Transponder for an automatic vehicle identification system

Details Transponder for an automatic vehicle identification system Transponder for an automatic vehicle identification system

1974-11-15

1976-06-15

Yusko, Donald J.

Communications: electrical

Digital comparator systems

343 68LC, 340 38L, H04Q 900, G01S 956

Patent

active

039640248

ABSTRACT:
This disclosure relates to an inductively powered type of electronic transponder for identifying a moving object passing an interrogation area. The transponder includes a tuned inductive-capacitive pick-up circuit for receiving interrogating signals. The picked up interrogating signals are rectified to produce d.c. operating power and are applied to a frequency divider for producing a frequency related transmission signal and clock data rate pulse. A latching circuit enables a shift register so that the clock pulses serially shift out binary encoded data from the shift register. The encoded data is fed to a logic network which is coupled to a balanced switching amplifier for phase modulating the transmission signal for propagation into the interrogation area.

REFERENCES:
patent: 3290675 (1966-12-01), Neild
patent: 3512154 (1970-05-01), Farrar
patent: 3855592 (1974-12-01), Davis et al.
patent: 3859624 (1975-01-01), Kriofsky et al.

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