依据射频标签技术特征的分类（According to the classification of radio frequency label technology）.docVIP

依据射频标签技术特征的分类（According to the classification of radio frequency label technology） This paper briefly introduces the classification of radio frequency label technology. 1. working methods The basic modes of radio frequency identification system are divided into full duplex (Full, Duplex) and half duplex (Half Duplex) systems and time series (SEQ) systems. Full duplex means that the RF tag and reader can transmit information to each other at the same time. Half duplex indicates that the RF tag and reader can transmit information in both directions, but at the same time, information can only be transmitted in one direction. In full duplex and half duplex systems, the response of the radio frequency tag is sent out of the electromagnetic field or electromagnetic wave produced by the reader. As compared with the signal reader itself, RFID tag signal is very weak in the receiving antenna, so you must use the appropriate method for the transmission signal, the difference between signal and RF tag reader apart. In practice, load modulation technology is used to transmit RFID tag data to reflected echoes (especially for passive RFID systems). In contrast to the sequential method, the electromagnetic radiation radiated by the reader is broken off for a short period of time. These intervals are identified by radio frequency labels and are used for data transmission from the RFID tag to the reader. In fact, this is a typical way of radar operation. The disadvantage of the sequential method is that when the reader sends a pause, the energy supply of the radio frequency label is interrupted, which must be compensated by loading large enough auxiliary capacitors or auxiliary batteries. 2. data Radio frequency identification RFID tags typically range from a few bytes to several thousand bytes. However, with one exception, this is the 1 bit RFID tag. It has 1 bits of data, enough to allow readers to make the following two states of judgment: there is a radio frequency tag in the el