Beam-steering backscatter circuit for integrated tag device
AssigneeThe Regents of the University of California
InventorsShih-Kai Kuo, Manideep Dunna, Dinesh Bharadia, Patrick Mercier
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Abstract
A beam-steering backscatter circuit in an integrated tag device. The circuit includes an antenna array and SP4T reflector array configured to receive and transmit through the antenna array. A baseband phase-shifting module modulates an incident signal based upon tag data to create an output signal and re-radiates the output signal with a controllable angle of direction through the SP4T reflector array. A phase locked loop synchronized with a wake-up receiver provides an intermediate frequency (IF) clock to the baseband phase shifting-module.
Claims9
A beam-steering backscatter circuit in an integrated tag device, comprising:
- an antenna array and SP4T reflector array configured to receive and transmit through the antenna array;
- a baseband phase-shifting module that modulates an incident signal based upon tag data to create an output signal and re-radiates the output signal with a controllable angle of direction through the SP4T reflector array;
- and
- a phase locked loop synchronized with a wake-up receiver, the phase locked loop providing an intermediate frequency (IF) clock to the baseband phase shifting-module.
A beam-steering backscatter circuit in an integrated tag device comprising:
- a wake-up receiver;
- and
- a phase-locked loop enabled by the wake-up receiver;
- and
- a backscatter transmitter enabled with the phase-locked loop, wherein the backscatter transmitter comprises a beam steering modulator operating at an intermediate frequency to separately provide multiple phase versions of a backscatter response signal to separate antennas in an antenna array through an SP4T reflector array.
Dependencies are inferred from the claim text.