PURPOSE: To provide an automatic identification device which can identify at a long distance without integrating a specific power source into a responder.
CONSTITUTION: A modulated interrogation microwave signal 3 is received by a responder 2 through an antenna 35. The responder 2 has a storing means 36. The storing means stores power transmitted by the interrogation microwave signal 3 at every period of the modulated signal. When the stored power, for example, reaches a level necessary for providing power source voltage for operating semiconductors of an encoded means 37 and a transmitting means 38, these means immediately encode a response micro wave signal 4 of the responder 2 and transmit the encoded signal to an interrogator 1 by a transmitting antenna 39. The receiving antenna 35 of the responder 2 is used as the transmitting antenna 39 as well. The responder 2 acts like an adjusting means to adjust the power source voltage of the semiconductors within a determined area.
IBU KANARU
JIYAN SHIYUNUYU
