A data carrier in which an electronic module comprising an integrated circuit and a coil electrically connected with the circuit is disposed in a channel in the data carrier. To permit simple manufacture of the data carrier, at least one opening for forming the channel is provided in at least one card...http://www.google.com.au/patents/US5962840?utm_source=gb-gplus-sharePatent US5962840 - Data carrier with electronic module and embedded coil feature
