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Our group has proposed a new communication technology named ldquotwo-dimensional communicationrdquo for high-density indoor sensor networks. In this paper, we propose a method to detect the positions and orientations of sensor nodes placed on the two-dimensional signal transmission sheet (2DST sheet). First, we introduce the scheme of encoding the position information on the 2DST sheet. Next, we analyze the electromagnetic field modulation by the conductive mesh pattern on the 2DST sheet, and describe the proposed method that determines the sensor locations from the measured electric field pattern. Finally, we show the results of several fundamental experiments to confirm this principle.