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Battery-free wireless light-sensing tag based on a long-range dual-port dual-polarized RFID platform

Battery-free wireless light-sensing tag based on a long-range dual-port dual-polarized RFID platform
Battery-free wireless light-sensing tag based on a long-range dual-port dual-polarized RFID platform

Radio frequency identification (RFID) represents an emerging platform for passive RF-powered wireless sensing. Differential Multi-port RFID systems are widely used to enable multiple independent measurands to be gathered, or to overcome channel variations. This paper presents a dual-port/dual-integrated circuit (IC) RFID sensing tag based on a shared aperture dual-polarized microstrip antenna. The tag can be loaded with different sensors where the received signal strength indicator (RSSI) of one IC is modulated using a sensor, and the other acts as a measurand-insensitive reference, for differential sensing. The 868 MHz tag maintains a minimum unloaded read range of 14 m insensitive to deployment on metals or lossy objects, which represents the longest reported range of a multi-port RFID sensing tag. The tag is loaded with a light-dependent resistor (LDR) to demonstrate its functionality as a battery-less wireless RFID light sensor. Following detailed RF characterization of the LDR, it is shown that the impedance, and consequently the RSSI, of the sensing tag are modulated by changing the light intensity, whereas the reference port maintains a mostly unchanged response for a correlated channel. The proposed tag shows the potential for channel variations-tolerant differential RFID sensing platforms based on polarization-diversity antennas.

Internet of Things, RFID, antennas, differential RFID, impedance matching, light sensing, microstrip antennas, multi-port RFID, patch antennas, wireless sensor node
1424-8220
Wagih, Mahmoud
7e7b16ba-0c64-4f95-bd3c-99064055f693
Weddell, Alex S.
7fb964f4-6ca7-401d-8f57-f4355055eb8b
Beeby, Stephen
ba565001-2812-4300-89f1-fe5a437ecb0d
Wagih, Mahmoud
7e7b16ba-0c64-4f95-bd3c-99064055f693
Weddell, Alex S.
7fb964f4-6ca7-401d-8f57-f4355055eb8b
Beeby, Stephen
ba565001-2812-4300-89f1-fe5a437ecb0d

Wagih, Mahmoud, Weddell, Alex S. and Beeby, Stephen (2022) Battery-free wireless light-sensing tag based on a long-range dual-port dual-polarized RFID platform. Sensors, 22 (13), [4782]. (doi:10.3390/s22134782).

Record type: Article

Abstract

Radio frequency identification (RFID) represents an emerging platform for passive RF-powered wireless sensing. Differential Multi-port RFID systems are widely used to enable multiple independent measurands to be gathered, or to overcome channel variations. This paper presents a dual-port/dual-integrated circuit (IC) RFID sensing tag based on a shared aperture dual-polarized microstrip antenna. The tag can be loaded with different sensors where the received signal strength indicator (RSSI) of one IC is modulated using a sensor, and the other acts as a measurand-insensitive reference, for differential sensing. The 868 MHz tag maintains a minimum unloaded read range of 14 m insensitive to deployment on metals or lossy objects, which represents the longest reported range of a multi-port RFID sensing tag. The tag is loaded with a light-dependent resistor (LDR) to demonstrate its functionality as a battery-less wireless RFID light sensor. Following detailed RF characterization of the LDR, it is shown that the impedance, and consequently the RSSI, of the sensing tag are modulated by changing the light intensity, whereas the reference port maintains a mostly unchanged response for a correlated channel. The proposed tag shows the potential for channel variations-tolerant differential RFID sensing platforms based on polarization-diversity antennas.

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More information

Accepted/In Press date: 21 June 2022
e-pub ahead of print date: 24 June 2022
Published date: 1 July 2022
Additional Information: Funding Information: Funding: This work was supported by the UK Engineering and Physical Sciences Research Council (EPSRC) under Grants EP/P010164/1. Publisher Copyright: © 2022 by the authors. Licensee MDPI, Basel, Switzerland.
Keywords: Internet of Things, RFID, antennas, differential RFID, impedance matching, light sensing, microstrip antennas, multi-port RFID, patch antennas, wireless sensor node

Identifiers

Local EPrints ID: 468298
URI: http://eprints.soton.ac.uk/id/eprint/468298
ISSN: 1424-8220
PURE UUID: 1c253ca6-f3df-4560-aaba-d10d37438fa9
ORCID for Mahmoud Wagih: ORCID iD orcid.org/0000-0002-7806-4333
ORCID for Stephen Beeby: ORCID iD orcid.org/0000-0002-0800-1759

Catalogue record

Date deposited: 09 Aug 2022 17:01
Last modified: 22 Apr 2024 17:18

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Contributors

Author: Mahmoud Wagih ORCID iD
Author: Alex S. Weddell
Author: Stephen Beeby ORCID iD

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