SYSTEM FOR CONTROLLING AUTHENTICITY OF DETECTED PRODUCT WITH RESONANCE PROTECTIVE MEANS Russian patent published in 2007 - IPC G07D7/10 G06K5/04 

FIELD: technology for protection from forgery, of, for example, bank notes, credit documents and other securities, and also for providing operative high speed control of their authenticity with high degree of trustworthiness.

SUBSTANCE: system for controlling authenticity of detected product is used for detection and identification of passive protective means with resonance filter structure, including planar strip line. System includes source of probing radiation and receiver of resonance response radiation, connected serially to three identical micro-strip slit antennas. Each antenna includes conductive screen with slit diaphragm. Source contains one antenna, while receiver - two, positioned with relative shift in one plane and one of which is positioned with air gap relatively to antenna of source (oppositely to the latter) so that slit diaphragms of this pair intersect in parallel planes at an angle close to or equal to 90°. Slit diaphragm of other antenna of receiver is directed at angle close to or equal to 45° relatively to slit diaphragms of oppositely positioned antennas. Value of aforementioned relatively shift of antennas of radiation receiver is close to or equal to length of planar strip line of passive protection means. Planar strip line during control of authenticity of detected product is positioned in gap between aforementioned oppositely positioned antennas at an angle close to or equal to 45° relatively to slit diaphragm of oppositely positioned antennas, respectively, of source and receiver with possible translational displacement through zone of intersection of these slit diaphragms and central area of slit diaphragm of another antenna of radiation receiver.

EFFECT: higher efficiency.

3 cl, 7 dwg