What are RFID Tags? How RFID Tags Work?

RFID tags are a form of tracking device that identifies goods using smart barcodes. RFID stands for “radio frequency identification,” and RFID tags rely on radio frequency technology to function. These radio waves carry information from the tag to a reader, which subsequently sends it to an RFID computer software. RFID tags are often used for tracking items, but they may also be used to track automobiles, pets, and even Alzheimer’s sufferers. An RFID tag is frequently referred to as an RFID chip.

An antenna and a microchip — also known as an integrated circuit or IC — are used to send and receive data on an RFID tag. An RFID reader’s microchip is programmed with any information the user desires.

There are two main types of RFID Tags:

Batteries are used, and it is a passive device. Battery-operated RFID tags, as the name implies, include an inbuilt battery for power, whereas passive RFID tags do not, instead of relying on electromagnetic energy sent by an RFID reader. Active RFID tags are RFID tags that are powered by batteries.

Passive RFID tags transmit data using three basic frequencies: 125–134 KHz (also known as Low Frequency (LF)), 13.56 MHz (also known as High Frequency (HF) and Near-Field Communication (NFC), and 865–960 MHz (commonly known as Ultra High Frequency (UHF)) (UHF). The tag’s range is affected by the frequency utilized.

When a reader scans a passive RFID tag, the reader sends energy to the tag, which activates the chip and antenna, allowing the tag to broadcast information back to the reader. After that, the reader sends the data to an RFID computer software, which interprets it. Inlays and hard tags are the two major forms of passive RFID tags. Hard tags, on the other hand, are composed of a hard, durable substance such as plastic or metal, whereas inlays are often relatively thin and may be pasted on a variety of surfaces.

One of two Major Frequencies is used by Active RFID Tags.

They are made up of three primary components: a tag, an antenna, and an interrogator. An operational RFID tag’s battery should provide enough power to survive for 3-5 years. Because the batteries are not currently removable, the device will need to be replaced when it dies. Beacons and transponders are the two types of active RFID tags. 

Every few seconds, beacons send out an information ping, and their signal can be received from hundreds of feet away. Because they communicate data so regularly, their batteries tend to run out faster. Transponders, like passive RFID tags, need the usage of a reader to send data. When the reader and the transponder are within range of each other, the reader transmits a signal to the transponder, which subsequently pings back with the required information. Transponders are substantially more battery-efficient than beacons, since they only operate when they are near a reader.


Suraj Informatics is a global leader in the development and manufacture of high-performance RFID tags that are customized to meet the needs of customers.

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