Briefly describe the main features of RFID technology

There are many types of RFID devices, such as: RFID channel door devices can prevent theft and improve security, RFID access control systems can effectively prevent unauthorized people from entering or carrying unauthorized items in and out, thereby reducing theft and improving security, when abnormal or unauthorized items are detected, the system can immediately send out an alarm and take corresponding measures.

RFID consists of three parts: electronic tags.

Antennas, readers. It is characterized by easy miniaturization and diverse shapes, environmental resistance, reusability, penetration, large memory capacity of data, and system safety.

Data Security. The disadvantages of RFID are as follows:

1. Technology maturity.

Inadequate. RFID technology has been around for a relatively short time and is not very mature in terms of technology. Due to the retroreflective characteristics of UHF RFID electronic tags, it is difficult to apply them in metals, liquids and other commodities;

2. High cost. RFID electronic tags are higher than ordinary barcode labels, dozens of times that of ordinary barcode labels, if the amount of use is large, it will cause the cost to be too high, which greatly reduces the enthusiasm of the market to use RFID technology;

3. The security is not strong enough. The security problems faced by RFID technology are mainly manifested in the illegal reading and malicious tampering of RFID electronic tag information;

4. The technical standards are not uniform.

The development trend of RFID:

1. Radio frequency identification tags.

Trend. With the formulation of standards, a wide range of application fields, an increase in the number of applications, the continuous improvement of technology, and the rapid progress of technology (such as in the case of books, on the cover or copyright page.

on the radio frequency identification antenna directly printed with conductive ink), its cost will be lower;

2. High frequency. Compared with the low-frequency system, the UHF radio frequency identification system has a long identification distance, faster data exchange speed, higher difficulty in counterfeiting, stronger anti-interference ability to the outside world, small size, and with the cost of manufacturing.

The further improvement of high-frequency technology will make the application of UHF system more extensive;

3. Networking. The second-generation ID card used.

Train tickets are collected at the automatic ticket machine, which requires the network management of the radio frequency identification system to realize the remote control and management of the system;

4. Multi-functional. With the continuous improvement and popularization of mobile computing technology, the development trend of RFID reader design and manufacturing is to develop to multi-functional, multi-interface, multi-standard, modular, miniaturized, portable and embedded. At the same time, multi-reader coordination and networking technology will become one of the future development directions.

Briefly describe how RFID works: Low-frequency RFID technology has been used for close-range access management. Due to its low signal-to-noise ratio, its reading distance is greatly limited, the anti-collision performance of the low-frequency system is poor, the speed is slow when reading multiple tags at the same time, and the performance is also easily affected by other electromagnetic environments.

Electronic tags are also known as transponders and data carriers; The reader is also known as the readout device, the scanner, the communicator, the reader (depending on whether the electronic tag can rewrite the data wirelessly). The spatial (non-contact) coupling of RF signals is realized between the electronic tag and the reader through the coupling element, and the energy transmission and data exchange are realized in the coupling channel according to the timing relationship.

There are two types of coupling of RF signals that occur between the reader and the transponder.

One is: inductive coupling. The transformer model, coupled by a high-frequency alternating magnetic field in space, is based on the laws of electromagnetic induction.

The second is: electromagnetic backscatter coupling: radar principle model, the emitted electromagnetic waves, reflected after hitting the target, and at the same time carrying back the target information, based on the spatial propagation law of electromagnetic waves The inductive coupling method is generally suitable for the short-range radio frequency identification system for medium and low frequency work.

Typical operating frequencies are: 125kHz, 225kHz and 13 56MHz. The recognition range is less than 1m, and the typical range is 10 20cra.

The electromagnetic backscatter coupling method is generally suitable for long-distance RFID systems with high frequency and microwave operation. Typical operating frequencies are: 433MHz, 915MHz, 2 45GHz, 5 8GHz.

The recognition distance is greater than 1m, and the typical distance is 3-l0m.

Radio Frequency Identification (RFID) is an abbreviation for Radio Frequency Identification. Its principle is non-contact data communication between the reader and the tag to achieve the purpose of identifying the target. RFID has a wide range of applications, typical applications are animal chips, automotive chip immobilizers, access control, parking lot control, production line automation, and material management.

RFID principle - the most basic RFID system is composed of three parts: electronic tags, readers and computer networks.

RFID is radio frequency identification technology, and the composition of RFID system is composed of RFID tag + reader + application software.

Applicability: RFID technology relies on electromagnetic waves and does not require physical contact between the two front axles. This allows it to connect and communicate directly regardless of dust, fog, plastic, paper, wood, and other obstacles. Calendar.

The software components in the RFID system mainly complete the storage, management and reading and writing control of RFID tags, which are independent of RFID hardware. RFID systems are ultimately for applications, and the interface between the reader and the application system is usually done by software components.

RFID generally refers to radio frequency identification technology (a communication technology term). RFID, also known as Radio Frequency Identification, is a communication technology that can identify specific targets and read and write relevant data through radio signals without the need to establish mechanical or optical contact between the identification system and the specific target.

RFID is the abbreviation of RadiofrequencyIdentification, that is, Radio Frequency Identification, commonly known as electronic tags.

