Transponder for vehicle identification device

Details Transponder for vehicle identification device Transponder for vehicle identification device

1993-06-04

1994-05-10

Sotomayor, John B.

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

Radar transponder system

Radar transponder only

342 44, G01S 1380

Patent

active

053111869

ABSTRACT:
The invention relates to a transponder for a vehicle identification device in which a radio wave including vehicle information returned from transponders provided in a vehicle is received by an interrogator. The vehicle transponder receives a query radio wave and uses a detection device to generate a previously memorized coded signal train in response to a received wave. The coded signal train varies an amount of bias voltage of the detection device so that a reflection coefficient of the detection device is varied to modulate the reflection wave of the query radio wave and the modulated wave is transmitted back to the interrogator.

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