Microwave method for checking the authenticity

摘要

A method of checking the authenticity of a security document, said security document comprising an electrically non-conducting base material such as paper or plastic, particles functioning as an electrical dipole being incorporated in said base material and functioning as a security element. The method comprises the following steps: (a) manually performing a relative movement between a document (10) to be checked and a microwave detector; (b) emitting microwaves to said document (10) to be checked and receiving microwaves from said document to be checked in order to check whether said particles are present; (c) preventing human fingers or peoples' hands from interfering with the microwaves received from said document to be checked in order to avoid that human fingers are confused with said particles.