1.Introduction to RFID Technology
Radio Frequency Identification (RFID) is a technology that uses radio waves to achieve non-contact automatic identification. The RFID system communicates with electronic tags through radio waves to achieve identification and data exchange of target objects. RFID technology has a wide range of applications in fields such as automatic identification, item tracking, and data collection.
The development history of RFID technology can be traced back to the 1940s, which was derived with the advancement of radar technology. After decades of development, RFID technology has moved from laboratory research to commercial applications, becoming one of the most promising information technologies of the 21st century. The basic working principle of RFID system is that after the tag enters the recognition range of the reader, it receives the RF signal emitted by the reader, and uses the energy obtained by induced current to send the product information stored in the chip (Passive Tag), or the tag actively sends a signal of a certain frequency (Active Tag). After the reader reads and decodes the information, it is sent to the central information system for data processing.
1.1 Definition and Composition of RFID Tags
RFID tags, also known as smart tags or radio frequency cards, are data carriers that store data and can communicate with readers through radio waves. The composition of RFID tags mainly includes the following parts:
- Chip: Contains logic control unit and memory unit, responsible for processing data and storing information.
- Antenna: used to receive signals emitted by the reader and send tag data back to the reader.
- Packaging material: protects the chip and antenna while ensuring that the tag can function properly in specific environments.
RFID tags can be classified into various types based on their power supply method, operating frequency, reading and writing capabilities, and are suitable for different application scenarios.
2. RFID tag types and application scenarios
2.1 Classification by power supply method
2.1.1 Passive RFID tags
Passive RFID tags do not have built-in power sources, they are powered by receiving radio wave energy emitted by the reader/writer. The characteristics of this type of label are low cost, small size, and long lifespan, but the recognition distance is relatively short.
Application Scenario:
Retail industry: used for inventory management and anti-theft of goods.
Library: used for tracking and borrowing management of books.
Medical industry: used for monitoring medical devices and drugs.
2.1.2 Active RFID tags
Active RFID tags have built-in batteries that can actively send signals to the reader/writer. This type of label has a long recognition distance, but is costly and limited by battery life.
Application Scenario:
Logistics and supply chain management: used for tracking containers and pallets.
Intelligent transportation system: used for vehicle recognition and toll collection.
2.1.3 Semi active RFID tags
Semi active RFID tags are typically in a dormant state, only supplying power to the portion of the tag that holds data. When the tag enters the recognition range of the reader/writer, it is activated by the reader/writer.
Application Scenario:
Personnel positioning: Track workers in large factories or warehouses.
Asset management: used for monitoring and managing high-value assets.
2.2 Classification by working frequency
2.2.1 Low frequency (LF) RFID tags
Low frequency tags operate between 125kHz and 134kHz and have good penetration and anti-interference properties.
Application Scenario:
Animal tracking: used for livestock management and wildlife conservation.
Access control system: used for secure access control.
2.2.2 High frequency (HF) RFID tags
High frequency tags operate at 13.56MHz and are suitable for short distance, high-speed data transmission.
Application Scenario:
Mobile payments: such as bus cards and electronic wallets.
Book management: used for automated management of libraries.
2.2.3 Ultra high frequency (UHF) RFID tags
The ultra-high frequency tag operates between 860MHz and 960MHz, with a long recognition distance and fast data transmission capability.
Application Scenario:
Warehouse logistics: used for rapid inventory and tracking of large quantities of goods.
Manufacturing automation: used for material management and quality control on production lines.
Alien 9620 ISO 18000-6C Passive RFID Tags
2.3 Classification by Packaging Materials
2.3.1 Paper packaged RFID tags
Paper packaged RFID tags are suitable for one-time use and have lower costs.
Application Scenario:
Product tags: used for tracking and inventory management of retail products.
Ticketing system: Electronic tickets for concerts and sports events.
2.3.2 Plastic encapsulated RFID tags
Plastic encapsulated RFID tags have good weather resistance and durability.
