April 2016
Intermediate to advanced
430 pages
16h 33m
English
Content preview from RFID and Auto-ID in Planning and Logistics
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366 RFID and Auto-ID in Planning and Logistics
SWR for terminations between these two extremes may be calculated by considering the interaction
of the reected wave with the incident wave to determine the minimum and maximum voltages.
The SWR is simply the ratio of the resistance of the termination and the characteristic impedance
of the line. For example, a 75 Ω load will give an SWR of 1.5 when used to terminate a 50 Ω cable
since 75/50 = 1.5. A 25 Ω resistor will give an SWR of 2 since 50/25 = 2.
The goal is that the impedance for the entire chain from the radio to the antenna is the same,
and the standard for RFID radio equipment is an impe ...
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