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Multitag transponder systems

 

Fraunhofer-Institut für Mikroelektronische Schaltungen und Systeme -IMS-, Dresden; Fraunhofer-Institut für Mikroelektronische Schaltungen und Systeme -IMS-, Duisburg; Fraunhofer-Institut für Mikroelektronische Schaltungen und Systeme -IMS-, München:
Fraunhofer-Institut für Mikroelektronische Schaltungen und Systeme. Annual Report 2000
Duisburg: IMS, 2001
ISSN: 1435-0874
S.64-67 : Ill., Lit.
Englisch
Aufsatz in Buch
Fraunhofer IMS ()

Abstract
In the past one of the main problems of multitag passive transponders was the stack problem. The transponders became detuned if arranged in a stack. Hence they could not receive enough power delivered by the interrogator.
In this communication we have shown how to solve the problem by empolying network theory. The behaviour of the transponders is determined by the mesh impedance matrix Z(M) of the transponder network. Hence the coil currents of the transponders reach no maximum at the frequency of the power transmitter if they get too close to another.
Note that the solution proposed in this communication requires no modification of the existing passive transponders only of the interrogator. An external tuning device has to be added.
Simulation results and measurements have confirmed that it works.
In theory stacks of passive inductive transponders can now be powered at a fixed frequency within an ISM band. Simulations and measurements have verified that an additional maximum can be generated by an external tuning device and its frequency can be controlled by tuning the device. A demonstrator for an interrogator for transponder stacks is now under development.

: http://publica.fraunhofer.de/dokumente/N-9686.html