Measuring power
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United States of America Patent
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Jun 19, 2012
Grant Date -
Feb 4, 2010
app pub date -
Aug 7, 2009
filing date -
Feb 8, 2007
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
One aspect of the invention includes a directional coupler having a coupling factor in the forward direction determined from the equation Cf=Cf·ejφCf, a coupling factor in the reverse direction determined from the equation Cr=Cr·ejφCr, an isolation in the forward direction determined from the equation If=If·ejφIf, and an isolation in the reverse direction determined from the equation Ir=Ir·ejφIr, wherein at least one condition is met from among the group consisting of: (1) the absolute value of Δφ=φCr+φCf−(φIr+φIf) being less than or equal to 20°,
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