In this paper, we report the latest results of our two-dimensional communication project. In the system we show here, the sensor node that touches the surface of a Two-Dimensional Signal Transmission sheet (2DST sheet) establishes the connection. The system allows free location of the sensor node, and proximity (non-contact) connection is realized stably. The structure of 2DST sheet is simple and realized with various materials at low cost. Since the sensor nodes communicate with electromagnetic waves confined in two-dimensional medium, they are free from the interference from the nodes apart from the sheet. Powering with microwave through the sheet is also possible. Keywords-sensor network; surface LAN; two-dimensional communication I. INTRODUCTIONPhysical connection of a large number of sensors is one of key issues in sensor networking in rooms, vehicles, and clothes. Radio connection is often the method that minimizes the cost of the sensor placement, and in some cases, the only way to distribute sensors over a large area of farmland and mountainous field. In those applications, the main research theme of sensor network is communication protocols to extremely save the energy consumptions under limited batteries.In communication within a room-size or smaller area, we can suppose preferable physical forms of connection other than wireless communication. Surface LAN realized by two-dimensional signal transmission (2DST [6][7][8][9]]) is a reasonable communication form that realizes high density placement of sensors enjoying wide band communication. In this paper, we report the latest results of our 2DST project. In the proposed system, the sensor node that touches the surface of a 2DST sheet establishes the connection. The system allows free location of the sensor node where proximity (non-contact) connection is realized stably.In communication of 2DST, the sensor nodes communicate using microwave which propagates in two-dimensional sheet. The first merit of 2DST is that the communication is free from the interference [1] from unexpected signals outside of the room. The sensors belonging to a 2DST sheet is also harmless to the sensors apart from the sheet. The second important merit
This paper proposes a wireless power supply method to ubiquitous small robots using microwaves propagated in a two-dimensional waveguide (2DW). A robot working anywhere on a 2DW sheet receives the power from the sheet. The communication signal is also transmitted through the identical sheet. The structure of 2DW sheet is simple and realized with various materials at low cost. Since the microwave power is confined inside the 2DW sheet, it enables safe power transmission and communication without strong interference with the space outside the sheet.
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