Application Scenario:
Industrial manufacturing: used for the management of tools and equipment.
Automotive industry: used for vehicle identification and maintenance records.
2.3.3 Glass encapsulated RFID tags
Glass sealed RFID tags are suitable for high temperature environments.
Application Scenario:
Food processing: used for food traceability and quality control.
Medical equipment: used for tracking equipment that is resistant to high temperature disinfection.
2.4 Classification by Reading and Writing Ability
2.4.1 Read only RFID tags
The data stored in read-only RFID tags cannot be rewritten and is suitable for one-time information recording.
Application Scenario:
Anti counterfeiting label: used for verifying the authenticity of valuable items.
Disposable items: such as drug tracking.
2.4.2 Read write RFID tags
Read write RFID tags can be read and written multiple times by readers, making them suitable for scenarios that require frequent data updates.
Application Scenario:
Asset management: used for tracking and managing enterprise assets.
Smart grid: used for monitoring and maintenance of power equipment.
2.5 Classification by label shape
2.5.1 Standard Credit Card Sizes
RFID tags with standard credit card sizes are suitable for scenarios that require standardized sizes.
Application Scenario:
Identity recognition: used for employee cards and membership cards.
Financial services: used for bank cards and credit cards.
2.5.2 Alien RFID tags
Alien RFID tags can be customized according to the shape of the items that need to be attached, suitable for tracking special items.
Application Scenario:
Clothing industry: used for anti-theft and inventory management of clothing.
Jewelry industry: used for jewelry display and safety management.
2.6 Classification by working temperature
2.6.1 Room temperature RFID tags
Room temperature RFID tags are suitable for normal environmental temperatures.
Application Scenario:
Retail industry: used for inventory management of daily goods.
Logistics industry: used for tracking regular goods.
2.6.2 High temperature RFID tags
High temperature RFID tags are suitable for high-temperature environments.
Application Scenario:
Steel manufacturing: used for tracking and managing high-temperature furnace materials.
Automotive manufacturing: used for component tracking in high-temperature environments.
2.7 Classification by Storage Capacity
2.7.1 Low Capacity RFID Tags
Low capacity RFID tags are suitable for scenarios where a small amount of information is stored.
Application Scenario:
Simple item tracking: such as standard part management in a warehouse.
Disposable: such as exhibition tickets.
2.7.2 High Capacity RFID Tags
High capacity RFID tags are suitable for scenarios that require storing large amounts of data.
Application Scenario:
Complex asset management, such as maintenance records of large equipment.
Medical records: Used for storing detailed medical information of patients.
2.8 Classification by tag function
2.8.1 Standard RFID tags
Standard RFID tags provide basic identification and data storage functions.
Application Scenario:
Logistics management: used for rapid identification and classification of goods.
Inventory counting: used for regular inventory counting.
2.8.2 Multi functional RFID tags
The multifunctional RFID tag integrates sensors such as temperature and humidity, providing more monitoring functions.
Application Scenario:
Cold chain logistics: used for temperature monitoring of food and medicine.
Environmental monitoring: used for temperature and humidity control in warehouse environments.
3.RFID tag types and characteristics
3.1 Classification by power supply method
3.1.1 Active RFID tags
Active RFID tags, also known as active tags, are characterized by built-in battery power and the ability to actively send signals to readers and writers. This type of tag has a long recognition distance and is suitable for scenarios that require remote monitoring and tracking.
Technical Specifications:
Power supply: Built in battery, typically a 3.6V to 3.7V lithium battery.
Working frequency: Customizable, common ones include 433MHz, 2.4GHz, 5.8GHz, etc.
Communication distance: usually over 100 meters, depending on the power of the tag and antenna design.
Data capacity: Large, capable of storing data ranging from several kilobytes to several megabytes.
Environmental adaptability: The temperature resistance range and waterproof and dustproof level of the battery need to be considered.
Application Scenario:
Logistics monitoring: used for real-time location tracking of containers, trucks, etc.
