A first look at Dylan.Classes,functions,and modules by Strassman S.

By Strassman S.

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1, was developed by another company, Wherenet, in the 1990s and serves commercial tracking requirements. People are important, mobile, and expensive (as any parent knows), so identifying and tracking them can make economic sense. Tracking of people using radio technology has become practical in the 1990s and has been implemented in several special circumstances. Many corporate employees now carry short-range radio badges, typically using inductively coupled transponders, to allow admission into company facilities.

The voltage is rectified by a diode (a device which only allows current to flow in one direction), and the resulting signal is smoothed using a storage capacitor to create a more-or-less constant voltage that is then used to power the tag’s logic circuitry and memory access. 17: Schematic Depiction of Simple Passive RFID Tag. circuitry is always nonvolatile since the tag power is usually off. A similar rectification circuit, using a smaller capacitance value to allow the voltage to vary on the timescale of the reader data, is used to demodulate the information from the reader.

56 MHz, 50 cm diameter antenna) vs. Radiative Coupling (900 MHz), With Associated Power and Time Delays. to the reader; the total round-trip transit time, about 22 ns in the example shown, is much longer than the RF cycle time. The reader unfamiliar with these terms may find it useful to view the animation “Inductive and Radiative Coupling” on the CD accompanying the book. The distinction between inductive and radiative coupling has important implications for the behavior of RFID tags. 11, inductive coupling between the reader and tag falls rapidly as the tag moves away from the reader antenna.

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