Patent ID: 9286562
Filing Date: 2016-03-15
CPC Classification: G06K

Claim Text:
1. A sensor system, comprising: an RFID reader; an RFID chip; an antenna electrically connected to the RFID chip and configured to receive signals from and transmit signals to the RFID reader; and a resonant sensing circuit comprising a resonant circuit having a resonant frequency electrically connected to the RFID chip and whose resonant frequency is affected by an environmental characteristic of interest to correspondingly generate a variable resonant frequency indicative of said environmental characteristic of interest; wherein the RFID chip is configured to modulate a signal received by the antenna from said reader by reducing the frequency thereof and drive the resonant sensing circuit using the modulated signal to obtain sensing circuit output from said variable resonant frequency to provide a response back to the RFID reader, and the antenna is configured to have an impedance which remains substantially uniform during use of the sensor system.