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Passive sensor system powered by wireless energy transmission

Correia, R. ; Carvalho, N.B.C.

Instituto de Telecomunicações, Universidade de Aveiro

Patent Nr.: US10867137 B2

Type: Patent

Regional Coverage: PCT

Grant Status: Granted

Priority Date: 05-06-2019

Filing Date: 05-06-2019

Granting Date: 15-12-2020

Country: United States

Abstract
A passive sensor network constituted by a reader ( 5 ) , wire less energy emitters ( 2 ) , and fully passive sensors ( 1 ) is described . The passive sensors allow continuously the data collection and transfer thereof whenever requested by the reader , via backscatter at a frequency ( 4 ) , and in parallel the reception of energy from the transmitters ( 3 ) . Each sensor integrates an antenna , two impedance matching networks , a semiconductor , a microcontroller and one or more sensors that do not require the use of their own power supply or batteries . The reader ( remote unit ) initiates the comunica tion process . This communication is achieved by sending radio frequency commands recognized by the passive sem sors . These sensors , upon receiving the commands from the
reader , initiate the back transmission of data according to the received command . The power transmitters are used to allow continuous power supply of the passive sensors .