Transponders & Interrogators

Transponder/Interrogator systems operate by sending radio frequency signals between an interrogator/antenna and transponders which are attached to objects or in particular locations. One example of a transponder/interrogator system uses the interrogator antenna to send an unmodulated radio frequency signal in the direction of the transponder. The transponder is initialized by this signal, slightly modifies it, and reflects a modulated signal back to the antenna. The interrogator receives this signal, processes it to determine the identity of the object or the position to which the transponder is attached, and provides a serial output interface to the outside world.

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