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  • 1.
    Andersson, Henrik
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Electronics Design.
    Sidén, Johan
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Electronics Design.
    Skerved, Vincent
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Electronics Design.
    Li, Xiaotian
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Electronics Design.
    Gyllner, Linnea
    Iniss Triab AB, S-16250 Vällingby.
    Soldering Surface Mount Components onto Inkjet Printed Conductors on Paper Substrate using Industrial Processes2016In: IEEE Transactions on Components, Packaging, and Manufacturing Technology, ISSN 2156-3950, E-ISSN 2156-3985, Vol. 6, no 3, p. 478-485, article id 7422029Article in journal (Refereed)
    Abstract [en]

    This paper describes mounting of standard surface mount component packages on a paper substrate using an industrial solder process with a low-temperature solder. The use of paper as a substrate for printed flexible electronics is becoming more and more widespread as an alternative to the more commonly used plastic substrates, such as polyethylene and polyimide. Paper has the benefits of being environmentally friendly, recyclable, and renewable, as well as inexpensive. It is shown that it is possible to mount standard surface mount device components on paper substrates using low-temperature solder in an industrial soldering process. The contact resistances obtained are mostly low, although the yield of functioning contacts is low. The reason is cracking of the substrate coating layer that goes through the printed silver tracks. It was observed that the cracks appear mostly close to the contact pads, the most likely cause is thermal mismatch between the coating layer and solder and also thermal expansion of the photo paper resin coating. The smallest component package size, 0201, resulted in the highest yield of >80% with decreasing yield for larger package sizes.

  • 2.
    Sidén, Johan
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Electronics Design.
    Skerved, Vincent
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Electronics Design.
    Andersson, Henrik
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Electronics Design.
    Sensing and Actuating with NFC2015Conference paper (Refereed)
    Abstract [en]

    Near Field Communication (NFC) is currently being widely launched as a new wireless feature in cell phones, allowing NFC equipped phones to act as 13.56 MHz RFID readers or as tags as well as to utilize NFC for short range inter-phone communication. While many applications based on the most basic NFC cell phone technology have started to appear, this work addresses the possibility to not only retrieve static data such as ID numbers and web addresses from NFC tags but also sensor data. The work shows how commercially available NFC chips can be used for communicating sensor data to a smart phone, either directly through existing analogue input ports or by powering and communicating with an additional microcontroller. The work also shows how an NFC tag can operate as an actuator rather than a sensor, which is exemplified by the construction of a bi-stable switch capable of switching 250 Volt / 2 Ampere. Power transfer capability via the NFC interface is characterized with coils designed for different resonant frequencies as is inkjet printed coils on paper substrate where components are soldered with a low temperature solder compound.

  • 3.
    Sidén, Johan
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Skerved, Vincent
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Forsström, Stefan
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Gao, Jinlan
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Nilsson, Hans-Erik
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Kanter, Theo
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Gulliksson, Mikael
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Home Care with NFC Sensors and a Smart Phone2011In: ACM International Conference Proceeding Series, ACM Press, 2011Conference paper (Refereed)
    Abstract [en]

    The world's aging population and limited hospital resources together with advancements in information technology provides a thorough basis for further development of tele-healthcare and assisted living. For ordinary people, and especially elderly people, to be diagnosed and treated in their homes there is a definite need for technical equipment that is extremely easy to handle. One way to facilitate tele-healthcare is to take advantage of modern cell phone technology and the infrastructure surrounding these units. Many elderly people are today comfortable with using cell phones and even advanced smart phones can be purchased to a cost that is low compared to corresponding specialized medical equipment. The concept presented in this work is based upon Near Field Communication (NFC), a wireless feature that is currently being widely launched in cell phones. Amongst other capabilities, NFC technology allows a phone to act as a 13.56 MHz RFID reader. This work shows how NFC-equipped phones can be used to read passive NFC tags that in turn are equipped with general resistive sensors and how sensor data are read and communicated to a web server without the need to push a single button. © 2011 ACM.

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