Patent ID: 8493181

Claim:
A sensor tag, comprising: a transmission/reception antenna, a power receiving circuit, and a microprocessor, wherein the power receiving circuit enabling bi-directional communication is combined with a stab resonance boost circuit and a ladder boost rectification circuit, the ladder boost rectification circuit comprises an input connected to an antenna power feed point for receiving a single phase input signal, the ladder boost rectification circuit boosting and rectifying the single phase input signal, the ladder boost rectification circuit further comprising a Cockcroft-Walton circuit formed of a plurality of diodes, a plurality of ground-side capacitors, and a plurality of power-receiving-side capacitors, where a first diode on an input side being removed and a capacitance value of each power-receiving-side capacitor being smaller than a capacitance value of each ground-side capacitor, with the stab resonance boost circuit being used for the removed first diode on the input side at the input connected to the antenna power feed point.