In fact, RFID technology was first widely applied and promoted in low frequencies (from 125kHz to 134kHz). This frequency is mainly operated through inductive coupling, which means there is transformer coupling between the reader coil and the inductor coil. The voltage induced in the inductor antenna through the alternating field of the reader is rectified and can be used as a power supply voltage. The magnetic field region can be well defined, but the field strength decreases too quickly.

The general operating frequency of sensors operating at low frequencies ranges from 120kHz to 134kHz, while the operating frequency of TI is 134.2kHz. The wavelength of this frequency band is approximately 2500m;
1. In addition to the influence of metal materials, low frequencies can generally pass through objects of any material without reducing their reading distance.
2. There are no special licensing restrictions for low-frequency readers worldwide.
3. Low frequency products come in different packaging forms. A good packaging form is too expensive, but it has a lifespan of over 10 years.

5. Compared to RFID products in other frequency bands, the data transmission rate in this frequency band is relatively slow.


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At high frequencies (operating at 13.56MHz), the inductor no longer requires coils to be wound, and antennas can be made through corrosion or printing. Sensors generally operate through load modulation. That is, by turning on and off the load resistance on the inductor, the voltage on the reader/writer antenna is changed, achieving amplitude modulation of the antenna voltage using a remote inductor. If people control the on and off of load voltage through data, then this data can be transmitted from sensors to readers and writers.

1. The working frequency is 13.56MHz, and the wavelength of this frequency is approximately 22m;
2. Except for metal materials, the wavelength of this frequency can pass through most materials, but it often reduces the reading distance. The sensor needs to be away from the metal for a certain distance;
3. This frequency band is recognized globally without special restrictions;
4. Sensors are generally in the form of electronic tags;

6. The system has anti-collision characteristics and can read multiple electronic labels simultaneously;
7. It is possible to write certain data information into labels;
8. The data transmission rate is faster than low-frequency, and the price is not very expensive.