In practice, people generally use load reflection modulation technology for data transmission from radio frequency tags to readers to load radio frequency tag data onto reflected echoes (especially for passive radio frequency tag systems).
The time sequence method is the opposite. The electromagnetic field radiated by the reader is periodically disconnected for a short time. These intervals are identified by the radio frequency tag and used for data transmission from the radio frequency tag to the reader. In fact, this is a typical way of radar work. The disadvantage of the sequential method is that the energy supply of the radio frequency tag is interrupted during the intermittent transmission of the reader, which must be compensated by installing a sufficiently large auxiliary capacitor or auxiliary battery.