Extended range RF-ID transponder

Details Extended range RF-ID transponder Extended range RF-ID transponder

1992-03-26

1993-12-14

Tubbesing, T. H.

Communications: directive radio wave systems and devices (e.g.,

Transmission through media other than air or free space

342 42, G01S 1374

Patent

active

052707172

ABSTRACT:
An extended range transponder/antenna configuration comprises a standard, state-of-the-art transponder which is coupled to a long and narrow antenna by a loosely coupled coil. The coupling of the coil to the transponder must be loose for a tuned type transponder in order to maintain the high "Q" and to avoid detuning and damping. Both effects of lowering the "Q" and detuning or damping the transponder would have an adverse effect on the receiving function of the transponder and the reading range of the transponder. The RF-ID efficiency of the arrangement is generally optimized for this type of application by the long but narrow antenna solution and by the simple fact that coupling an antenna to a transponder, amplifies the emission of the transponders signal relative to the noise, thus improving the signal-to-noise ratio of the RF-ID system. The fact that the width of the transponder loop antenna can be made very small eliminates, to a high degree, the noise impact on reading range with the result that a large reading range is maintained.

REFERENCES:
patent: 4737789 (1988-04-01), Nysen
patent: 5057844 (1991-10-01), Rothstein

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