Patent ID: 11889004
Assignee: FRAUNHOFER GESELLSCHAFT ZUR FÖRDERUNG DER ANGEWANDTEN FORSCHUNG E.V.
Field: Semiconductors (Electrical engineering)
Classification: CPC H  G | IPC G  H

Claim 13:
14. A physically uncloneable function, PUF, film comprising a layer stack, the layer stack comprising: a film substrate, a printed dielectric layer comprising a varying layer thickness in the dielectric layer and a structured electrode layer being arranged at the dielectric layer, wherein the structured electrode layer is influenced with respect to an electric measurement value due to the variable thickness;
wherein the structured electrode layer is a first structured electrode layer, wherein the film substrate comprises a second structured electrode layer comprising a plurality of second conductive traces, wherein the a dielectric material of the dielectric material is printed onto the second structured electrode layer, wherein the first structured electrode layer is arranged such that the first structured electrode layer comprises a plurality of first conductive traces overlapping with the second conductive traces in a plurality of overlapping regions so as to form capacitive elements in the overlapping regions; and
wherein the first structured electrode layer is arranged such that at least one of the first conductive traces overlaps with at least two second conductive traces; or such that at least one of the second conductive traces overlaps with at least two first conductive traces.