Intelligent transportation: used for vehicle management systems to achieve automatic toll collection and vehicle monitoring.
Asset management: Used for remote monitoring of valuable assets such as art, equipment, etc.
3.1.2 Passive RFID tags
Passive RFID tags, also known as passive tags, rely entirely on electromagnetic waves emitted by the reader/writer for their working energy. This type of label has a lower cost and is suitable for cost sensitive applications.
Technical Specifications:
Power supply: No built-in battery, completely dependent on electromagnetic energy provided by the reader/writer.
Operating frequencies: low frequency (125kHz to 134kHz), high frequency (13.56MHz), and ultra-high frequency (860MHz to 960MHz).
Communication distance: usually within a range of a few centimeters to a few meters, depending on the sensitivity of the tag and the power of the reader/writer.
Data capacity: relatively small, usually ranging from tens to thousands of bytes.
Environmental adaptability: No need to consider battery replacement issues, suitable for various environments.
Application Scenario:
Retail industry: used for inventory management and anti-theft of goods.
Library: an automated management and borrowing system for books.
Medical industry: used for tracking and management of medical devices and drugs.
3.2 Classification by working frequency
3.2.1 Low frequency (LF) RFID tags
Low frequency RFID tags operate in the frequency range of 125kHz to 134kHz and have good penetration and anti-interference properties.
Technical Specifications:
Operating frequency: 125kHz to 134kHz.
Communication distance: generally less than 1 meter.
Data transmission rate: Slow, suitable for simple data transmission.
Environmental adaptability: Suitable for humid and metallic environments.
Application Scenario:
Animal tracking: used for livestock management and wildlife conservation.
Access control system: used for secure access control.
3.2.2 High frequency (HF) RFID tags
High frequency RFID tags operate within the frequency range of 13.56MHz and are suitable for short distance, high-speed data transmission.
Technical Specifications:
Operating frequency: 13.56MHz.
Communication distance: generally less than 1.5 meters.
Data transmission rate: Faster, suitable for complex data transmission.
Environmental adaptability: Suitable for non-metallic environments.
Application Scenario:
Mobile payments: such as bus cards and electronic wallets.
Book management: used for automated management of libraries.
3.2.3 Ultra High Frequency (UHF) RFID Tags
Ultra high frequency RFID tags operate in the frequency range of 860MHz to 960MHz, with a long recognition distance and fast data transmission capability.
Technical Specifications:
Operating frequency: 860MHz to 960MHz.
Communication distance: up to several meters to tens of meters.
Data transmission rate: High speed, suitable for transmitting large amounts of data.
Environmental adaptability: greatly affected by metals and liquids.
Application Scenario:
Warehouse logistics: used for rapid inventory and tracking of large quantities of goods.
Manufacturing automation: used for material management and quality control on production lines.
4.RFID tag technical parameters
4.1 Working frequency and propagation characteristics
The operating frequency of RFID tags is one of their core characteristics, which directly affects the propagation characteristics, recognition distance, and application scenarios of the tags. According to different operating frequencies, RFID tags can be classified into low frequency (LF), high frequency (HF), ultra-high frequency (UHF), and microwave (MW) types.
Low frequency (LF) tag: The operating frequency is between 125kHz and 134kHz, and its main feature is strong penetration ability, which can penetrate substances such as water and metal, but the recognition distance is relatively short, usually not exceeding 1 meter. Low frequency tags are widely used in animal tracking and management.
High frequency (HF) tag: The operating frequency is 13.56MHz, with good resistance to metal and liquid interference, and the recognition distance is generally within 1 meter. High frequency tags are widely used in fields such as electronic payments, identity verification, and library management.
Ultra high frequency (UHF) tag: Operating at frequencies between 860MHz and 960MHz, it has a long recognition distance and fast data transmission capability, generally reaching several meters to tens of meters. UHF tags have a wide range of applications in warehousing, logistics, and manufacturing automation.
