Journal
MICROELECTRONIC ENGINEERING
Volume 88, Issue 11, Pages 3293-3299Publisher
ELSEVIER
DOI: 10.1016/j.mee.2011.08.010
Keywords
R2R; Gravure; Inkjet; Printed electronics; RF tag
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Funding
- Korea Foundation for International Cooperation of Science and Technology (KICOS)
- VTT
- Konkuk University
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The fabrication of passive circuitry by gravure and inkjet printing is studied. A chipless inductively coupled RF resonant tag is analyzed as a test structure. A floating-bridge layout is employed to provide high yield when fabricated by roll-to-roll (R2R) printing. The conducting first layer and insulating second layer are R2R gravure printed with silver nanoparticle ink and a thermally cross-linkable dielectric ink, respectively. Above 10 MS/m conductivity is obtained for the first layer, which passes three times through the 5 m long drying unit at 5 m/min speed. The floating bridge is inkjet printed with silver nanoparticle ink and the prototype tag is measured over a reading distance of ca. 2 cm. An equivalent circuit model is presented and the model parameters are optimized to obtain a best fit to the measured frequency response. This indirect measurement provides an estimate of 4.3 mu m for the thickness of the dielectric layer sandwiched between the conducting top and bottom layers. Application possibilities for the all-printed RF resonant tag are outlined. (C) 2011 Elsevier B.V. All rights reserved.
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