Shielded contactless electronic document
A document which includes a cover, one or more internal pages, a radiofrequency microcontroller, an antenna electrically connected to the radiofrequency microcontroller, an electromagnetic shield capable of partially disrupting wireless communication with the radiofrequency microcontroller when the document is closed, and not disrupting the wireless communication when the document is opened is described. The electromagnetic shield included in the document is implemented using metal, conductive plastic, conductive ink or magnetic ink.
1. A document comprising:
a cover having a first cover part and a second cover part, wherein the first cover part comprises at least one selected from a group consisting of paper and paperboard;
at least one internal page mounted between the two cover parts of the cover when the document is closed;
a radiofrequency microcontroller;
an antenna electrically connected to said microcontroller;
an electromagnetic shield capable of disrupting, at least partially, the wireless communication with said microcontroller when the document is closed and not disrupting the wireless communication when the document is opened,
wherein the electromagnetic shield is a wire grid implemented as a printing or other application of magnetic or conductive ink,
wherein a wire mesh distance between each two adjacent wires of the wire grid is smaller than a radio-frequency wavelength used for communicating with the radiofrequency microcontroller, and
wherein the wire mesh distance is at least 0.1 millimeters and at most 40 millimeters.
2. The document of claim 1 , wherein the electromagnetic shield is incorporated into one of the cover parts.
3. The document of claim 2 , wherein the antenna is incorporated to the other one of the cover parts.
4. The document of claim 1 , wherein the electromagnetic shield is implemented on one of the internal pages.
5. The document of claim 1 , wherein the conductance of the electromagnetic shield is greater than the conductance of the antenna.
6. The document of claim 1 , wherein said document is an identification document.
7. The document of claim 6 , wherein the identification document is a passport.