Intermodulation mitigation technique in an RFID system
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United States of America Patent
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Jan 31, 2017
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N/A
app pub date -
Aug 12, 2014
filing date -
May 26, 2005
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Abstract
When multiple readers for RF transponders have to be placed in close proximity, such as in adjacent lanes of a highway toll barrier, they can be set to operate at different frequencies. When signals from two adjacent ones of the readers interfere, the resulting signal includes interference terms whose frequencies equal the sum of the reader frequencies and the difference between the reader frequencies. To remove such interference terms while passing the desired terms, a tag includes a low-pass or other frequency-selective filter.
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