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6 An Example of Frequency Shift Keying 0 0 1 1 0 1 0 Digital Data Signal Modulated Signal If, instead of varying amplitude or frequency, you vary the phase of the carrier wave to encode data signal, you are using phase modulation. 31 32 Chapter 2 • The Physics of RFID Phase Modulation and Phase Shift Keying Phase modulation (PM) is that kind of modulation in which information is represented by variations in the phase of the carrier wave. Unlike AM and FM, PM is not very widely used. When the data signal is a digital signal, the corresponding phase modulation technique is called phase shift keying.

Dielectric Effects Dielectric effects refer to a medium’s capacity to retain charge. As a result, an electromagnetic wave traveling through a dielectric medium is slowed down. The strength of this effect is measured by a quantity called the dielectric constant whose value is different for different materials. Dielectric effects also detune the signal—that is, shift its frequency to a value that is not in resonance with the frequency for which the antenna is tuned. Diffraction Diffraction refers to the bending of an EM wave when it strikes the sharp edges or when it passes through narrow gaps.

For example: 1000 = 103 => 3 = log10 1000 The base 10 is a default for the term log; that is, log (1000) means log of 1000 to the base 10. After understanding the definition of log, you need to remember three more formulae for the log function. The first formula is: log xn = n * logx Physics, Math, and RFID: Mind the Gap • Chapter 1 For example: log 1000 = log 103 = 3 * log 10 The second formula is: log (x*y) = log x + log y For example: log 1000 = log(10*100) = log 10 + log 100 The third formula is: log (x/y) = log x log y For example: log 100 = log(10000/100) = log 10000 − log 100 An example of use of your knowledge of logarithm is the decibel unit.

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

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