活跃的RFID系统使用battery-powered RFID tags that continuously broadcast their own signal. Active RFID tags are commonly used as to accurately track the real-time location of assets or in high-speed environments such as tolling. Active tags provide a much longer read range than passive tags, but they are also much more expensive.

There are two main frequencies used by active RFID systems – 433 MHz and 2.45 GHz. User preference, tag selection, or environmental considerations usually dictate which frequency to use for most applications. Companies generally favor RFID systems that operate on the 433 MHz because it has a longer wavelength enabling it to work a little better with non-RF friendly materials like metal and water.

Active RFID systems have three essential parts – a reader or interrogator, antenna, and a tag. Active RFID tags possess their own power source – an internal battery that enables them to have extremely long read ranges as well as large memory banks.

Typically, active RFID tags are powered by a battery that will last between 3 - 5 years, but when the battery fails, the active tag will need to be replaced. As the active tag market matures, replaceable batteries will be a cost saving option. The system’s functionality depends entirely on the type of tag chosen for the application.

负责风化环境conditi严厉ons such as extreme temperatures and moisture, most active RFID tags are encased in a rugged shell. Because of the size of the enclosed battery, circuitry, and bulk of a durable exterior, active RFID tags are usually much larger than passive tags. Also, some active tags may have on-board sensors that track environmental parameters. These sensors can track moisture levels, temperature, and other key identifiers that a company can use for their application. Given the required investment of an active RFID system, active tags are usually reserved for tracking high worth assets or for items where accurate location tracking is necessary to the success of the system. A few examples of these type of assets are pipes, cargo containers, and machinery.

While new applications for active RFID systems appear daily, these systems are usually used in the oil and gas industry, shipping and logistics, construction, mining, and high-value manufacturing.

Pros of Active RFID Tags:

Extremely Long Read Range

Increased tag abilities with partnered technologies (GPS, sensors, etc.)

Extremely Rugged tag option