RFID technology to find broad markets.

Scientists at Mid-Sweden University have initiated a research project focusing on printed electronics and radio frequency identification (RFID) technology. With the help of radio waves, many items can be identified at the same time, which is of great value in taking inventory, for example. Eventually, RFID will replace bar codes on packaging.

Unlike bar codes, RFID uses radio frequencies, which make it possible to track and identify many products. An RFID tag can be attached to or incorporated into a product, animal, or person for the purpose of identification using radio waves. Some tags can be read from several meters away and beyond the line of sight of the reader.

Most RFID tags contain an integrated circuit for storing and processing information, modulating and demodulating a (RF) signal. The tag also has an antenna for receiving and transmitting the signal. A technology called chipless RFID allows for discrete identification of tags without an integrated circuit, thereby allowing tags to be printed directly onto assets at lower cost than traditional tags.

RFID constitutes the base of a worldwide identification system called Electronic Product Code Network (EPC Network). Fully deployed, the system will function like an Internet search engine, not to find home pages but rather products and objects marked with RFID technology.

Even today, products can tell us their identity. However, with the aid of new technology, like printed sensors, packaging can provide much more information, such as how an item was handled during transport, whether the packaging has been opened and when the product may have been exposed to damaging temperatures or moisture.

The scientists at Mid-Sweden University are also working on moisture sensors both for packaging and for mold control in buildings. They are developing a printed sensor able to operate well in dry conditions--15% to 40% humidity. In addition, scientists at the university have sensors that can function above 50% humidity. The sensors could be integrated into printed RFID technology, both passive and semi-active RFID products. The goal is to develop technology that could be produced using a roll-to-roll paradigm. In this effort, researchers also include efficient printed antennas.

Further information. Hans-Erik Nilsson, Head, Department of Information Technology and Media, Mid-Sweden University, 851 70 Sundsvall, Sweden; phone: [phone]; cell phone: [phone]; email: [e-mail]; URL: www.miun.se/itm.