METHOD AND APPARATUS FOR PROVIDING ENERGY TO PASSIVE TAGS IN A RADIO -FREQUENCY IDENTIFICATION SYSTEM

摘要

The present invention provides a method and an apparatus for providing energy to passive tags (4) in a radio-frequency identification system (1). In a radio-frequency identifycation system (1) using the passive tags (4), a reader/writer (2) will send commands and continuous waves (10) alternately during a communication process, and the tags (4) can obtain energy from these signals sent by said reader/writer (2). The method of the present invention is that, at least one period is selected from those periods for transmitting the continuous waves (10), and for the continuous wave (10) transmitting signals during this period, an enhanced transmitting power is used, or a extended transmitting time is used, or during this period continuous waves (10) are sent additionally to the tags (4) by an independent energy supplying apparatus (24) provided separately, so that the tags (4) can obtain from the continuous waves (10) during said selected period more energy for reading and/or writing, thereby improving the reliability of the reading and/or writing operations, and increasing the rewritable range of the radio-frequency identification system (1).