Power margin reduction in linear passive UHF RFID tag arrays

Qi Zhang; Michael Crisp; Ian H. White; Richard V. Penty

doi:10.1109/RFID-TA.2014.6934248

Power margin reduction in linear passive UHF RFID tag arrays

Qi Zhang, Michael Crisp, Ian H. White, Richard V. Penty

Vice Chancellor's Office

University of Cambridge

Research output: Chapter or section in a book/report/conference proceeding › Chapter in a published conference proceeding

7 Citations (SciVal)

Abstract

This paper studies the power margin reduction in linear passive UHF RFID tag arrays due to proximity effects. It is shown experimentally that a 40% reduction in tag power margin occurs when two tags are placed with a separation of less than 2cm. Major causes of tag sensitivity degradation due to proximity in arrays are analyzed by experiment and simulation, including tag detuning, shadowing and re-emission cancellation. It is shown that tag detuning has a significant effect when tags are separated by less than 7mm. At larger separations in excess of 1cm, the tag shadowing effect and interactions between the backscattered waves cause more significant degradation for large tag arrays.

Original language	English
Title of host publication	2014 IEEE RFID Technology and Applications Conference, RFID-TA 2014
Publisher	IEEE
Pages	306-311
Number of pages	6
ISBN (Electronic)	9781479946808
DOIs	https://doi.org/10.1109/RFID-TA.2014.6934248
Publication status	Published - 23 Oct 2014
Event	2014 IEEE RFID Technology and Applications Conference, RFID-TA 2014 - Tampere, Finland Duration: 8 Sept 2014 → 9 Sept 2014

Conference

Conference	2014 IEEE RFID Technology and Applications Conference, RFID-TA 2014
Country/Territory	Finland
City	Tampere
Period	8/09/14 → 9/09/14

Keywords

close proximity
detuning
passive ultra high frequency (UHF)
radio frequency identification (RFID)
re-emission cancellation
read range
shadowing

ASJC Scopus subject areas

Computer Networks and Communications
Computer Science Applications
Electrical and Electronic Engineering

Access to Document

10.1109/RFID-TA.2014.6934248

Cite this

@inproceedings{670f691093da4fe38a93fa02f1199662,

title = "Power margin reduction in linear passive UHF RFID tag arrays",

abstract = "This paper studies the power margin reduction in linear passive UHF RFID tag arrays due to proximity effects. It is shown experimentally that a 40% reduction in tag power margin occurs when two tags are placed with a separation of less than 2cm. Major causes of tag sensitivity degradation due to proximity in arrays are analyzed by experiment and simulation, including tag detuning, shadowing and re-emission cancellation. It is shown that tag detuning has a significant effect when tags are separated by less than 7mm. At larger separations in excess of 1cm, the tag shadowing effect and interactions between the backscattered waves cause more significant degradation for large tag arrays.",

keywords = "close proximity, detuning, passive ultra high frequency (UHF), radio frequency identification (RFID), re-emission cancellation, read range, shadowing",

author = "Qi Zhang and Michael Crisp and White, {Ian H.} and Penty, {Richard V.}",

year = "2014",

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doi = "10.1109/RFID-TA.2014.6934248",

language = "English",

pages = "306--311",

booktitle = "2014 IEEE RFID Technology and Applications Conference, RFID-TA 2014",

publisher = "IEEE",

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note = "2014 IEEE RFID Technology and Applications Conference, RFID-TA 2014 ; Conference date: 08-09-2014 Through 09-09-2014",

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T1 - Power margin reduction in linear passive UHF RFID tag arrays

AU - Zhang, Qi

AU - Crisp, Michael

AU - White, Ian H.

AU - Penty, Richard V.

PY - 2014/10/23

Y1 - 2014/10/23

N2 - This paper studies the power margin reduction in linear passive UHF RFID tag arrays due to proximity effects. It is shown experimentally that a 40% reduction in tag power margin occurs when two tags are placed with a separation of less than 2cm. Major causes of tag sensitivity degradation due to proximity in arrays are analyzed by experiment and simulation, including tag detuning, shadowing and re-emission cancellation. It is shown that tag detuning has a significant effect when tags are separated by less than 7mm. At larger separations in excess of 1cm, the tag shadowing effect and interactions between the backscattered waves cause more significant degradation for large tag arrays.

AB - This paper studies the power margin reduction in linear passive UHF RFID tag arrays due to proximity effects. It is shown experimentally that a 40% reduction in tag power margin occurs when two tags are placed with a separation of less than 2cm. Major causes of tag sensitivity degradation due to proximity in arrays are analyzed by experiment and simulation, including tag detuning, shadowing and re-emission cancellation. It is shown that tag detuning has a significant effect when tags are separated by less than 7mm. At larger separations in excess of 1cm, the tag shadowing effect and interactions between the backscattered waves cause more significant degradation for large tag arrays.

KW - close proximity

KW - detuning

KW - passive ultra high frequency (UHF)

KW - radio frequency identification (RFID)

KW - re-emission cancellation

KW - read range

KW - shadowing

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DO - 10.1109/RFID-TA.2014.6934248

M3 - Chapter in a published conference proceeding

AN - SCOPUS:84912111382

SP - 306

EP - 311

BT - 2014 IEEE RFID Technology and Applications Conference, RFID-TA 2014

PB - IEEE

T2 - 2014 IEEE RFID Technology and Applications Conference, RFID-TA 2014

Y2 - 8 September 2014 through 9 September 2014

ER -

Power margin reduction in linear passive UHF RFID tag arrays

Abstract

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Keywords

ASJC Scopus subject areas

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