1. What is RFID
I believe many people do not understand the basic meaning of RFID. RFID means “radio frequency identification” in Chinese, and its full English name is “radio frequency identification”. It is often called inductive electronic chip or proximity card, inductive card, contactless card and so on.
A complete set of RFID system is composed of reader and transponder. Its action principle is that the reader transmits infinite wave energy of a specific frequency to the transponder, which is used to drive the transponder circuit to send out the internal ID code. At this time, the reader receives the ID code.
The transponder is battery free, contactless and card free, so it is not afraid of dirt. Moreover, the chip password is the only one in the world that cannot be copied, with high security and long life.
RFID is widely used. At present, typical applications include animal chip, car chip anti-theft device, access control, parking lot control, production line automation and material management.
There are two kinds of RFID Tags: active tags and passive tags.
2. What is an electronic label
Electronic tag is RFID, some called radio frequency tag, radio frequency identification.
It is a non-contact automatic identification technology, through the radio frequency signal to identify the target and obtain relevant data, identification work without manual intervention.
As a wireless version of barcode, RFID technology has many advantages, such as waterproof, antimagnetic, high temperature resistance, long service life, long reading distance, data on the label can be encrypted, larger storage capacity, and storage information can be changed freely.
3. What is RFID technology?
RFID (radio frequency identification) is a non-contact automatic identification technology. It can automatically identify the target and obtain the relevant data through the radio frequency signal. The identification work does not need manual intervention, and can work in a variety of harsh environments.
RFID technology can identify high-speed moving objects and multiple tags at the same time, which is fast and convenient to operate.
Short range RF products are not afraid of oil stains, dust pollution and other harsh environment, and can replace bar code in such environment, such as tracking objects on the factory assembly line. Long distance RF products are mostly used in traffic, and the identification distance can reach tens of meters, such as automatic charging or vehicle identification.
4. What is RFID solution
RFID solution is an RFID application scheme formulated by RFID technology suppliers according to the development characteristics of the industry, which can be “tailored” according to the actual requirements of different enterprises.
RFID solutions can be classified by industry, such as logistics, anti-counterfeiting, identity recognition, asset management, animal management, quick payment, etc.
5. What is RFID middleware
RFID is one of the top ten strategic technologies that enterprises should consider to introduce in 2005, and middleware can be regarded as the operation center of RFID, because it can accelerate the emergence of key applications.
The potential of RFID industry is endless, and its application scope covers manufacturing, logistics, medical treatment, transportation, retail, national defense and so on. According to Gartner Group, RFID is one of the top ten strategic technologies recommended by enterprises in 2005. However, the key to its success is not only the price of tag, the design of antenna, the standardization of band and the certification of equipment, but also the key application software (killer application).
Middleware can be called the center of RFID operation, because it can accelerate the emergence of key applications.
6. Basic components of RFID system?
The basic RFID system consists of three parts
Tag: composed of coupling elements and chips, each tag has a unique electronic code, which is attached to the object to identify the target object;
Reader: a device that reads (and sometimes writes) tag information, which can be designed as a handheld or fixed device;
Antenna: transmit RF signal between tag and reader.
7. What makes retailers like RFID so much?
According to Sanford C. Bernstein’s retail analysts, Wal Mart can save $8.35 billion a year by using RFID, most of which is due to labor costs saved by not having to manually check the barcode of incoming goods.
Although some other analysts think that the figure of $8 billion is too optimistic, there is no doubt that RFID can help solve the two biggest problems in the retail industry: out of stock and loss of goods (products lost due to theft and disruption of the supply chain). Now Wal Mart’s loss in one year is almost $2 billion due to theft alone, If the turnover of a legal enterprise can reach this figure, it can be ranked 694 in the list of 1000 largest enterprises in the United States.
The Institute estimates that this RFID technology can help reduce theft and inventory levels by 25%.
8. Basic introduction of RFID RFID tag:
Radio frequency identification (RFID) is a non-contact automatic identification technology. Its basic principle is to realize the automatic identification of the identified object by using the transmission characteristics of radio frequency signal and spatial coupling (inductive or electromagnetic coupling) or radar reflection.
RFID system includes at least two parts: tag and reader. Electronic tag is the data carrier of RFID system, which is composed of tag antenna and tag chip.
According to the different power supply modes of electronic tags, electronic tags can be divided into active tag, passive tag and semi passive tag. The active tag is equipped with batteries, while the passive tag is not equipped with batteries. The semi passive tag works partly on batteries.
According to the different frequency, electronic tags can be divided into low frequency electronic tags, high frequency electronic tags, ultra high frequency electronic tags and microwave electronic tags. According to the different packaging forms, it can be divided into credit card label, linear label, paper label, glass tube label, circular label and special-shaped label.
RFID reader (reader writer) communicates with RFID tag through antenna, which can read or write tag identification code and memory data. A typical reader consists of a high frequency module (transmitter and receiver), a control unit, and a reader antenna.
9. RFID development history:
RFID directly inherits the concept of radar and develops a new technology of AIDC RFID technology. Harry in 1948. “Communication using reflected power” published by stockman laid the theoretical foundation of RFID.
1) The development history of RFID technology. In the 20th century, the research on the theory and application of radio technology is one of the most important achievements in the development of science and technology. The development of RFID technology can be divided into 10 years as follows:
1941-1950. The improvement and application of radar gave birth to RFID technology, and laid the theoretical foundation of RFID technology in 1948.
1951-1960. The early exploration stage of RFID technology is mainly in the laboratory experimental research.
1961-1970. The theory of RFID technology has been developed, and some application attempts have been started.
1971-1980. RFID technology and product R & D are in a period of great development, and various RFID technology tests have been accelerated. Some of the earliest RFID applications have emerged.
1981-1990. RFID technology and products enter the stage of commercial application, and various scale applications begin to appear.
1991-2000. RFID technology standardization has been paid more and more attention, RFID products have been widely used, RFID products have gradually become a part of people’s life.
Since 2001. People are paying more and more attention to standardization. There are more and more kinds of RFID products
Passive electronic tags and semi passive electronic tags have been developed, the cost of electronic tags has been reduced, and the scale of application industry has expanded.
The theory of RFID technology has been enriched and improved. Single chip electronic tag, multi tag reading, wireless readability and writability, remote identification of passive electronic tags, RFID adapting to high-speed moving objects are becoming a reality.
How RFID works
Electronic tag is also called radio frequency tag, transponder and data carrier; Reader is also called readout device, scanner, communicator, reader (depending on whether the electronic tag can rewrite data wirelessly).
The space (contactless) coupling of RF signal is realized between the tag and the reader through the coupling element. In the coupling channel, according to the time sequence relationship, the energy transmission and data exchange are realized.
There are two types of RF signal coupling between reader and tag
(1) Inductive coupling: transformer model, coupling is realized by space high frequency alternating magnetic field, which is based on the law of electromagnetic induction;
(2) Electromagnetic backscattering coupling: the radar principle model, the electromagnetic wave emitted, after meeting the target, reflects and carries back the target information, according to the spatial propagation law of electromagnetic wave.
Inductively coupled mode is generally suitable for low and medium frequency short range RFID system. Typical operating frequencies are 125kHz, 225khz and 13.56MHz. The recognition distance is less than 1m, and the typical distance is 10-20cra.
Electromagnetic backscatter coupling is generally suitable for long-distance RFID system with high frequency and microwave operation. Typical operating frequencies are: 433MHz, 915MHz, 2.45GHz, 5.8GHz. The recognition action distance is more than 1 m, and the typical action distance is 3-10 M.
Editor in charge: CT