Management systems for animal husbandry, automotive anti-theft and keyless entry system applications, marathon running system applications, automatic parking lot fees and vehicle management systems, automatic fueling system applications, hotel door lock system applications, access control and security management systems, intelligent logistics management systems.
Radio Frequency (RF) is an abbreviation for Radio Frequency, which indicates the electromagnetic frequency that can be radiated into space, with a frequency range from 300KHz to 300GHz. Radio Frequency is abbreviated as RF Radio Frequency is radio frequency current, which is an abbreviation for high-frequency alternating changing electromagnetic waves.
Changes less than 1,000 times per second of the alternating current is called low-frequency current, greater than 10,000 times called high-frequency current, and radio frequency is such a high-frequency current. High frequency (greater than 10K); radio frequency (300K-300G) is the higher frequency band of high frequency; microwave band (300M-300G) is again the higher frequency band of radio frequency.
Expanded Information:
Working Principle
The basic workflow of the system is: the reader sends out a certain frequency of RF signals through the transmitting antenna, and when the RF card enters into the transmitting antenna's working area it generates an induced current, and the card gets activated with the energy; the card will send out its own coding and other information through the card's built-in sending The RF card will send out the information such as its own code through the card's built-in transmitting antenna.
System receiving antenna receives the carrier signal sent from the RF card, transmitted to the reader through the antenna regulator, the reader demodulates and decodes the received signal and then sends it to the background main system for relevant processing; the main system determines the legitimacy of the card according to the logic operation, and makes the corresponding processing and control for the different settings, and sends out the command signal to control the actuator action.
Radio frequency identification system read-write distance is a very key parameter. At present, the price of long-distance radio frequency identification system is still very expensive, so it is important to find ways to improve its read-write distance.
Factors affecting the RF card read-write distance include the antenna operating frequency, the reader's RF output power, the reader's receiving sensitivity, the power consumption of the RF card, the antenna and the resonant circuit Q value, antenna direction, the reader and the RF card coupling degree, as well as the RF card itself to obtain the energy and the energy of the information sent, etc.. Most of the system read distance and write distance is different, write distance is about 40% to 80% of the read distance.
Reference Sources:
Baidu Encyclopedia-Radio Frequency
China Knowledge Networks-Applications of RF Technology