Surface Sensor Network Using Inductive Signal Transmission Layer

Abstract

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

3D Beamforming Coupler for 2D Waveguides Using Dielectric Scatterer Array

“…It has a conductive mesh layer and a ground layer insulated by a dielectric substrate. The lattice period of the mesh is fabricated sufficiently shorter than the guided wavelength so that it works as an inductive surface on average [1]. In this paper, we consider a guided mode that travels one-dimensionally in the x-direction and has a uniform wavefront along the y-direction.…”

“…Recently, the concept of Two-Dimensional Communication (2DC) has been proposed as a new class of wireless technology in which two-dimensional surface-waveguides are used for microwave transmission [1]. By confining microwave propagation two-dimensionally, high-efficient, leakage-secure, and interference-free wireless communications become available on the two-dimensional surface.…”

Two-dimensional communication of networked devices through a single conductive surface

“…We start with expression (8), which shows the potential at a point P in a finite plane caused by a current source I 0 injected at a given point, for example T1. By superposition, we obtain the potential at P when there is a current sink of value -I 0 at another point, for example T2.…”

How Tactile Sensors Should Be?

“…Another communicating device, Two-Dimensional Signal Transmission (2DST), is developed by Shinoda, et al (Shinoda, et al 2007). This device realizes the communication between each element without wiring them independently.…”