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This paper presents a flexible inductive coil tag for sensing the electric current in the two-wire power cords of household goods. The tag is fabricated using a complementary metal-oxide semiconductor compatible SU-8 flexible technology which provides unique device characteristics of low-cost, reliability and pervasiveness. With a 30-turns coil design in an area of 0.5 × 1 cm2, the coil tag can provide sensitivity of 18 and 21 μV/A for detecting 50-and 60-Hz electric current in the ampere regime, respectively.
Date of Publication: June 2012