Abstract-We are working toward actualizing a real-time 3D modeling system that uses a sensor network consists of many 1mm 3 -class sensor nodes in plastic clay. This paper focuses on 1mm 3 -class small antenna and discusses the feasibility of near-field communication with such small antennas. In order to clarify communication characteristics for evaluating the feasibility, we designed 1mm 3 -class spiral antennas having three different resonant frequencies and carried out 3D full-wave electromagnetic simulations. When two antennas are embedded in a clay model with 10mm distance, the maximum |S 21 | values at 30MHz, 340MHz, and 1.3GHz are -81.1dB, -69.6dB, and -64.7dB, respectively. This simulation result suggests that the near-field communication with 1mm 3 -class antennas is feasible.
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