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  • Inkjet-Printed Electromagne...
    Sungjin Choi; Eom, Seunghyun; Tentzeris, Manos M.; Sungjoon Lim

    Journal of microelectromechanical systems, 2016-Oct., 2016-10-00, 20161001, Letnik: 25, Številka: 5
    Journal Article

    In this paper, an inkjet-printed electromagnet-based touchpad employing spiral resonators is proposed. The proposed touchpad is fabricated by a direct patterning method using an inkjet printer with a conductive silver nanoparticle ink. The conductive patterns are easily printed on a paper substrate and sintered for achieving good conductivity. The proposed touchpad is composed of two spiral resonators that resonate at 0.94 GHz (f 1 ) and 1.83 GHz (f 2 ), respectively. When the first resonator is touched, f 1 decreases from 0.94 to 0.81 GHz because of electromagnetic (EM) coupling between the finger and the spiral resonator. Similarly, when the second resonator is touched, f 2 decreases from 1.83 to 1.55 GHz. Owing to the EM coupling distance between the spiral resonator and the finger, the frequency changes although the finger does not reach beyond a height of 1.27 mm on the spiral resonator. The performance of the proposed touchpad is validated using simulation and measurement results.