Johanna Virkki

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The embedding of radio frequency identification (RFID) tags into plywood boards will enable the identification and tracking of individual plywood boards and end products of plywood. Even more benefits can be achieved by adding sensing functions into these tags. We present tags that are embeddable inside plywood by direct inkjet-printing on pure birch(More)
We present the simulation-based design of UHF RFID tags based on electro-textile antennas and analyze the impact of recurrent washing on their performance through measurements. The antennas were fabricated from silver plated stretchable fabric made of nylon and elastic fibers. We coated half of the tested samples with acrylic spray to compare the influence(More)
—Material choices in electronic devices have a huge impact on the environment. The use of environmental-friendly processes and renewable materials is a growing trend. We present the inkjet-printing of antennas for passive UHF RFID tags on wood, paper, and cardboard. We printed the prototype antennas without surface treatments. We evaluated the performance(More)
The use of passive ultra high-frequency (UHF) radio frequency identification (RFID) integrated into plywood boards is proposed to enable the identification and tracking of individual plywood boards and end products of plywood. For the first time, tags are embeddable inside plywood by direct inkjet-printing tag antennas on pure birch veneer. The use of(More)
Nowadays there is an increasing interest to add functionality in various products and versatile electronics manufacturing methods are needed for different applications. In this study, brush-painting of silver nanoparticle UHF RFID tag antennas directly on wood veneer and polyimide film substrates was examined. Two sintering methods, heat and photonic(More)
We report for the first time the deposition antennas on textiles using the direct write dispensing of a copper ink. We outline the steps of the dispensing process and share our insight on how to control it on the rough and porous textile surface. The well-known heat sintering is not applicable on copper inks. Below we outline the process of intense pulsed(More)
Moisture measurements of the body can be used for healthcare purposes as well as for helping in exercising. In this paper, the suitability of passive UHF RFID technology for moisture sensing is investigated. The technology has a great potential in wearable, comfortable, and wireless moisture sensing systems, although it is not originally used for sensing(More)