Tuesday, February 22, 2011

【 Weak current College 】 different working RFID frequency characteristics and typical applications Guide 】

A different band RFID products will have different characteristics of different standards, this article details the passive sensors in different frequency characteristics of the product, as well as the main application.

Currently define the operating frequency RFID products have low frequency, HF and VHF frequency range with different standards of different products and different band RFID products will have different characteristics. Which sensors are passive and active in two ways, the following details the passive sensors in different frequency characteristics of the product, as well as the main application.

First, the low-frequency (from 125KHz to 134KHz)

In fact, the low frequency RFID technology in a wide range of applications and promotion. The frequency is mainly through the inductively coupled manner, that is, the reader coil and sensor coils with transformer coupling. adoption of the reader role of alternating field in the sensor antenna induction voltage be rectifying that can be used for supply voltage magnetic field using. regions could very well be defined, but the intensity drop too fast.


1. work in low-frequency sensors of general operating frequency from 120KHz to 134KHz, TI 134.2KHz frequencies to. The band wavelength approximately 2500m.

2. Apart from the effect of metal materials, low frequency to pass through any material items without reducing its reading distance.

3. work in low frequency of readers in the world do not have any special license restrictions.

4. low frequency products have a different package. Good package is the price is too expensive, but there are more than 10 years of life.

5. Although the frequency of the magnetic field region declined quickly, but can be relative uniformity of reading and writing area.

6. with respect to the other band's RFID products, the band data transfer rate is slow.

7. sensors prices relative to other frequency bands.

Main application:

1. husbandry management system

2. car alarm and Keyless door system

3. marathon system application

4. automatic parking fees and vehicle management system

5. application of the automatic filling system

6. application of the hotel door lock system

7. access control and security management system

In line with international standards:

A) application of animal husbandry ISO11784RFID-coding structure

B) application of animal husbandry ISO11785RFID-technology theory

C) application of animal husbandry ISO14223-1RFID-air interface

D) application of animal husbandry ISO14223-2RFID-protocol definition

E) define the low-frequency ISO18000-2 physical layer, anti-collision and communication protocols

F) DIN30745 mainly European waste management application-defined criteria

Second, high-frequency (frequency for 13.56MHz)

In the frequency of the sensor no longer needs to be wound coil, can live through corrosion printing production of antennas. Inductor in General through the load modulation modes of work. It is through the sensors on the load resistance of connected and disconnected prompted the reader antenna's voltage changes, implement distance sensors on antenna voltage amplitude modulation. If people through data control load voltage is switched on and off, then these data will be transferred from the sensor to the reader.


1. the operating frequency is the frequency of 13.56MHz, about 22m wavelength.

2. in addition to the metal material, the frequency of wavelength can pass through most of the material, but often reduces the reading distance. The sensor requires some distance away from the metal.

3. the band in the world are recognized and no special restrictions.

4. the sensors are generally in the form of an electronic label.

5. Although the frequency of the magnetic field region declined quickly, but can be relative uniformity of reading and writing area.

6. the system with anti-collision feature, you can also read more tag.

7. you can put some data information is written to the tag.

8. data transmission rates faster than low frequency, price is not very expensive.

Main application:

1. application of bool management system

2. the management and application of gas cylinders

3. a garment production and logistics systems management and applications

4. three table prepayment system

5. Hotel door lock management and application

6. large conference staff channel system

7. fixed asset management system

8. medical logistics systems management and applications

9. smart shelf management

In line with international standards:

A) ISO/IEC14443 close coupling of IC card, maximum reading distance to 10cm.

B) ISO/IEC15693 sparse coupling IC card, maximum reading distance to 1m.

c)ISO/IEC18000-3 the standard defines the physical layer 13.56MHz system, anti-collision algorithm and communication protocols.

D) conform to the definition 13.56MHz 13.56MHzISMBandClass1 EPC interface definition.

Third, the very high frequency (frequency for 860MHz to 960MHz)

VHF system through the electric field to transfer the energy. Electric energy decline not quickly, but reading area is not very good. The band reading distance farther, passive to 10m. Mainly through capacitive coupling approach to implementation.


1. in the band, global definition is not very same-Europe and parts of Asia-defined frequency 868MHz, North America defined band to 902 to 905MHz, between the Japan proposed band to 950 to 956. The band of wavelengths around 30cm.

2. at present, the band power output current uniform definition (United States defined as 4W, Europe is defined as 500mW). May the European limit will increase to 2WEIRP.

3. VHF band radio controlled not by a lot of material, especially water, dust, mist, suspended particulate material. Relative to the high-frequency electronic label, the band of the electronic label does not require separate and metal.

4. RFID tag antennas are generally long and labels. Antenna are linear and circular polarized two designs to meet different application requirements.

5. the band have good reading distance, but is very difficult to read area defined.

6. has the very high data transfer rate, in a very short period of time to read large amounts of electronic labels.

Main application:

1. supply chain management and application

2. production line of automated management and application

3. air traffic management and application packages

4. a container management and application

5. railway package management and application

6. application of logistic management system

In line with international standards:

A) ISO/IEC18000-6 defines the physical layer and VHF communication protocol; air interface defines TypeA and TypeB two parts; support to read and write operations.

EPCglobal b) defines the structure of electronic goods coding and VHF air interfaces and communications protocols. For example: Class0, Class1, UHFGen2.

C) UbiquitousID Japan organization, define UID coding structure and traffic management protocols.

We have no doubt that in the future, VHF products will receive a large number of applications. Such as WalMart, Tesco, United States Department of Defense and Metro supermarkets are in their supply chain using RFID technology.

No comments:

Post a Comment