RFID tags.
• SAR imaging can be a valuable tool for verifying tag performance, characterizing embedded materials, and understanding the tag environment.
• Further research is needed to overcome limitations related to SAR image resolution for practical applications.