In the last article, we have got some basic knowledge about the technology innovation from Bar-code to Radio Frequency Identification, which is an inevitable tendency with the self development of RFID technology. In the next two articles, we will show you the self development tendency of Radio Frequency & RFID Solution applications.
RFID, mainly divided into three categories:
125Khz
13.56Mhz
860~960Mhz
- The characteristics of LF & HF systems include short reading distance and antenna’s poor reading direction and the High Frequency System has the characteristic of low communication speed. The two different frequency systems realize the energy transfer and data change according to the theory of inductive coupling based on a magnetic field, mainly utilized in the applications of short distance and low cost.
- The UHF & Microwave labels realize the data change by passive backscatter based on an electric field. The reading distance of these two frequencies is longer, which can reach up to several meters and can work well with the quickly moving items. The reading antenna and the labels’ antenna have great reading direction. However, the cost of its reader and tags is much higher.
Now the RFID applications mainly utilize the LF(125KHz), HF(13.56MHz) and UHF(860~960MHz). Among them, RFID 125KHz and RFID13.56MHz developed much earlier, have more mature technology and lower cost because of the simple technology principal. There are already many applications of these two frequencies, including ID card, youth card, transportation card, etc… In contrary, the development of the RF front-end and antenna of the UHF frequency is much more difficult because of the increase of the frequency.
Comparison of Capacity of Different Frequency:
