What is RFID technology?
RFID radio frequency identification is a non-contact automatic identification technology. It automatically identifies the target object and obtains related data through radio frequency signals. The identification work does not require manual intervention and can work in various harsh environments. RFID technology can identify high-speed moving objects and identify multiple tags at the same time, which is fast and convenient to operate.
RFID is a simple wireless system with only two basic devices. This system is used to control, detect and track objects. The system consists of an interrogator (or reader) and many transponders (or tags).
Classification of RFID
According to different application frequencies, RFID is divided into low frequency (LF), high frequency (HF), ultra high frequency (UHF), and microwave (MW). The corresponding representative frequencies are: low frequency below 135KHz, high frequency 13.56MHz, ultra High frequency 860M ~ 960MHz, microwave 2.4G, 5.8G
According to the way of energy supply, RFID is divided into passive RFID, active RFID, and semi-active RFID. Passive RFID has a short read-write distance and low price. Active RFID can provide a longer read-write distance, but requires battery power and higher cost. It is suitable for long-distance read-write applications.
What are the basic components of RFID?
Tag: Consists of a coupling element and a chip, each tag has a unique electronic code attached to the object to identify the target object;
Reader: A device that reads (and sometimes writes) tag information, and can be designed to be handheld or fixed;
Antenna: Passes RF signals between the tag and the reader.
What is the basic working principle of RFID technology?
The basic working principle of RFID technology is not complicated: after the tag enters the magnetic field, it receives the RF signal from the reader, and uses the energy obtained by the induced current to send out the product information stored in the chip (passive tag, passive tag or passive tag) , Or actively send a signal of a certain frequency (Active Tag, active tag or active tag); after the reader reads the information and decodes it, it sends it to the central information system for related data processing.
A complete RFID system is composed of three parts: a reader and an electronic tag (TAG), a so-called transponder and an application software system. The working principle is that the reader transmits a specific frequency. The radio wave energy is given to the Transponder, which is used to drive the Transponder circuit to send out the internal data. At this time, the Reader sequentially receives the interpretation data and sends it to the application for corresponding processing.
In terms of the communication and energy sensing methods between RFID card readers and electronic tags, it can be roughly divided into two types: inductive coupling and backscatter coupling. Generally, the first type of low-frequency RFID uses the first type. Most of the higher frequencies use the second method.
Depending on the structure and technology used, the reader can be a reading or reading / writing device, and it is an RFID system information control and processing center. The reader usually consists of a coupling module, a transceiver module, a control module and an interface unit. The reader and transponder generally use half-duplex communication to exchange information. At the same time, the reader provides energy and timing to the passive transponder through coupling. In practical applications, management functions such as collection, processing, and remote transmission of object identification information can be further realized through Ethernet or WLAN. The transponder is the information carrier of the RFID system. At present, most of the transponders are passive units composed of coupling elements (coils, microstrip antennas, etc.) and microchips.
让 What makes retailers so respectful of RFID?
By using RFID, Wal-Mart can save $ 8.35 billion annually, most of which is the labor cost saved because it does not require manual inspection of incoming barcodes. Although some other analysts think the $ 8 billion figure is too optimistic, there is no doubt that RFID helps solve the two biggest problems in the retail industry: product out of stock and loss (products lost due to theft and disruption of the supply chain) , And now theft alone, Wal-Mart's loss is almost 2 billion US dollars a year, if a legitimate company's turnover can reach this number, it can be ranked 694 in the list of the 1000 largest companies in the United States . Research institutions estimate that this RFID technology can help reduce theft and inventory levels by 25%.
What is the typical application of RFID technology?
1. Product performance: As the frequency of most products covers 868MHz to 915MHz, the requirements for the corresponding read-write equipment in the system can be reduced, and the sensitivity to frequency deviation is reduced.
2. The product complies with: EPC CLASS 1 GEN 2 and ISO18000-6C.
3. Professional services: make use of the world's advanced product experience to make specific considerations of commonly used products.
4. Adaptation areas: logistics and supply management, manufacturing and assembly, aviation baggage handling, mail, express parcel handling, document tracking, library management animal identification, sports timing, access control, electronic tickets, automatic toll collection. Long range UHF tags to tiny UHF tags. Can do customized production for customers to meet various requirements.
Meets various standards such as international ISO15693, ISO18000-6B, EPC G2, etc. It can use different antenna designs and packaging materials to make various forms of labels, such as vehicle labels, pallet labels, logistics labels, metal labels, book labels, liquids Tags, personnel access tags, ticket tags, luggage tags, etc. Customers can choose or customize the corresponding electronic tags according to their needs.
RFID read-write equipment
RFID can only play its role when there is a read-write device. RFID reader devices include RFID card readers, RFID reader modules, etc.
的 Impact of metal and liquid environment on RFID
RFID Ultra High Frequency (UHF) tags are sensitive to environments such as metal and liquid due to the characteristics of electromagnetic backscatter. Passive tags that can cause this working frequency are difficult to be applied on metal surfaces. Work in a liquid or liquid environment, but such problems have been completely resolved with the development of technology