Browse Prior Art Database

Anti-Counterfeiting of money or government bonds Disclosure Number: IPCOM000218937D
Publication Date: 2012-Jun-12
Document File: 3 page(s) / 27K

Publishing Venue

The Prior Art Database


This disclosure describes how the emerging new technologies to print electronic circuits on flexible surfaces like plastic film, paper, or even textile can be exploited to protect documents against counterfeiting and at the same time make them accessible to radio frequence identification devices for detection, identification and tracking.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 40% of the total text.

Page 01 of 3

Anti-Counterfeiting of money or government bonds

State of the art

The advances in printed circuit technology enable low-cost manufacturing of a variety of electronic devices, including RFID tags. Companies such as Kovio and PolyIC are preparing the basic manufacturing technologies for not necessarily small, but extremely cheap electronic devices from mass production. Commercial printing processes can be used to produce RFID tags at extremely low cost. Exploiting these technology, electronic circuits can be printed just like a continuous feed document without the need for extensive clean room facilities as required for current chip manufacturing today. The resulting circuits may typically do not deliver the same performance as silicon based circuits today, but for some applications a fraction of that performance is more than sufficient.

It is possible today to print standard CMOS transistors using for example different ferro-electric polymer inks. State of the art is provided by Kovio, which introduced a thin-film transistor (TFT) printed with silicon ink on a flexible, stainless steel foil substrate. Another company, PolyIC demonstrated its PolyID tags with printed circuits that use mostly organic materials. These HF capable tags comprise roll-to-roll printed transponder chips, based on the polymer semiconductor polythiophene, printed on flexible polyester film. Achievable communication ranges today go from a few centimeters for PolyIC tags and about half a meter (1.6 feet) for Kovio. While differing in performance and manufacturing, they share the two key advantages of this technology: the resulting circuits are physically flexible, and are very cheap to produce in large quantities.

With regard to power supply, processing speed and applicability to RFID communication, the current generation of RFID circuits became less demanding compared to the first generation RFID devices. There is little power that needs to be supplied to the (usually battery-less) RFIF circuit to work. It can be drawn from the electrical field that is used to communicate between the RFID circuit and the reader device. In modern designs rather than actively sending a signal, which requires a comparably large amount of energy, the RFID circuit uses the power received via the electric field to influence that field in turn in order to transmit an answer to the reading device. The reading device actively controls that field and is capable of sensing changes to the field that are induced by the RFID within the field.

Note that in this application the actual size of the resulting electronic circuit is not a critical factor. The only requirements are that the circuit has to fit onto the real estate defined by the document that it is embedded into, and must not interfere with other features of that document, like any human readable or security features embedded into the fabric of a money bill for example.

Description of the new application

The idea of this disclosure...