NOVELTY - The structure (1) comprises two fibrous layers (2a, 2b) e.g. a tracing paper, a monolayer sub-structure (3) having a translucent region, a watermark or pseudo-watermark contained in each fibrous layer and partially overlapped in the translucent region, microchip devices (4) integrated with wireless communication with or without contact, and an antenna (5) coiled, etched, screen printed, associated or adhered with microchip devices. The watermark or pseudo-watermark forms a pattern outside the sub-structure, and is not observable in light, which is transmitted through the structure.    USE - Used as a structure such as an identity document including identity card or passport, a payment unit including credit card, a purchase voucher or a ticket access to cultural events or sports, a loyalty card, and an authenticity certificate.    ADVANTAGE - The structure has improved esthetic effect, ensures easy revelation of hidden information of a security document or article thus protecting the documents against forgery and providing a sufficient level of security, and can be efficiently and economically manufactured.    DETAILED DESCRIPTION - The structure (1) comprises two fibrous layers (2a, 2b) e.g. a tracing paper, a monolayer sub-structure (3) having a translucent region, a watermark or pseudo-watermark contained in each fibrous layer and partially overlapped in the translucent region, microchip devices (4) integrated with wireless communication with or without contact, and an antenna (5) coiled, etched, screen printed, associated or adhered with microchip devices. The watermark or pseudo-watermark forms a pattern outside the sub-structure, and is not observable in light, which is transmitted through the structure at a level of the translucent region in a side adjacent to the fibrous layer. The sub-structure is located between the fibrous layers. The sub-structure diffuses the light, has a thickness of 400-600 mu m, is made of an assembly of fibrous and/or polymer layers, and comprises inorganic/organic fillers, bubbles or cavitation, which confers a diffusing character. The fibrous layers: comprise cellulose fibers, synthetic fibers and/or natural organic fibers other than cellulose and/or mineral fibers; are printable by a technique of offset-, gravure-, flexographic-, screen-, intaglio-, typography-, laser- or inkjet printing; have a base weight of 60-120 g/m2; and comprise two recesses. The recesses are placed next to one another to form a window. The microchip devices include an electroluminescent device such as LED or organic light emitting device, a display device e.g. a screen, a sensor, a coupling antenna and an interrupter. The microchip device is supplied with electricity using an external battery or fuel cell present on the integrated microcircuit. The antenna is situated between the two fibrous layers. An adhesive layer is present between one fibrous layer and sub-structure. Two outer transparent layers are present to cover respective fibrous layers on sides opposite to the sub-structure, and join at edges of the structure. A spacer layer, which is transparent, translucent or opaque, is placed between the outer layers, and has a thickness that compensates the total thickness of the fibrous layers and the sub-structure. The fibrous layers have a width of less than the substructures, and greater than the outer layers. The sub-structure, fibrous layers, outer layers, adhesive layers and/or spacer layer comprise visible or invisible security features. The substructure comprises an ultraviolet absorber. The structure has a constant or variable thickness elevated along its central part of the edges.    DESCRIPTION OF DRAWING(S) - The figure shows a sectional view of a structure.    Structure (1)    Fibrous layers (2a, 2b)    Sub-structure (3)    Integrated microchip device (4)    Antenna. (5)