Electromagnetism and Transmission Medium

 Electromagnetism and Transmission Medium Essay

I. History

Human society is entering a time of ubiquitous computing, once networks are seamlessly interconnected and information is always accessible at our fingertips. The practical rendering of all-pervasive services needs three levels of connectivity: Wide Area Systems (WAN), commonly via the Internet, to remotely connect all types of severs and ports; Local Area Networks (LAN), commonly via Ethernet, or Wireless connectivity of most the information and communication home appliances in office buildings and homes; and Human being Area Sites (HAN) for connectivity to personal information, press and conversation appliances inside the much smaller world of common daily activities-- the last 1 meter. NTT's RedTacton is known as a break-through technology that, for the first time, enables reliable high-speed HAN. In the past, Wireless, infrared marketing communications (IrDA), car radio frequency IDENTIFICATION systems (RFID), and other systems have been suggested to solve the " previous meter" on-line problem. Nevertheless , they each have got various critical technical limitations that restrict their utilization, such as the precipitant, precipitate fall-off in transmission acceleration in multi-user environments creating network congestion.

2. Technical

RedTacton takes a different specialized approach. Rather than relying on electromagnetic waves or perhaps light surf to carry info, RedTacton uses weak electrical fields on the surface of the body (*4) as a indication medium. A RedTacton transmission device couples with extremely poor electric fields on the area of the body. The poor electric fields pass through your body to a RedTacton receiver, where weak electric powered fields influences the optical properties associated with an electro-optic very. The extent to which the optical houses are improved is detected by laser light which can be then converted to an electrical signal by a detector circuit. The three major practical features of RedTacton are highlighted below. (1) A marketing communications path can be created with a simple touch, instantly initiating the flow of information between a body-centric electronic device and your computer that is inlayed in the environment. For example , a couple equipped with RedTacton devices may exchange info just by nervous-looking hands. A variety of natural man actions -- grasping, seated, walking, or standing in a particular place -- can be used to trigger RedTacton to get started on a networked process.

(2) Using a RedTacton electro-optic sensor, dual end communication is usually supported among any two points on the body for a throughput of up to twelve Mbps. Connection is not just limited to the surface of the physique, but can travel through the user's clothing to a RedTacton device in a pocket or perhaps through shoes and boots to communicate with a RedTacton device inserted in the flooring. Unlike cellular technologies, the transmission speed does not damage even in the presence of large crowds of people almost all communicating as well in getting together with rooms, auditoriums or stores. Because the body system surface is the transmission route, increasing the number of connected users directly boosts the available volume of individual connection channels.

(3) RedTacton can utilize a wide range of elements as a transmitting medium, provided that the material is conductive and dielectric, which include water and other liquids, different metals, specific plastics, cup, etc . Using ordinary structures such as desks and surfaces that are familiar and readily available, one could easily construct a seamless communication environment at very low expense using RedTacton. (Note that constraints are imposed by the length and environment from the propagating director, and by the thickness in the dielectric. )

3. Details

RedTacton can achieve duplex communication over the human body in a optimum speed of 10 Mbps.

1 ) The RedTacton transmitter induces a poor

electric field on the area of the body.

2 . The electric field sensor (transistor or photonic

electric power field sensor) detects electric powered field...

References: 1] T. G. Zimmerman, " Personal Region Networks: Near-field intrabody interaction, ” IBM Systems Log, Vol. thirty-five, Nos. 3& 4, pp. 609, 617, 1996.

[2] T. Nagatsuma and M. Shinagawa, " Photonic dimension technologies intended for high-frequency electronic devices, ” NTT REVIEW, Volume. 14, Number 6, pp. 12-24, 2002.

[3] M. Shinagawa, " Development of Electro-optic Sensors intended for Intra-body Conversation, ” NTT Technical Assessment, Vol. two, No . 2, pp. 6-11, 2004.


[5] M. Shinagawa, M. Fukumoto, K. Ochiai, and L. Kyuragi, " A nearfield-sensing transceiver pertaining to intra-body conversation based on the electro-optic effect, ” IEEE Trans. I AM, Vol. 53, No . 6th, pp. 1533-1538, 2004.


[7] M. Mizoguchi, T. Okimura, and A. Matsuda, " Comprehensive Commercialization Functions, ” NTT Technical Review, Vol. 3, Number 5, pp.

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