The hottest RFID operating frequency guide and typ

  • Detail

RFID working frequency guide and typical applications

at present, the working frequencies of RFID products are defined as different products that meet different standards within the frequency range of low frequency, high frequency and VHF, and RFID products of different frequency bands will have different characteristics. There are two ways of inductors: passive and active. This paper introduces the characteristics and main applications of passive inductors in products with different working frequencies in detail

first, low frequency (from 125kHz to 134khz)

in fact, RFID technology has been widely used and promoted in low frequency first. This frequency mainly works through inductive coupling, that is, there is transformer coupling between the reader coil and 5. Displacement measurement: the resolution is 0.01mm sensor coil The voltage induced in the sensor antenna by the alternating field of the reader/writer is rectified and can be used as the supply voltage The magnetic field region can be well defined, but the field strength decreases too fast


1 The general working frequency of the sensor working at low frequency ranges from 120kHz to 134khz, and the working frequency of Ti is 134.2khz. The wavelength of this frequency band is about 2500m

2. In addition to the influence of metal materials, low frequencies can generally pass through objects of any material without reducing its reading distance

3. There are no special license restrictions for low-frequency readers and writers in the world

4. Low frequency products have different packaging forms. A good packaging form is too expensive, but it has a service life of more than 10 years

5. Although the magnetic field area of this frequency decreases rapidly, it can produce a relatively uniform read-write area

6. Compared with RFID products of other frequency bands, the data transmission rate of this frequency band is relatively slow

7. The price of sensors is relatively expensive compared with other frequency bands

main applications:

1 Animal husbandry management system

2 Application of car anti-theft and keyless door opening system

3 Application of marathon running system

4 Automatic parking lot charging and vehicle management system

5 Application of automatic refueling system

6 Application of hotel door lock system

7 The access control and security management system

complies with international standards:

a) ISO 11784 RFID animal husbandry application - coding structure

b) ISO 11785 RFID animal husbandry application - technical theory

c) ISO RFID animal husbandry application - air interface

d) ISO RFID animal husbandry application - protocol definition

e) ISO defines the physical layer of low frequency Anti collision and communication protocol

f) DIN 30745 is mainly the European standard for the definition of waste management applications

II. High frequency (working frequency is 13.56MHz)

the sensor at this frequency no longer needs to be wound by the coil, and the antenna can be made by corrosion and printing. Sensors generally work by load modulation. That is, the voltage on the antenna of the reader/writer is changed by the connection and disconnection of the load resistance on the sensor, so as to realize the amplitude modulation of the antenna voltage with the remote sensor. If people control the on and off of load voltage through data, then these data can be transmitted from the sensor to the reader


1 The operating frequency is 13.56MHz, and the wavelength of this frequency is about 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 a distance away from the metal

3. This frequency band is recognized all over the world without special restrictions

4. Sensors are generally in the form of electronic labels

5. Although the magnetic field area of this frequency decreases rapidly, it can produce a relatively uniform read-write area

6. The system has anti-collision characteristics and can read multiple electronic labels at the same time

7. Some data information can be written into the tag

8. The data transmission rate is faster than low-frequency, and the price is not very expensive

main applications:

1 Application of library management system

2 Management and application of gas cylinders

3 Management and application of garment production line and logistics system

4 Three meter pre charging system

5 Management and application of hotel door locks

6 Large conference personnel channel system

7 Fixed assets management system

8 Management and application of pharmaceutical logistics system

9 The management of smart shelves

complies with international standards:

a) iso/iec 14443 near coupled IC card, with a maximum reading distance of 10cm

b) iso/iec 15693 loosely coupled IC card, the maximum reading distance is 1m

c) iso/iec this standard defines the physical layer, anti-collision algorithm and communication protocol of the 13.56MHz system

d) 13.56MHz ISM band class 1 definition 13.56MHz conforms to the interface definition of EPC

III. VHF (operating frequency between 860MHz and 960MHz)

VHF system transmits energy through electric field. The energy of the electric field does not decline very fast, but the read area is not well defined. The reading distance of this frequency band is relatively long, and the passive can reach about 10m. It is mainly realized by capacitive coupling


1 In this frequency band, the global definition is not very same - the frequency defined in Europe and some Asia is 868mhz, the frequency band defined in North America is between 902 and 905MHz, and the frequency band recommended in Japan is between 950 and 956. The wavelength of this frequency band is about 30cm

2. At present, the power output of this frequency band is defined uniformly (4W in the United States and 500MW in Europe). European restrictions may rise to 2W EIRP

3. VHF radio waves cannot pass through many materials, especially suspended particles such as water, dust and fog. Compared with high-frequency electronic tags, electronic tags in this frequency band do not need to be separated from metals

4. The antenna of an electronic tag is generally long and tag shaped. The antenna has two designs, linear and circular polarization, to meet the needs of different applications

5. This frequency band has a good reading distance, but it is difficult to define the reading area

6. It has a high data transmission rate and can read a large number of electronic labels in a very short time

main applications:

1 Management and application in supply chain

2 Management and application of production line automation

3 The excessive wind speed of the air bag will accelerate the heat exchange between the surface of the test piece and the active air flow in the box. The management of the air bag depends on the specific requirements of the type, performance and accuracy of the experimental machine Container management and application

5 Management and application of railway parcels

6 The logistics management system's graphene patents in China account for the vast majority of the world's patents, and the international standards that

comply with:

A) iso/iec defines the VHF physical layer and communication protocol; The air interface defines two parts: type A and type B; Read and write operations are supported

b) EPCglobal defines the structure of electronic item coding, VHF air interface and communication protocol. For example: Class 0, class 1, UHF Gen2

c) ubiquitous ID Japanese organization, which defines uid coding structure and communication management protocol

we have no doubt that VHF products will be widely used in the future. For example, Walmart, Tesco, the U.S. Department of defense and Metro supermarket will apply RFID technology in their supply chain. (end)

Copyright © 2011 JIN SHI