RFID question and answer

What is RFID?
RFID is the abbreviation of Radio Frequency Identification, which is radio frequency identification.

What is RFID technology?
RFID radio frequency identification is a non-contact automatic identification technology. It automatically identifies target objects and obtains relevant data through radio frequency signals. The identification work can work in various harsh environments without manual intervention. RFID technology can identify high-speed moving objects and can identify multiple labels at the same time, and the operation is quick and easy.
Short-range RF products are not afraid of harsh environments such as oil stains and dust pollution. Barcodes can be used in such environments, for example, to track objects on the factory's assembly line. Long-range radio frequency products are mostly used for traffic, and the recognition distance can reach several tens of meters, such as automatic charging or identification of vehicle identities.

The components of RFID The most basic RFID system consists of three parts:
Tag: It consists of a coupling element and a chip. Each tag has a unique electronic code and is attached to the object to identify the target object.
Reader: A device that reads (sometimes writes) tag information and can be designed to be handheld or stationary;
Antenna: Passes RF signals between tags and readers.
The electronic tag generally stores electronic data in a predetermined format. In practical applications, the electronic tag is attached to the surface of the object to be recognized. The reader can read and recognize the electronic data stored in the electronic tag without contact, so as to achieve the purpose of automatically identifying the body. Usually the reader is connected to the computer and the read tag information is transmitted to the computer for further processing.

The working principle of RFID The reader sends a radio frequency signal with a certain frequency through the antenna. When the tag enters the magnetic field, it generates the inductive current to obtain energy. Sending out its own code and other information is read and decoded by the reader and sent to the computer host for processing. .

RFID tag classification RFID tags are classified into passive tags and active tags. The active tag itself is battery-powered, has a relatively long read/write distance and is large in size, and is more costly than a passive tag, also referred to as an active tag. Passive tags obtain the energy required for operation by the magnetic field generated by the reader. The cost is low and has a long service life. It is smaller and lighter than the active tag, and the reading and writing distance is relatively short. It is also called a passive tag.

The operating frequency of the FID system is usually the frequency used by the reader when it is transmitted, which is called the operating frequency of the RFID system and is basically divided into three ranges: low frequency (30kHz-300kHz), high frequency (3MHz-30MHz) and UHF ( 300MHz-3GHz). The common operating frequencies are low frequency 125kHz, 134.2kHz and high frequency 13.56MHz.

Can a reader handle multiple tags at the same time?
By using anti-collision technology, RFID systems can handle multiple tags at the same time. For example, TI's 13.56-MHz system can handle about 50 tags per second.

Is the RFID system reading and writing the same distance?
In general, the maximum distance at which information can be written to the tag is less than the maximum distance at which the tag is read, which is approximately 40% to 80% of the reading distance.

Factors affecting the reading and writing distance of the RFID system The magnetic field generated by the reader;
Sensing sensitivity, especially in complex environments;
The tag itself gains energy and the ability to send information.

What is the trend of RFID technology development?
Tag cost reduction Read/write distance increase Tag storage capacity increase Processing time shortened Why is EAS also an RFID system?
The EAS merchandise anti-theft system is a special (1Bit) RFID system. The label has only two coding states. When the reader (sensor) senses one of the states, it will alarm. With the development of RFID technology, the future EAS system can also display the name and quantity of the stolen goods at the same time as the alarm.

What are the advantages of RFID technology over Barcode technology?

Bar code is a widely used automatic identification technology, but RFID has obvious advantages compared to it:
No light source required, even data can be read through external materials;
Long service life, able to work in harsh environments;
Can be easily embedded or attached to different shapes and types of products;
Reading distance farther;
Can write and access data, writing less time than printing barcodes;
The content of the tag can change dynamically;
Ability to handle multiple tags at the same time;
Tag data access is password protected and safer;
The object to which the RFID tag is attached can be tracked and positioned.

Some Typical Applications of RFID Systems Logistics and Supply Management Manufacturing Manufacturing and Assembly Air Baggage Handling Mail/Express Package Processing Document Tracking/Library Management Animal Identification Sports Time Access Control/Electronic Tickets Road Automatic Charges

What benefits does RFID technology bring to logistics and supply chain management?

Accuracy and timeliness of information is a key factor in logistics and supply chain management, and RFID technology can provide sufficient guarantees for this. The RFID system greatly enhances the transparency of the supply chain. Items can be tracked in real time anywhere in the supply chain, eliminating manual errors in the past. Readers installed in factories, distribution centers, warehouses, and store shelves can automatically record the flow of items throughout the supply chain—from the production line to the end consumer.