Methods of manufacturing security structures for security documents

A method of manufacturing a hybrid security structure for a security document, the method comprising the steps of:

• providing a document substrate;
• applying to the document substrate, by a first process, a first element comprising a first electrically conductive region of the hybrid security structure;
• applying to the document substrate, by a second process, a second element comprising a second electrically conductive region of the hybrid security structure, wherein the first process is different from the second process;
• and
• electrically coupling the first and second electrically conductive regions of the hybrid security structure using a DC or AC connecting element, so as to provide an electrical capacitance for detection by a capacitance sensor.