UHF transponders operate on the 860 to 960 mHz frequency. They provide greater read range and are generally lower cost than HF transponders.  UHF transponders operate on a backscatter principle and reflect the RF signal from the transceiver back to it. 
UHF transponders are generally a dipole antenna printed in one step with Parmod® inks. The IC chip is usually attached in the center.  Chip attachment may be by ‘pick and place’ using a conductive adhesive or using a strap attachment process where the chip has been mounted on a small substrate with connecting leads and the ends of the strap are attached to the antenna as shown below:

UHF transponders are newer than HF, their use being driven by the large retailers and Department of Defense who are looking for low cost and read distances of 10-30 meters. The bandwidth of the frequency, which ranges from 860- to 960 mHz varies from region to region around the world. The U.S. has specified 915 mHz, while the European Union has specific 868 mHz and Japan is considering the 950-956 mHz band.  EPCglobal, a standards organization, is working with governments to harmonize UHF frequencies and is making good progress, although China has not yet published a UHF RFID standard. This variation in frequency allocation requires that manufacturers produce country- or region-specific tags and readers, causing a potential disconnect for companies attempting to create a seamless international supply chain.
In Europe, there is also a power restriction of 500 mW and a bandwidth restriction that results in an inability to frequency-hop the reader and also imposes a limitation on the tag anti-collision arbitration speed. The power restriction impairs the achievable reading distance, and the lack of frequency hopping means tag visibility and reading robustness are not optimum. Changes in European regulations are expected to permit reader power in the 869-mHz band of 2 watts.
UHF transponders are anticipated to dominate the supply chain and retail distribution applications over the next several years.