Radio frequency identification method and apparatus

A radio frequency identification system, comprising an excitation device and an electronic tag, wherein

• the excitation device is configured to:
• transmit, to the electronic tag via a first frequency band, an energy signal to provide excitation energy for charging the electronic tag;
• and
• transmit a first control signal to the electronic tag via a second frequency band different from the first frequency band;
• the electronic tag is configured to:
• receive the energy signal via the first frequency band;
• receive, from the first control signal and a second control and based on a receiving frequency band of the electronic tag, a control signal via the second frequency band, wherein the second control signal is transmitted by a second excitation device via a third frequency band different from the second frequency band, and the control signal is in a same frequency band as the receiving frequency band;
• demodulate the control signal from the second frequency band;
• modulate, based on the first control signal, description information describing a product to a reflected signal such that the reflect signal is modulated with the description information and has a same frequency band as the first frequency band;
• and
• transmit, to a receiver, the reflected signal modulated with the description information and having the same frequency band as the first frequency band.