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Conductive Inkjet-Printed Antennas on Flexible Low-Cost Paper-Based Substrates for RFID and WSN Applications,” IEEE Antennas and Propagation Magazine, Vol. 51, No. 3, June 2009, pp. 13–23. , New York: John Wiley & Sons, 2005. , RFID Applied, New York: John Wiley & Sons, 2007. html. org/wiki/Manchester_code. pdf. , New York: John Wiley & Sons, 2003. 1 Use of Sensors A sensor is a device that measures a physical quantity and converts it into a signal, which can be observed by an instrument. Therefore, sensors function as part of the interface between the physical world and electrical devices.

A • • • • transition occurs at the beginning of each clock cycle. A binary “0” is represented by an additional transition at the middle of the clock cycle and a binary “1” is represented by no transition at the middle of the clock cycle. Unipolar RZ encoding: In this encoding method a binary “1” is represented by a high logic level during the first half of the clock cycle and a binary “0” is represented by a low logic level for the duration of the clock cycle. Differential encoding: In differential encoding a binary “1” changes the logic level and a binary “0” causes no change in the logic level.

6. These protocols define the commands used between the reader and tag within the read range, how the memory is organized, and anticollision algorithms. For instance a passive tag memory layout is composed of four main sections as defined in Gen2 protocols, these are: reserved, electronic product code, tag identification, and user memory banks. Tag commands are also defined by these protocols, and in our example (Gen2), the reader issues commands to tags within the read range to access data found in the tags.

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MRL 1 2


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