依据射频标签工作频率的分类（Classification of radio frequency labels based on frequency）.doc

依据射频标签工作频率的分类（Classification of radio frequency labels based on frequency） From the concept of application, the working frequency of RFID tags, that is, the frequency of radio frequency identification system, is one of the most important characteristics. There is no doubt that the frequency of RFID tags is one of its most important features. The working frequency of the RF tag not only determines the working principle of radio frequency identification system (or inductively coupled electromagnetic coupling), recognition distance, but also determines the RFID reader and the complexity and the cost of equipment. RFID tags operating in different frequency bands or frequency points have different characteristics. Radio frequency identification applications occupy the frequency band or frequency point, internationally recognized division, that is located in the ISM band. Typical operating frequencies are: 125kHz, 133kHz, 13.56MHz, 27.12MHz, 433MHz, 902~928MHz, 2.45GHz, 5.8GHz, etc.. From the concept of application, the working frequency of RFID tag is the working frequency of RFID system. 1. low frequency RFID tag Low frequency radio frequency tags, referred to as low-frequency tags, whose operating frequency range of 30kHz ~ 300kHz. Typical operating frequencies are: 125KHz, 133KHz. Low frequency tags are generally passive tags, and their work energy is obtained from the radiation near field of the reader coupling coil by inductively coupled mode. When transmitting data between a low frequency tag and a reader, the low frequency tag is located in the near-field region of the radiation of the reader antenna. The reading distance of low frequency tags is generally less than 1 meters. Typical applications of low frequency tags are: animal identification, container identification, tool identification, electronic locking, anti-theft (car keys with built-in transponder), etc.. International standards relating to low frequency tags are: ISO11784/11785 (for animal identificatio