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Radio frequency identification (RFID) systems for the paper industry is an emerging research topic due to the need for an automated identification system for the paper industry which would carry on the identification codes of paper and board reels throughout their life cycle. This paper discusses the application of passive ultra-high frequency (UHF) RFID(More)
—This paper presents a novel inkjet-printed humidity sensor tag for passive radio-frequency identification (RFID) systems operating at ultrahigh frequencies (UHFs). During recent years, various humidity sensors have been developed by researchers around the world for HF and UHF RFID systems. However, to our best knowledge, the humidity sensor presented in(More)
Wearable RFID tags and wireless sensors can be used for on-body and human monitoring applications. Embroidery with conductive thread provides compelling means for the fabrication of seamlessly garment-integrable antennas for wearable tags and wireless sensors. In this paper, we present the fabrication of fully assembled tags based on embroidered dipole-type(More)
—Passive UHF RFID tag consists of a microchip attached directly to an antenna. Proper impedance match between the antenna and the chip is crucial in RFID tag design. It directly influences RFID system performance characteristics such as the range of a tag. It is known that an RFID microchip is a nonlinear load whose complex impedance in each state varies(More)
This paper investigates the effects of conductor thickness on the performance of passive RFID tags fabricated using inkjet technology. Judging from the obtained results the performance of printed tags continues to increase as more conductive layers are added. However, the results show that the amount of performance improvement reduces with increase of the(More)
This paper presents a novel temperature sensor tag for passive UHF RFID systems and discusses a method to perform measurements in practice. The developed sensor tag is fabricated from cost-efficient and commercially available materials. Distilled water is used as the temperature sensitive material instead of the more traditional semi-conducting materials.(More)
This paper presents a printable humidity sensor for RFID systems at UHF frequencies. The sensor is printed onto Kapton HN polyimide substrate using silver ink. The sensor measures humidity capacitively through the permittivity change in the polyimide. The actual measurement result is acquired from the tag using a threshold power sweep performed by the(More)
In Wearable Well-Being project PUHVI, HipGuard system for patients recovering from hip surgery was developed. Novel wireless sensors having 3-axis acceleration and 3-axis magnetic sensors are used to measure patient's hip and leg position and rotation. Furthermore, capacitive insole sensors are used to measure the force between foot and a shoe. This paper(More)