Fecha de publicación: -- Fuente: WIPO "tomato" An electric field sensor device includes: an antenna device that has a dipole structure that receives an electric field, the antenna device including a first antenna element connected to or in contact with a ground and a conductor existing with a certain resistance value, and a second antenna element grounded to an earth ground or not grounded to an earth ground; a rectifier circuit that rectifies a signal induced in the antenna device; and a detection unit that detects a level of an output voltage of the rectifier circuit. The detection unit detects a change in level of the output voltage caused when the first antenna element or the second antenna element not grounded to an earth ground is spatially coupled to or in contact with another conductor different from the conductor, and detects a state or a situation of the other conductor.