Line sensor comprising a capacitive divider with integrated slot antenna

A line sensor for being mounted to a power line, the line sensor comprising:

• a housing for containing line sensor electronics;
• and
• an voltage-sensing capacitor in connection with the housing, the voltage-sensing capacitor having two capacitor plates that are placed at a distance from each other for forming a first capacitance, wherein a first, upper, one of the two capacitor plates is configured to be electrically connected with the power line, and a second, lower, one of the two capacitor plates is electrically floating and forms a second, parasitic, capacitance with earth,
• the line sensor being characterized by an electric circuit being connected in parallel with the first capacitance for receiving a harvested voltage standing over the two capacitor plates, the electric circuit being configured for operating in an energy harvesting mode and/or a voltage-sensing mode,
• the line sensor being further characterized by a slot antenna being integrated in the first, upper, one of the two capacitor plates, a slot of the slot antenna having two opposing short sides and two opposing long sides, the slot antenna comprising an input terminal at a first one of the long sides of the slot and an output terminal on a second one of the long sides of the slot, wherein in the second, lower, one of the two capacitor plates an opening is provided for allowing radiofrequency waves generated by the slot antenna to be transmitted through the opening.