Phase shifters, interrogators, methods of shifting a phase angle of a signal, and methods of operating an interrogator
First Claim
Patent Images
1. An interrogator of a backscatter communication system comprising:
- a transmitter configured to output a local continuous wave signal and a radio frequency continuous wave signal; and
a receiver configured to receive the local continuous wave signal and a modulated radio frequency continuous wave signal, the receiver including;
a phase shifter configured to adjust a phase angle of the local continuous wave signal by a phase shift angle, the phase shifter including a first power divider configured to provide a first component and a second component of the local continuous wave signal, plural mixers configured to scale the first component and the second component using the phase shift angle, and a second power divider configured to combine the scaled first component and the scaled second component to provide an adjusted continuous wave signal; and
a coupler configured to combine the adjusted continuous wave signal and the modulated radio frequency continuous wave signal.
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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.
110 Citations
16 Claims
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1. An interrogator of a backscatter communication system comprising:
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a transmitter configured to output a local continuous wave signal and a radio frequency continuous wave signal; and
a receiver configured to receive the local continuous wave signal and a modulated radio frequency continuous wave signal, the receiver including;
a phase shifter configured to adjust a phase angle of the local continuous wave signal by a phase shift angle, the phase shifter including a first power divider configured to provide a first component and a second component of the local continuous wave signal, plural mixers configured to scale the first component and the second component using the phase shift angle, and a second power divider configured to combine the scaled first component and the scaled second component to provide an adjusted continuous wave signal; and
a coupler configured to combine the adjusted continuous wave signal and the modulated radio frequency continuous wave signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of operating a coherent interrogator of a backscatter communication system comprising:
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outputting a radio frequency continuous wave signal;
providing a local continuous wave signal;
receiving a modulated continuous wave signal;
providing a phase shift angle;
adjusting the phase of the local continuous wave signal using the phase shift angle to provide an adjusted continuous wave signal, the adjusting including;
providing the local continuous wave signal into a first component and a second component;
scaling the first component using the phase shift angle;
scaling the second component using the phase shift angle; and
combining the first component and the second component after the scalings to shift the phase angle of the local continuous wave signal by the phase shift angle; and
combining the adjusted continuous wave signal and the modulated continuous wave signal. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification