1、What is RFID?

RFID stands for Radio Frequency Identification, which is called radio frequency identification in Chinese. It is a very commonly used communication technology at present. It can identify specific targets and read and write related data through radio signals without the need to establish mechanical or optical contact between the identification system and specific targets. RFID is currently one of the most mature technologies used in the perception layer of the Internet of Things. A typical RFID system includes four components: RFID tags, readers, read-write antennas, and application software. 

2、Classification of RFID air interface protocol standards

From the point of view of the air interface protocol that the chip conforms to: The current common UHF RFID air interface protocols in China include international standards, national standards, industry standards, and corporate standards. The mainstream chips in the market basically refer to ISO/IEC 18000-6C.

(1) International standards: ISO/IEC 18000-6 series standards, including ISO/IEC18000-6A(61), ISO/IEC 18000-6B(62), ISO/IEC18000-6C(63, EPCC1GEN 2), ISO/ IEC 18000-6D(64);

(2) National standard: China National Standard GB/T29768-2013 Information Technology Radio Frequency Identification 800/900MHz Air Interface Protocol:

(3) National military standard: GJB 7377.12011 military radio frequency identification air interface:

(4) Industry standards: Electronic Vehicle Identification (ERI) standards in China's transportation industry, etc., used for high-speed vehicle identification.

3、UHF band map of major regions in the world

(1) China frequency band 840-844MHz, 920-924MHz

(2) Japanese frequency band 920-928MHz

(3) Hong Kong, Thailand, Singapore frequency band 920-925MHz

(4) Canada, the United States, Mexico, Puerto Rico, South America frequency band 902-928MHz

(5) EU frequency band 865-868MHz

4、UHF RFID reader selection

Integrated UHF RFID Reader Selection Guide

Advantages of integrated reader:

1. The antenna and the reader are integrated in a closed wall, with a working protection level of IP67, suitable for outdoor use;

2. Since the back cover wall of the reader is made of metal material, it is convenient for the reader to dissipate heat, which is beneficial to long-term outdoor work;

3. The reader interface wiring is simple, mainly for power and communication lines, which is very suitable for rapid deployment;

4. It is easy to install the clip code holding pole of the integrated reader manufacturer accessories, and non-professionals can also construct;

5. The integrated reader has a beautiful appearance, and the face cover can be made of ABS plastic, which is conducive to the mass production of industrial design molds; and anti-aging and anti-ultraviolet formulas are added;

6. The integrated reader/writer is cost-effective and relatively cheap;

Application field of integrated reader:

1. The integrated reader is mainly used in the non-intensive situations where a large number of tags need to be read for the identification of vehicles, personnel access control, industrial production line material identification, etc.;

2. The reading distance of the integrated reader can be selected according to the use scene, the required reading distance, and the antenna irradiation angle to select the integrated reader with different gains and irradiation angles;

3. VANCH has 4dBi, 5dBi, 7dBi, 9dBi, 12dBi antenna gain all-in-one machines, corresponding to reading distances of 2.5 meters, 5 meters, 7 meters, 9 meters, 12 meters or more, etc. (The output power of the reader can be adjusted To adjust the card reading distance)

Fixed UHF RFID Reader Selection Guide

Fixed RFID reader, also known as split RFID reader, the reading and writing part of the fixed reader is arranged separately from the RFID antenna, and the radio frequency signal between them is connected by a coaxial cable

Advantages of fixed readers:

1. The control circuit and radio frequency circuit of fixed RFID readers are relatively complicated, and require high performance indicators for readers, especially technologies such as radio frequency interference cancellation and multi-tag reading anti-collision algorithms.

2. The RF output power of the fixed reader can reach 30-33dBm, which is better than the integrated RFID reader in the reading distance and reading multi-tag performance;

3. The functions of fixed RFID readers are more abundant, and there are more choices of GPIO interface, communication interface, etc., which makes it easier to realize project system integration;

4. The outdoor installation of the fixed reader/writer host needs to be equipped with a waterproof outer box, and the work between the reader and the antenna needs to be connected through a good quality coaxial feeder to ensure its long-term stable operation;

5. The application scenarios of fixed readers are wider, and the readers can be competent for more complex working environments, for example; requiring fast tags, a large number of inventories, long distances, fast speeds, etc.;

6. VANCH fixed reader/writer MCU is based on the ARM microcontroller chip, linux, Android, system and other technology platforms to develop a fixed reader/writer to meet the needs of customers in all aspects;

Application areas of fixed readers:

Fixed readers are commonly used in warehouse logistics, supply chain environment material inventory, warehousing management, clothing, footwear, jewelry retail department stores, from factory to terminal retail store management; also commonly used in anti-counterfeiting traceability, book file management, etc. .

5、Matching table of VANCH reader and cable and connector

6、Conversion table of power unit mw and dbm