A novel method to improve the subcarrier frequency accuracy for UHF RFID sensing system

Kuanfeng Tang, Chao Zhang, Maodong Wang, Shengliang Xu, Shujiang Ji, Na Yan, Hao Min, Jin Mitsugi

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

This paper presents a novel method to improve the subcarrier frequency accuracy of tag chip for UHF RFID sensing system based on EPC global Gen2 protocol. By changing the tag's response to the Write command, the tag returns the subcarrier before returning the response specified in the protocol. In this way, a frequency calibration loop will be established between reader and tag. This method not only enables a low-power oscillator with a precise frequency to be integrated into a tag chip, but also enables flexible configuration of the frequency. The tag chip containing this idea is fabricated in SMIC 0.18 μm CMOS process with a die size of 850 μm × 850 μm. Measurement results show that the proposed novel method can realize the calibration of the subcarrier frequency, and the subcarrier frequency deviation is less than ±0.385KHz in the range of 40KHz-640KHz. With this accuracy, the tag can be allocated up to 78 subcarrier communication channels.

Original languageEnglish
Title of host publication2021 15th Annual IEEE International Conference on RFID, RFID 2021
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781665440905
DOIs
Publication statusPublished - 2021 Apr 27
Event15th Annual IEEE International Conference on RFID, RFID 2021 - Virtual, Atlanta, United States
Duration: 2021 Apr 272021 Apr 30

Publication series

Name2021 15th Annual IEEE International Conference on RFID, RFID 2021

Conference

Conference15th Annual IEEE International Conference on RFID, RFID 2021
Country/TerritoryUnited States
CityVirtual, Atlanta
Period21/4/2721/4/30

Keywords

  • frequency calibration
  • Gen2 protocol
  • subcarrier
  • tag chip
  • UHF RFID

ASJC Scopus subject areas

  • Artificial Intelligence
  • Computer Networks and Communications
  • Computer Science Applications
  • Signal Processing
  • Instrumentation

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