Swept Frequency Magnetically Coupled Resonant Tags for Realtime

Swept-Frequency, Magnetically-Coupled Resonant Tags for Realtime, Continuous, Multiparameter Control Joseph Paradiso and Kai-Yuh Hsiao MIT Media Laboratory 20 Ames St ...

http://www.media.mit.edu/resenv/pubs/papers/99_05_CHI99_Tags.pdf