Importance

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Abstract

A movable-object identification system includes an interrogator for transmitting an interrogation signal, and a responder mounted on a movable object for transmitting a reply signal in response to the interrogation signal. The reply signal contains identification information. The responder includes an antenna for receiving the interrogation signal from the interrogator and for radiating the reply signal; and an input device connected to the antenna for receiving an electric power of the interrogation signal received by the antenna. The input device includes a receiving element for dividing the received electric power into a first separation electric power and a second separation electric power corresponding to a traveling and reflected wave of the interrogation signal, respectively. The receiving element has an impedance. The responder further includes a generating device for generating predetermined identification information using the first separation electric power; and a modulating device, connected in parallel with the input device and connected to the antenna, for varying the impedance of the receiving element in accordance with the generated identification information, for modulating the second separation electric power of the interrogation signal in accordance with the identification information to generate the reply signal, and for feeding the reply signal to the antenna.

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First Claim