Depending on the power supply method, RFID tags can be divided into two categories: active RFID tags and passive RFID tags. Understanding the working principles, characteristics and application scenarios of these two tags is crucial for enterprises to choose the type of tags that best suits their needs.
What are active RFID tags?
An active RFID tag is a wireless identification device with a built-in power source. They rely on the internal battery to actively send signals and are usually used in application scenarios that require long-distance reading.
Working Principle
Active RFID tags contain batteries inside, which allows them to actively transmit radio signals. The tag will continuously broadcast its own information, or activate and send data when it detects a reader signal. This active communication method allows the reading range of active RFID tags to reach hundreds of meters, and even in some special cases, the reading range can reach thousands of meters.
Features
First, the reading distance of active RFID tags is longer. Because its internal battery provides continuous power support, the tag can achieve a longer distance of signal transmission, which is very suitable for applications that require wide-area monitoring, such as fleet management and remote asset monitoring. Secondly, these tags usually have a larger data storage capacity and can record a large amount of data information, including historical records and environmental data. Third, because of the built-in battery and more complex circuit design, the cost of active RFID tags is usually higher. In addition, the battery life is limited and requires regular maintenance or replacement, which increases the cost of use. Finally, due to the presence of batteries, active RFID tags are usually larger than passive RFID tags, so they are not suitable for scenarios with strict requirements on volume or weight.
Application Scenarios
Active RFID tags are often used in scenarios that require long-distance monitoring. For example, in supply chain management, these tags can track the location of goods in real time to ensure transparency during transportation. In fleet management, they can be used to track the location and status of vehicles. In remote equipment status monitoring, these tags can provide accurate real-time data to help companies with maintenance and management.
What are passive RFID tags?
Passive RFID tags are the most common type of RFID tags, named because they do not contain batteries and rely on external readers to provide energy.
Working Principle
Passive RFID tags obtain energy through the electromagnetic field emitted by the reader. When the reader sends a signal, the tag antenna captures the electromagnetic energy and converts it into electricity to activate the chip inside the tag. The chip uses this energy to process and send data back to the reader. Due to the limited energy source, the signal transmission distance of passive RFID tags is usually short, and the read range is usually between a few centimeters and a few meters, depending on the frequency and tag design.
Features
Passive RFID tags are low-cost. Due to the lack of batteries and complex circuit design, their production cost is much lower than that of active RFID tags, which makes them very suitable for large-scale deployment. Secondly, passive RFID tags are very small and can be as thin as paper, which is suitable for applications with strict requirements on size and weight, such as product packaging and document management. Thirdly, because passive RFID tags lack a battery, they typically last a long time and can be used for decades without needing a battery replacement. Finally, passive RFID tags have a short read range and are suitable for close-range identification tasks.
Application scenarios
Passive RFID tags find extensive use in inventory management, retail anti-theft, and access control. Retailers employ passive RFID tags for inventory management and anti-theft systems due to their low cost and durability, making them ideal for high-frequency use. Additionally, access control systems use these tags to regulate personnel entry and exit, enhancing the security of the premises. At the same time, they are also suitable for close-range identification applications such as document tracking and small asset management.
How to choose RFID Tags that suit your needs?
Before deciding which RFID tags to choose, companies need to clarify their business needs and application scenarios. Here are some key considerations:
Reading distance
The first thing companies need to consider is whether the application scenario requires long-range reading. If your business involves wide-area asset tracking or remote logistics management, active RFID tags may be more suitable because they can provide a reading range of hundreds of meters or even farther. On the contrary, if you need close-range identification, passive RFID tags provide a more economical choice and meet short-range reading requirements.
Cost considerations
The high cost and maintenance expenses of active RFID tags may not be suitable for all companies, especially when deployed on a large scale. Companies need to evaluate their budgets and determine whether they can afford the cost of active RFID tags. If the enterprise is cost-sensitive, then passive RFID tags will be a better choice due to their low cost and high durability.
Application environment
Different environmental conditions will affect the performance of RFID tags. For example, metal or liquid environments may interfere with RFID signals. Enterprises should choose the appropriate tag type according to the specific environment and consider using anti-interference tags designed specifically for these environments to ensure stable reading results.
Data storage requirements
Enterprises also need to consider the data storage requirements of the tag. If you need to store a large amount of data, such as equipment status and environmental conditions, active RFID tags will meet these needs with their larger storage capacity and flexibility. Passive RFID tags can usually only store basic identification information and are suitable for application scenarios with less data requirements.
In the process of selecting RFID tags, enterprises must fully consider their business needs, application scenarios and budgets. Active RFID tags and passive RFID tags each have their own advantages and disadvantages and are suitable for different usage scenarios. By deeply understanding the working principles and characteristics of these two tags, enterprises can choose the most suitable RFID tags to improve operational efficiency and ensure the maximum return on investment.
FAQs about RFID tags
- What is the battery life of active RFID tags?
This depends on the frequency of use and the working environment of the tag, usually between 3 and 5 years.
- Can passive RFID tags be used in metal or liquid environments?
Passive RFID tags can experience performance issues in metal and liquid environments. To address this, the market offers anti-interference tags specifically designed for these conditions, which reduce signal interference and ensure stable reading. For example, the Heat Resistant Alien Higgs® 3 PPS RFID On-Metal Tag, with its special structure, has good anti-metal performance, and its reading distance on metal can reach 2.6 meters.
- Is the reading distance of RFID tags fixed?
Many factors affect the reading distance of RFID tags, including the tag type, frequency, reader power, antenna design, and usage environment. Active RFID tags can usually reach a reading range of hundreds of meters, while the reading range of passive RFID tags is generally between a few centimeters and a few meters.
