METHOD AND CIRCUIT INTENDED FOR HIGH-FREQUENCY COMMUNICATION BETWEEN AN INTERROGATOR AND A SMART TAG

摘要

A smart tag observes a first amplitude (Ai) being an amplitude of a voltage induced in a tag's antenna by an interrogator's carrier signal and transmits responding signals in that it excites its antenna with a voltage, whose amplitude as a second amplitude (At) is set with respect to said first amplitude (Ai), observed so far, in a way that the second amplitude (At) is inversely proportional to the first amplitude (Ai). The advantageous setting of the amplitude of the tag's responding signals eliminates a too strong electromagnetic emission and saves battery's energy.