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A High-Gain Passive UHF-RFID Tag with Increased Read Range.

Simone Zuffanelli1, Pau Aguila2, Gerard Zamora3

  • 1Departament d'Enginyeria Electrònica, Universitat Autònoma de Barcelona (UAB), Campus UAB, Bellaterra, Barcelona 08193, Spain. simone.zuffanelli@uab.cat.

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Summary

Researchers developed a novel passive ultra-high frequency radio-frequency identification (UHF-RFID) tag with a 1.25 wavelength dipole antenna. This innovative design significantly enhances the read range of UHF-RFID systems.

Keywords:
dipole antennasimpedance matchingradio-frequency identification (RFID)

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Area of Science:

  • Electrical Engineering
  • Electromagnetics
  • Wireless Communication

Background:

  • Passive ultra-high frequency radio-frequency identification (UHF-RFID) tags are crucial for inventory management and tracking.
  • Existing passive UHF-RFID tags often face limitations in read range and antenna efficiency.
  • Optimizing antenna design is key to improving the performance of passive RFID systems.

Purpose of the Study:

  • To present a novel passive UHF-RFID tag design utilizing a 1.25 wavelength thin dipole antenna.
  • To maximize the tag's read range while maintaining practical dimensions and a stable radiation pattern.
  • To demonstrate a simple impedance matching technique for efficient RFID chip integration.

Main Methods:

  • Design and simulation of a 1.25 wavelength dipole antenna tailored for UHF-RFID applications.
  • Development of a simple shunt inductance matching network to connect the antenna to the RFID chip.
  • Fabrication of a prototype tag using the Alien Higgs-3 chip and experimental validation of its performance.

Main Results:

  • The fabricated passive UHF-RFID tag achieved a maximum measured read range of 17.5 meters in the 902-928 MHz frequency band.
  • The antenna's length was optimized to balance read range, tag size, and radiation characteristics.
  • The tag's overall dimensions are 400 mm × 14.6 mm, with a narrow width of 0.8 mm.

Conclusions:

  • The proposed 1.25 wavelength dipole antenna design offers a significant improvement in read range for passive UHF-RFID tags.
  • The simple matching network ensures efficient power transfer from the antenna to the RFID chip.
  • This advancement holds potential for broader applications requiring long-range, low-cost RFID solutions.