RFID repeater for range extension in modulated backscatter systems

摘要

A backscatter tag system including a tag having tag circuitry and a reader for transmitting a command signal to the tag includes an energizer node for transmitting an energy signal to the tag to energize the tag and provide energy for operating the tag circuitry and for emitting a backscatter signal by the tag. The energizer node includes an energizer receiver for receiving the command signal from the reader to provide a received command signal and an energizer transmitter for transmitting the received command signal from the reader to the tag. The energizer node transmits both the energy signal and the received command signal to the tag. The energizer transmitter can transmit a sinusoidal signal, a frequency hopping signal, a spread spectrum signal, or a frequency shifted signal to the tag. The backscatter tag circuitry can include a processor.

主权项

1. A backscatter tag system, comprising:
a reader for transmitting signals, wherein the transmitted signals include a command signal and an energy signal; at least one tag having a tag circuitry, wherein the at least one tag is a multimode tag configured to operate (1) in a closed loop mode when the at least one tag detects and demodulates the transmitted signals, or (2) in an open loop mode when the at least one tag fails to detect the transmitted signals within a predefined time period; and an energizer node:
receiving the energy signal from the reader and transmitting the energy signal to the at least one tag; andreceiving the command signal from the reader, wherein the energizer node performs a predefined function based on content of the received command signal.