Present Tag Technologies

Around the World

ID Tags:

• RFID tags with printed antennas -- $0.25
• early attempts to print RFID logic (e.g. by Phillips)
• commercial material tags still only 1-bit
• some success making multi-bit material ID tags (e.g. RF-Code, Flying Nulls, Holo-tag, Inkode, etc)
• much active research in multi-bit material structures

MIT Media Lab Work

ID Tags:

• Time domain domain-wall propagation
• Modelling: single-step M-H loop
• Modelling: single-step M-H loop with bias field
• Modelling: multiple-step M-H loop in time-domain
• Modelling: multiple-step M-H loop in frequency domain
• Early data

Multi-resonant LC tags

Sensor Tags ("disposable wireless sensors"):

• pressure sensor US PATENT# 6,025,725
• humidity sensor US PATENT# 6,025,725
• temperature sensor US PATENT# 6,208,253 B1