Phase modulation for backscatter transponders
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United States of America Patent
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Issued Date -
Oct 5, 2006
app pub date -
Apr 4, 2005
filing date -
Apr 4, 2005
priority date (Note) -
Abandoned
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Abstract
A radio frequency identification system having a passive backscatter transponder employing phase modulation. The transponder selectively couples its antenna to one of two or more impedances, wherein the impedances each produce a reflected signal when coupled to the antenna in the presence of a continuous RF wave from the reader. The reflected signals produced by the impedances are out-of-phase with each other. The transponder switches between impedances to encode transponder information into a reflected signal through phase shifts in the reflected signal. The reader detects the phase shifts in the reflected signal received at the reader to obtain the transponder information. The impedances are selected so as to produce reflected signals having a desired phase relationship or difference and having sufficient amplitude.
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