How Does a UHF RFID Tag Work? Click to Learn The Complete Guide


Do you know for what UHF stands? Well, it stands for Ultra High Frequency, whereas, the RFID stands for; Radio frequency identification. The rate of UHF ranges from 300 MHz to 1 GHz. On other hand, RFID systems that operate within this frequency band are known as Ultra High Frequency (UHF) RFID Systems.

Now, if we consider the complete term together, then UHF RFID tags contain a higher read range, as compared to LF tags and HF

 How does a UHF RFID System Work?

The RFID reader produces radio waves of particular frequencies via RFID antennas. These waves “give energy” to tags to make them communicate by releasing a unique ID. I don’t need batteries, and can be used for a decade

Next, the reader processes data so you can incorporate them into your application and make it meaningful.  The classic reading range is 0-12 meters. The Gen2 UHF RFID systems comprise antennas, printers, readers, and RFID tags or labels.


As far as the RFID Antennas are concerned, so they’re usually supposed to emit and receive waves that let us detect RFID chips. When an RFID chip crosses an antenna field, it gets activated and releases a signal. These antennas make different wavefields and cover altered distances.

Antenna Type: Here are three types of antennas;

  • The Circular polarization antennas work best at those places where the direction of the tag varies
  • The linear polarization antennas are used when tags direction is known, controlled, and stays the same
  • Near Field – NF – antennas are used for reading RFID tags within a few centimeters

Overcast Angle & Gain: Using antennas with gains around 8.5-10 dbi or above enables releasing high power, and attain a higher reading ratio. The opening angle depends on the area to be covered, or an instance: 70 °, 100 °, etc. The higher proposition any antenna would have, the less detection distance will be

Number of Antennas: The standard high-performance readers are usually given 2 ports, 4 ports, or 8 ports. How many antennas should there be, this thing is usually chosen on grounds of reading space you need to detect or the density of tags that needs to read. The frequently used is 2 or 4 port fixed readers. Some UHF RFID tag manufacturer brands also provide multiplexers that allow connecting up to 32 antennas within the same reader.

Leave Your Comments