Microwave (MW) tags operate at frequencies of 2.45GHz and 5.8GHz, with longer recognition distances and higher data transmission rates, but are more sensitive to the environment, especially with greater attenuation to water. Microwave tags are suitable for scenarios such as luggage tracking and item management.
4.2 Recognition distance and speed
Identification distance: The identification distance of RFID tags is influenced by various factors, including the configuration of the tag and reader, antenna operating frequency, and the transmission power of the reader. The recognition distance of passive tags is usually shorter, while active tags can achieve a longer recognition distance due to their built-in power supply.
Recognition speed: The recognition speed of an RFID system determines its processing capability in a multi tag environment. The high-speed recognition capability enables RFID systems to quickly process a large number of tags in logistics and supply chain management, improving operational efficiency.
4.3 Data storage capacity
Low capacity tags: typically used to store simple identification information such as serial numbers, timestamps, etc., with storage capacities ranging from tens to hundreds of bytes.
Medium capacity label: suitable for scenarios that require storing more information, such as product descriptions, batch numbers, etc., with a storage capacity of up to several kilobytes.
High capacity tags: suitable for scenarios that store large amounts of data, such as video surveillance, complex asset management, etc., with storage capacity up to several megabytes.
4.4 Data transmission rate
The data transmission rate is the speed at which RFID systems transmit data, which directly affects the real-time and accuracy of the data.
Low frequency (LF) tag: Slow data transmission rate, suitable for low-speed, close range recognition applications.
High frequency (HF) tag: The data transmission rate is relatively fast, usually above 100kbps, suitable for complex data transmission.
Ultra high frequency (UHF) tag: With high data transmission speed, it is suitable for fast processing of large amounts of data and can generally reach around 100kbps.
5.RFID tag packaging material and shape
5.1 Paper packaging
Paper packaged RFID tags have been widely used in retail, ticketing, and library management due to their low cost and ease of mass production. Paper labels are usually in the form of adhesive stickers, with pre coated adhesive on the back for easy attachment to various surfaces of items.
Technical Specifications:
Material: Paper substrate, suitable for disposable and short-term applications.
Weather resistance: Poor, not suitable for outdoor use or long-term exposure to humid environments.
Processing technology: Usually, after printing antenna patterns, they are assembled with chips and antenna coils, and finally die cut.
Cost: Low, suitable for large-scale deployment.
Application Scenario:
Retail product label: used for inventory management and anti-theft of goods.
Book management: used for tracking and borrowing management of books in libraries.
5.2 Plastic packaging
Plastic encapsulated RFID tags have good weather resistance and durability, making them suitable for industrial and outdoor environments. Plastic labels can take on various forms, such as credit card shapes, shaped tags, or hang tags.
Technical Specifications:
Materials: PVC, PET and other plastic materials, with good chemical corrosion resistance and wear resistance.
Weather resistance: Strong, suitable for outdoor use and long-term exposure to various environments.
Processing technology: It can be formed through injection molding, hot pressing, and other methods, and assembled with chips and antenna coils.
Cost: Medium, suitable for applications that require a certain level of durability.
Application Scenario:
Industrial manufacturing: used for the management of tools and equipment, as well as material tracking on production lines.
Automotive industry: used for vehicle identification and maintenance records.
5.3 Glass encapsulation
Glass encapsulated RFID tags are suitable for use in high-temperature environments, such as food processing and medical equipment disinfection. Glass labels are commonly used in applications that require frequent high-temperature disinfection due to their high temperature resistance.
Technical Specifications:
Material: Glass substrate, with extremely high heat resistance and chemical stability.
Weather resistance: extremely strong, able to maintain stable performance even at extreme temperatures.
Processing technology: Glass packaging technology is complex and costly, usually requiring special equipment for packaging.
Cost: High, but suitable for specific industries due to its high temperature resistance.
Application Scenario:
Food processing: used for food traceability and quality control, especially in high-temperature disinfection environments.
