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Ultra- High Frequency (UHF)
- Apr 21, 2017 -

Ultra- High Frequency (UHF)

· Frequency: 400 – 1000 MHz – generally, 860 – 960 MHz

· Read Range: Up to 35 m (115 ft.) under ideal conditions

· Coupling Technique: Backscatter coupling – reader’s antenna generates RF energy to activate the RFID tag, which modulates the information and reflects the remaining energy back to the reader antenna.

· Antenna Design: Typically, dipole-shaped tag antenna

· Near-Field Capabilities: If it has a small loop-shaped antenna in the middle, it usually has near-field capabilities.

 

UHF Structure & Materials

Most UHF tag antennas are designed with a dipole-type structure. This means they generally are long and thin visually, and operate similar to a magnet. The similarity is apparent because they have two ‘open’ ends, or poles, for the energy to build up and, consequently, allow a current flow to the Integrated Circuit (IC), or chip.

The most well-known RFID tags on the market that are not structured like a typical dipole antenna are tags similar to the SMARTRAC Frog and the Alien Spider. These tags are square-shaped in order to best display their omni-directional properties and are sometimes called “dual-dipole” tags.

Tag antennas are made from a metal wire or metallic sheet in order to provide an adequate conductor for the RF energy. Then, depending on the type of tag, other types of materials like PET, plastic, paper, and polyester are used to provide the base around the tag antenna.

 


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