| 摘要 |
A passive wireless system for monitoring a protected area. The passive wireless system comprises at least one passive sensor for sensing an event, a reader for receiving signals from the at least one passive sensor, a plurality of exciters disposed within the protected area for transmitting a radio frequency pulse at a variable time interval to the at least one passive sensor, and a controller for controlling each of the plurality of exciters to transmit the radio frequency pulse at the variable time interval. The radio frequency pulse powers the passive sensors.
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