What is the difference between active and passive RFID?
Active RFID (Radio Frequency Identification) and passive RFID are two different technologies used for tracking and identifying objects or individuals using radio waves. Here's a brief comparison:
1. Power Source:
Active RFID: Active RFID tags have their own power source (battery) and actively transmit signals to the reader. Passive RFID: Passive RFID tags do not have their own power source; they are powered by the electromagnetic energy transmitted from the RFID reader.
2. Range:
Active RFID: Generally have a longer range compared to passive RFID tags, sometimes up to several hundred meters. Passive RFID: Have a shorter range, typically up to a few meters, depending on the frequency and the power of the RFID reader.
3. Cost:
Active RFID: Typically more expensive due to the added cost of the battery and circuitry.
Passive RFID: Generally less expensive since they don't require a battery.
4. Size:
Active RFID: Larger in size compared to passive RFID tags, as they need space for the battery and circuitry. Passive RFID: Smaller and thinner since they don't have a battery.
5. Read/Write Capability:
Active RFID: Can often be read from and written to, allowing for more dynamic data storage and retrieval. Passive RFID: Usually read-only, meaning the data encoded on the tag cannot be changed after manufacturing.
6. Lifespan:
Active RFID: Typically have a longer lifespan due to the battery, which can be replaced or recharged. Passive RFID: Lifespan is generally limited by the material and construction of the tag.
7. Applications:
Active RFID: Often used in applications where longer range and real-time tracking are required, such as vehicle tracking, asset management, and logistics. Passive RFID: Commonly used in applications like access control, inventory management, and tracking of retail items.
In summary, active RFID tags are powered and transmit signals independently, usually over longer distances, whereas passive RFID tags rely on the energy from the reader and have a shorter range. Each technology has its own advantages and is chosen based on the specific requirements of the application.
