A RFID system, comprising: - a chipless RFID tag comprising: - a dielectric substrate; - electromagnetic resonators excitable by an external electromagnetic field and respectively arranged on separate spatial locations of said dielectric substrate, wherein said electromagnetic resonators are arranged on said dielectric substrate forming at least one row, and are configured to resonate at a common resonant frequency, and wherein said dielectric substrate defines several predetermined encoding areas that include at least said separate spatial locations, so that data is encoded by the presence/absence of operative electromagnetic resonators on each of said predetermined encoding areas; and - a RFID reader comprising: - a dielectric support relatively movable with respect to the dielectric substrate of said chipless RFID tag; - at least one element for at least propagating an electromagnetic wave providing said external electromagnetic field to the electromagnetic resonators, said at least one element being arranged on said dielectric support to move therewith during said relative movement to adjacent locations to said predetermined encoding areas, such that said at least one element is loaded with the electromagnetic resonators of the predetermined encoding areas; and - detection means configured and arranged for detecting the presence/absence of attenuation peaks on said electromagnetic wave, or on an electrical signal associated thereto, induced by the electromagnetic resonators, and also configured for providing, based on said detections, the data encoded in the chipless RFID tag, in the form of a code having at least one bit per predetermined encoding area, and at least two possible alternate logic states per bit determined by the presence/absence of a respective one of said attenuation peaks. - a chipless RFID tag comprising: - a dielectric substrate; - electromagnetic resonators excitable by an external electromagnetic field and respectively arranged on separate spatial locations of said dielectric substrate, wherein said electromagnetic resonators are arranged on said dielectric substrate forming at least one row, and are configured to resonate at a common resonant frequency, and wherein said dielectric substrate defines several predetermined encoding areas that include at least said separate spatial locations, so that data is encoded by the presence/absence of operative electromagnetic resonators on each of said predetermined encoding areas; and - a dielectric substrate; - electromagnetic resonators excitable by an external electromagnetic field and respectively arranged on separate spatial locations of said dielectric substrate, wherein said electromagnetic resonators are arranged on said dielectric substrate forming at least one row, and are configured to resonate at a common resonant frequency, and wherein said dielectric substrate defines several predetermined encoding areas that include at least said separate spatial locations, so that data is encoded by the presence/absence of operative electromagnetic resonators on each of said predetermined encoding areas; and - a RFID reader comprising: - a dielectric support relatively movable with respect to the dielectric substrate of said chipless RFID tag; - at least one element for at least propagating an electromagnetic wave providing said external electromagnetic field to the electromagnetic resonators, said at least one element being arranged on said dielectric support to move therewith during said relative movement to adjacent locations to said predetermined encoding areas, such that said at least one element is loaded with the electromagnetic resonators of the predetermined encoding areas; and - detection means configured and arranged for detecting the presence/absence of attenuation peaks on said electromagnetic wave, or on an electrical signal associated thereto, induced by the electromagnetic resonators, and also configured for providing, based on said detections, the data encoded in the chipless RFID tag, in the form of a code having at least one bit per predetermined encoding area, and at least two possible alternate logic states per bit determined by the presence/absence of a respective one of said attenuation peaks. - a dielectric support relatively movable with respect to the dielectric substrate of said chipless RFID tag; - at least one element for at least propagating an electromagnetic wave providing said external electromagnetic field to the electromagnetic resonators, said at least one element being arranged on said dielectric support to move therewith during said relative movement to adjacent locations to said predetermined encoding areas, such that said at least one element is loaded with the electromagnetic resonators of the predetermined encoding areas; and - detection means configured and arranged for detecting the presence/absence of attenuation peaks on said electromagnetic wave, or on an electrical signal associated thereto, induced by the electromagnetic resonators, and also configured for providing, based on said detections, the data encoded in the chipless RFID tag, in the form of a code having at least one bit per predetermined encoding area, and at least two possible alternate logic states per bit determined by the presence/absence of a respective one of said attenuation peaks.