US Patent 10511100 Inkjet printed flexible Van Atta array sensor

A radio-frequency responsive device includes a dielectric substrate having a first side and an opposite second side. A Van Atta array reflector is printed on the first side of the dielectric substrate. The Van Atta array reflector reflects an incident signal at a predetermined radio frequency at an incident angle. A conductive ground layer is disposed adjacent the second side of the dielectric substrate. In a method of making a radio-frequency responsive device, a Van Atta array reflector is printed on a first side of a dielectric substrate. A conductive ground layer is applied to a second side of the dielectric substrate, in which the second side is opposite the first side.