Patent ID: 8774157

Claim:
A method intended for high-frequency communication between an interrogator and a smart tag, a circuit of said smart tag being galvanically coupled with a voltage source and, according to which method the smart tag observes a first phase (Φi), which is a phase of a voltage induced in a tag's antenna by a high-frequency carrier signal generated by the interrogator, characterized in that the smart tag observes the first phase (Φi) in those time intervals located even within a data frame being transmitted, in which time intervals, according to a communication protocol, the smart tag does not transmit packets of high-frequency radio waves, and that the smart tag transmits said high-frequency wave packets, in that it excites its own antenna with a voltage, the phase of which voltage, being a second phase (Φt), is set, at the beginning of transmitting each said high-frequency wave packet, each time shifted with respect to said observed first phase (Φi) by the same phase angle (ΔΦ) being determined by a relation ΔΦ=Φt−Φi.