Dual frequency identification system

Details Dual frequency identification system Dual frequency identification system

1984-11-29

1987-03-03

Tubbesing, T. H.

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

Radar transponder system

Unique identity

G01S 1380

Patent

active

046479317

ABSTRACT:
An identification system comprising one or more tags and an interrogator. A tag is responsive to a radio frequency signal transmitted from the interrogator for phase modulating the signal alternately with a first frequency and a second frequency depending on a preselected code and for re-radiating the phase modulated signal back to the interrogator.

REFERENCES:
patent: 2461456 (1949-02-01), Usselman
patent: 2644036 (1953-06-01), Jones
patent: 3223925 (1965-12-01), Florac, Jr. et al.
patent: 3984835 (1976-10-01), Kaplan et al.
R. Graf, Dictionary of Electronics; (1974), pp. 467-468.

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