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Long-Range UHF RFID Tag for Automotive License Plate
Youchung Chung1, Teklebrhan H Berhe1
1Information and Communication Engineering Department, Daegu University, Kyungsan 38453, Korea.
Sensors (Basel, Switzerland)
|April 30, 2021
Summary
This study optimized Ultra High Frequency (UHF) Radio Frequency Identification (RFID) tag placement on license plates. The designed UHF RFID tag utilizes a back-lobe pattern for enhanced durability and a reading range of over 10 meters.
Area of Science:
- Electrical Engineering
- Electromagnetics
- Automotive Technology
Background:
- Traditional Radio Frequency Identification (RFID) tags face challenges with environmental exposure and optimal placement on vehicles.
- Automotive license plates present a unique mounting location with specific electromagnetic considerations.
Purpose of the Study:
- To investigate the optimal placement and design of a UHF RFID tag for automotive license plates.
- To enhance tag durability and reading range by leveraging the tag's radiation pattern.
Main Methods:
- Electromagnetic simulation using CST software to design a passive loop antenna UHF RFID tag.
- Analysis of tag antenna radiation patterns, specifically focusing on the back-lobe radiation.
- Experimental measurement of the tag's reflection coefficient, gain, and reading range in an open field.
Main Results:
- A UHF RFID tag with a 130 × 50 mm passive loop antenna was designed and simulated.
- The tag exhibited a reflection coefficient of -21 dB at 920 MHz and a back-lobe gain of 6.29 dBi.
- Achieved reading ranges of 10.3 m with a license plate holder and 9.4 m when mounted on the vehicle bumper.
Conclusions:
- The designed UHF RFID tag is suitable for automotive applications due to its small size and effective use of the back-lobe radiation pattern.
- The back-lobe radiation design inherently protects the tag from environmental factors like dust and insects, eliminating the need for additional protective casings.
