Communications: electrical – Selective – Interrogation response
Reexamination Certificate
2006-08-15
2006-08-15
Zimmerman, Brian (Department: 2635)
Communications: electrical
Selective
Interrogation response
C375S340000, C375S261000, C455S189100
Reexamination Certificate
active
07091828
ABSTRACT:
The present invention includes phase shifters, interrogators, methods of shifting a phase angle of a signal, and methods of operating an interrogator. One aspect of the present invention provides a phase shifter including a first power divider configured to receive a signal and provide plural quadrature components of the signal; plural mixers coupled with the first power divider and configured to scale the quadrature components using a phase shift angle; and a second power divider coupled with the mixers and configured to combine the scaled quadrature components to shift the phase angle of the input signal by the phase shift angle.
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B.P. Lathi, Modem Digial and Analog Communication Systems, 1998, Oxford University Press, pp. 227-229.
Greeff Roy
Ovard David K.
Wells St. John P.S.
Zimmerman Brian
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