Medical equipment: used for tracking and managing medical equipment that is resistant to high temperature disinfection.
6.Analysis of RFID tag application scenarios
6.1 Logistics and Supply Chain Management
In the field of logistics and supply chain management, the application of RFID technology can significantly improve the efficiency and accuracy of cargo tracking. By attaching RFID tags to the goods, real-time monitoring and automated management of the goods can be achieved.
Technical application:
Tag type: Ultra high frequency (UHF) RFID tags are commonly used, as they have a long recognition distance and are suitable for fast reading of large quantities of goods.
Reader deployment: Deploy fixed RFID readers at warehouse entrances, exits, and key logistics nodes to achieve automatic tracking of goods.
Data processing: Real time processing of read data through integrated information systems to optimize inventory management and improve logistics efficiency.
6.2 Application of RFID Technology in Retail Inventory Management
The application of RFID technology in retail inventory management can greatly improve the efficiency and accuracy of inventory management. By equipping products with RFID tags, retailers can monitor the storage and flow of goods in real time, improve inventory management efficiency, reduce manual errors, and effectively prevent theft.
Technical application:
Tag type: Ultra high frequency (UHF) RFID tags are commonly used, as they have a long recognition distance and are suitable for fast reading of large quantities of goods.
Reader deployment: Deploy fixed RFID readers at warehouse entrances, exits, and key logistics nodes to achieve automatic tracking and management of goods.
Data processing: Real time processing of read data through integrated information systems to optimize inventory management and improve logistics efficiency.
6.3 Application of RFID Technology in Inventory Management in the Manufacturing Industry
In the manufacturing industry, RFID technology can achieve automated control and information traceability of the production process, improving production efficiency and product quality. By attaching RFID tags to products, manufacturing companies can obtain real-time information on the production progress, quality, and other aspects of the product, ensuring the correctness and efficiency of the production process.
Technical application:
Tag type: Depending on the production environment and requirements, high-frequency (HF) or ultra-high frequency (UHF) RFID tags may be used.
Reader deployment: Deploy RFID readers at critical stages of the production line to track the flow of materials and products.
Data processing: The data collected through RFID systems can be used for production scheduling, quality control, and maintenance planning.
6.4 Application of RFID Technology in the Field of Intelligent Transportation
The application of RFID technology in the field of intelligent transportation is significant, which can achieve automatic identification and unique identification of vehicles. It has a wide range of applications in vehicle entry and exit management, vehicle automatic weighing systems, and parking lot RFID charging. In addition, RFID technology can also be applied to scenarios such as non-stop toll collection on highways and vehicle anti-theft systems, improving traffic operation efficiency and reducing traffic congestion.
Technical application:
Tag type: Microwave (MW) RFID tags are commonly used, as their long-range identification capability is suitable for traffic monitoring.
Reader deployment: Deploy RFID readers at traffic arteries, toll stations, and parking lots to achieve automatic management and toll collection of vehicles.
Data processing: The data collected through RFID systems can be used for traffic flow analysis, vehicle management, and safety monitoring.
6.5 Application of RFID Technology in the Healthcare Sector
The application of RFID technology in the healthcare field has brought revolutionary changes to patient management and medical equipment management. By wearing RFID tags, patients can be quickly and accurately identified and confirmed by medical staff, improving patient safety. At the same time, RFID technology can also be used for tracking and managing drugs to prevent misdelivery and expired use of drugs. RFID tags can be attached to medical equipment, and real-time device information can be obtained through readers, improving equipment management efficiency, reducing equipment loss, improving equipment utilization, and reducing operating costs.
Technical application:
Tag type: High frequency (HF) or ultra-high frequency (UHF) RFID tags are typically used to meet the needs of medical environments.
Reader deployment: Deploy RFID readers at hospital entrances, wards, and critical medical areas to achieve real-time monitoring of patients and devices.
Data processing: The data collected through RFID systems can be used for patient care, equipment management, and drug tracking.