Towards a wireless chip less smart current sensor system based on giant magnetoresistance

Passive and remote current sensing technology has many potential applications in monitoring the real-time power usage in electric power distribution infrastructure. We present, the implementation and development of a stable highly sensitive, chip-less, wireless and battery free current sensor. The developed current sensor is consisting of mender structured Giant magnetoresistance (GMR) magnetic sensor for current sensing, one-port surface acoustic wave (SAW) reflective delay line as transponder to replace existing complex wireless transceiver system composed of thosunds of electronic components, two antennas, and a network analyser for measurement unit. Good linearity and sensitivity were observed at the amplitude variations in terms of current and sensor exhibits a sensitivity of 0.57 bB/A with a current sensing range 0 to 15 A. Coupling of Mode (COM) modelling simulations were also performed to predict device performance.