A low cost flexible passive UHF RFID tag for sensing moisture based on antenna polarization

Sajal, Sayeed; Atanasov, Yuriy; Braaten, Benjamin D.; Marinov, V.; Swenson, Orven F.

doi:10.1109/eit.2014.6871822

Cited by 20 publications

(5 citation statements)

References 8 publications

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“…It can be utilized to perform as wireless sensors, which are easy to manufacture, low cost, and efficient [3,[6][7][8]. Adding sensing capabilities to passive RFID tags has been widely studied [9][10][11][12][13][14], and by tracking changes in the tags' backscattered signals, passive UHF RFID tags have been used for sensing without external sensors, such as strain [15][16][17][18][19], moisture [20][21][22][23][24], pressure [25,26], and especially temperature sensors [27][28][29].…”

Section: Introductionmentioning

confidence: 99%

A Bending Passive RFID Tag as a Sensor for High-Temperature Exposure

Khan

Chen

et al. 2021

International Journal of Antennas and Propagation

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This paper introduces a prototype of a low-energy high-temperature exposure sensor, which is a temperature-sensitive passive UHF RFID tag that bends forward when exposed to warm air. This “Bending Tag” design is based on a simple dipole antenna fabricated from an electro-textile material. The antenna has a 3D-printed substrate, which is constructed from a commercial Thermo Reactive Filament that gets soft when exposed to 50°C for 30 seconds, causing the tag to bend forward and curve. The sensor tag initially has a read range of more than 6 meters throughout the global UHF RFID frequency band. After bending, there is a significant decrease in the read range (to around 2–3 meters), which is caused by the changed backscattered power of the sensor tag. In an office environment, the backscattered power changes from −36 dBm to −43 dBm. The change in a sensor tag-reference tag system as dP% is approximately 70%. Based on these initial results, our bending tag can be further developed to work as a cost-effective low-energy sensor for monitoring high-temperature exposure.

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Section: Introductionmentioning

confidence: 99%

A Bending Passive RFID Tag as a Sensor for High-Temperature Exposure

Khan

Chen

et al. 2021

International Journal of Antennas and Propagation

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“…Further, when a user touches an RFID tag with a finger, the user manifests as a change in phase of the tag's backscattered signal [25,26]. Moreover, integrating versatile sensing options into passive RFID tags has been done [27][28][29][30][31][32], and by tracking changes in the tags' backscattered signals, passive UHF RFID tags have been used, for example, as autonomous strain [33][34][35][36][37] and moisture [38][39][40][41][42] sensors. However, despite the promising results, the presented passive RFID tag-based results have shown that the backscattered signals of passive RFID tags are noisy and unstable and strongly affected by the environment.…”

Section: Introductionmentioning

confidence: 99%

ClothFace: A Passive RFID-Based Human-Technology Interface on a Shirtsleeve

Mehmood

Chen

et al. 2020

Advances in Human-Computer Interaction

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This paper introduces ClothFace, a shirtsleeve-integrated human-technology interface platform, which comprises two wrist antennas and three radio frequency identification (RFID) integrated circuits (ICs), each with a unique ID. The platform prototype, which is created on a shirtsleeve by cutting the antennas and antenna-IC interconnections from copper tape, can be used for push button and swipe controlling. Each IC can be activated, i.e., electrically connected to the two antennas, by touching the IC. These ICs can act as wireless input buttons to the technology around us. Due to the used passive ultrahigh-frequency (UHF) RFID technology, there is no need for clothing-integrated energy sources, but the interface platform gets all the needed energy from an external RFID reader. The platform prototype was found to be readable with an external RFID reader from all directions at distances of 70–80 cm. Further, seven people giving altogether 1400 inputs tested the prototype sleeves on a table and on body. In these first tests, 96–100% (table) and 92–100% (on-body) success rates were achieved in a gamelike testing setup. Further, the platform was proved to be readable with an off-the-shelf handheld RFID reader from a distance of 40 cm. Based on these initial results, this implementation holds the potential to be used as a touch interface blended into daily clothing, as well as a modular touch-based interaction platform that can be integrated into the surfaces of electronic devices, such as home appliances.

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“…Keeping this perspective in mind, a depolarizing nested scatter based chipless humidity sensor tag is examined by placing a thin layer of polyvinyl alcohol in the center of the structure to detect the change in the moisture level of surroundings [29]. A flexible chipless sensor tag using copper resonator is reported in [30]. These reported designs provide flexibility but they are not very compact and suffer from complexity in sensing mechanisms.…”

Section: Introductionmentioning

confidence: 99%

Data-Dense and Miniature Chipless Moisture Sensor RFID Tag for Internet of Things

et al. 2019

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A novel and miniaturized semi-elliptical 20-bit fully passive chipless RFID sensor tag is proposed in this article. The realized sensor tag is made up of semi-elliptical shaped open-end slots within the compact size of 25 mm × 17 mm. The multi-substrate analysis of the proposed tag is examined using non-flexible and flexible materials. The articulated tag configuration is capable of monitoring moisture levels when the largest resonator is covered by a heat-resistant sheet of Kapton HN (DuPontTM). The proposed tag functions in the operational frequency band of 4.1 GHz-16 GHz and possesses the overall bit density of 4.70 bit/cm 2 . The structure is composed of a thin passive substrate layer topped with an active layer of conductive path and is considered as a potential candidate for low-cost identification of the tagged objects. In addition to that, its moisture sensing property and flexible nature make it a reliable smart sensor for conformal applications.

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A low cost flexible passive UHF RFID tag for sensing moisture based on antenna polarization

Cited by 20 publications

References 8 publications

A Bending Passive RFID Tag as a Sensor for High-Temperature Exposure

A Bending Passive RFID Tag as a Sensor for High-Temperature Exposure

ClothFace: A Passive RFID-Based Human-Technology Interface on a Shirtsleeve

Data-Dense and Miniature Chipless Moisture Sensor RFID Tag for Internet of Things

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