Typical applications include animal chips, automotive chips, burglar alarms, access control, parking lot control, production line automation, and material management.

Radio Frequency Identification (RFID) is an abbreviation for Radio Frequency Identification.

The principle is a contactless data communication between the reader and the tag to achieve the purpose of identifying the target.

1.Highway toll collection and intelligent transportation systems.

The automatic toll collection system of expressways is a technology that has been used in radio frequency identification technology for a long time. REID technology can give full play to its advantages in automatic highway toll collection. When the vehicle passes through the toll station at high speed, the payment is automatically completed, which solves the traffic jam phenomenon caused by the problem of charging through the entrance, improves the speed, avoids congestion, and improves the efficiency of toll collection.

2.Automatic control.

RFID technology has the characteristics of strong resistance to harsh environments and non-contact identification, and has many applications in production process control. Through the use of RFID technology on the automated assembly line of large factories, the automatic control and monitoring of material tracking and production process are realized, which improves production efficiency, improves production methods and reduces costs.

3.E-tickets.

Radio frequency identification systems, especially contactless IC cards (electronic tags), have the greatest potential for use in the field of public transport. The use of electronic tags as electronic tickets has the advantages of easy use, shortened transaction time, and reduced operating costs.

RFID features.

1) Readwrite function of data:

As long as the RFIDreader is passed, the information can be read directly into the database without contact, and multiple tags can be processed at one time, and the status of logistics processing can be written into the tag for the next stage of logistics processing.

b) Easy miniaturization and diversification of shapes:

RFID is not limited by size and shape, and does not need to match the fixed size and printing quality of the paper for reading accuracy. In addition, RFID electronic tags can be miniaturized and applied in different products. As a result, the production of products can be controlled more flexibly, especially for applications on the production line.

3) Environmental resistance:

Paper can't be seen when it's dirty, but RFID is highly resistant to substances such as water, oil, and pharmaceuticals. RFID can also read data in dark or dirty environments.

d) Reusable:

Since RFID is electronic data and can be overwritten repeatedly, it can be reused as a label. For example, passive RFID can be used without batteries, and there is no need for maintenance.

v) Penetration:

RFID can also communicate through if it is coated with non-metallic or non-transparent materials such as paper, wood, and plastic. However, if it is ferrous metal, communication is not possible.

6) Large memory capacity of data:

The data capacity will expand with the development of memory specifications, and the amount of data that will need to be carried by items in the future will become larger and larger, and the demand for the expandable capacity of the label will also increase, and RFID will not be limited to this.

7) System security:

Transferring product data from the computer to the workpiece will provide security for the system and greatly improve the safety of the system.

8) Data Security:

The accuracy of the data stored in the RF tag is guaranteed by the method of check or cyclic redundancy check.

Performance characteristics of RFID technology.

1.Quick Scan. The RFID reader can recognize and read several RFID tags at the same time.

2.Miniaturization and variety of shapes. RFID is not limited by size and shape, and does not need to match the fixed size and printing quality of the paper for reading accuracy.

In addition, RFID tags can be developed into miniaturization and diverse forms to be applied to different products.

3.Contamination resistance and durability. Traditional barcodes are carrier-based on paper and are therefore susceptible to contamination, but RFID is highly resistant to substances such as water, oil, and chemicals.

In addition, because the barcode is attached to a plastic bag or outer carton, it is particularly susceptible to damage; RFID labels store data in a chip, so it is protected from defacement.

4.Reusable. Today's barcodes cannot be changed after printing, and RFID tags can repeatedly add, modify, and delete the data stored in the RFID label, which is convenient for information updates.

5.Penetrating and barrier-free reading. When covered, RFID is able to penetrate non-metallic or non-transparent materials such as paper, wood, and plastic, and is capable of penetrating communication.

Barcode scanners, on the other hand, can only read barcodes at close range and without being obstructed by objects.

6.The memory capacity of the data is large. The capacity of a 1D barcode is 50 bytes, the maximum capacity of a 2D barcode can be stored from 2 to 3000 characters, and the maximum capacity of RFID is several megabytes

With the development of memory carriers, there is also a tendency for data capacity to expand. In the future, the amount of data that items need to carry will increase, and the demand for the capacity that can be expanded by the label will also increase.

7.Security. Since RFID carries electronic information, its data content can be protected by a password, making it difficult to be forged and altered.

Radio Frequency Identification (RFID) technology, also known as Radio Frequency Identification, is a communication technology that can identify specific targets through radio signals and read and write relevant data without establishing mechanical or optical contact between the identification system and the specific target.

The characteristics of RFID recognition technology are:

1) Two-way communication; (2) be able to identify objects moving at high speed; (Edition 3) Size miniaturization and shape diversification; (4) Anti-pollution ability and durability; (5) Reusable; (6) Penetrating and barrier-free reading, the advantages of the RF system are not limited to the line of sight, the recognition distance is farther than the optical system, and it can penetrate non-metallic objects; (7) The memory capacity of the data is large and can carry a large amount of information; (8) Strong security, RFID is difficult to forge, can work in a variety of harsh environments, contact-free, strong anti-interference ability, and identification work does not require manual intervention.

RFID tag: It is a non-contact automatic identification technology.