On The Effect of Mutual Coupling on LF and UHF Tags Implemented in Dual Frequency RFID Applications - PowerPoint PPT Presentation

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On The Effect of Mutual Coupling on LF and UHF Tags Implemented in Dual Frequency RFID Applications

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Title: A Printed Rampart-Line Antenna with a Dielectric Superstrate for UHF RFID Applications Author: Ben Braaten Last modified by: Benjamin.Braaten – PowerPoint PPT presentation

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Title: On The Effect of Mutual Coupling on LF and UHF Tags Implemented in Dual Frequency RFID Applications


1
On The Effect of Mutual Coupling on LF and UHF
Tags Implemented in Dual Frequency RFID
Applications
  • Gregory J. Owen
  • Benjamin D. Braaten
  • Robert M. Nelson
  • Dustin Vaselaar

Cherish Bauer-Reich Jacob Glower Michael
Reich Aaron Reinholz
North Dakota State University
2
Topics
  • Introduction
  • Dual frequency tag
  • Test setup
  • Test results
  • Discussion
  • Conclusion

North Dakota State University
3
Introduction
  • Interest in RFID has recently grown tremendously
    in many areas 1-5
  • supply chain management 6-8
  • RFID security 9-10
  • UHF antenna design 11
  • back-scattering analysis 12-14
  • dual frequency applications
  • Types of systems 1
  • passive
  • semi-passive
  • active

North Dakota State University
4
Introduction
  • On a passive tag the antenna is typically
    connected directly to the rectifier.
  • thus antenna impedance and rectifier impedance
    directly effect the read range
  • Antenna characteristics (gain, input impedance
    and resonant frequency) can be effected by nearby
    conducting and non-conducting objects 15-21
  • Weather-proof enclosures
  • Surface placement of tag
  • Other RFID tags (i.e., dual-frequency tags)

North Dakota State University
5
Introduction
  • Several advantages are gained by using a
    weather-proof enclosure 18
  • Protection against heat, physical damage, and the
    environment (moisture, sun)
  • Dual-frequency implementation
  • Several examples include
  • Electronic car tolling 22
  • Livestock tracking 23-24

North Dakota State University
6
A Little Background
  • The max theoretical read range of a passive RFID
    tag can be written as (using Friiss eqn.) 25
  • where

North Dakota State University
7
The Dual-Frequency Tag and Test Setup
(902-928MHz)
(125.4-134kHz)
North Dakota State University
8
Test Setup
North Dakota State University
9
Test Results
(reminder)
LF tag
North Dakota State University
10
Test Results
(reminder)
M-tag 33
North Dakota State University
11
Test Results
(reminder)
Squiggle Tag 33
North Dakota State University
12
Test Results
(reminder)
Rampart tag 29
North Dakota State University
13
Discussion
  • Table 3 showed that a LF tag placed directly on
    the M-tag reduced the read range by 67.27.
  • Table 4 showed that the LF tag placed near the
    squiggle tag reduced the read range by 91.84.
  • The Rampart-line was less affected by the LF tag.

North Dakota State University
14
Discussion
  • In all cases by moving the LF tag to the edge of
    the UHF tags the read range could be recovered.
  • The trade-off to moving the LF tag to the edge of
    the UHF tag is a larger footprint.

North Dakota State University
15
Conclusion
  • A dual frequency (UHF and LF) tag has been
    introduced.
  • The read range of each tag was determined in the
    presence of mutual coupling.
  • In several instances the read range of the UHF
    tag was substantially decreased (91.84).

North Dakota State University
16
Conclusion
  • In all instances is was shown that most of the
    read range could be recovered by moving the LF
    tag to the same plane of the UHF tag

North Dakota State University
17
Questions
  • Thank you for listening

North Dakota State University
18
References
19
References
20
References
21
References
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