October 01, 2005
Small-sized UHF tags
UHF tags have gained popularity as the preferred tag for case- and pallet-level tagging. In fact, countries such as Korea and Japan have even changed their radiation-related regulations to facilitate implementation of UHF tags. Companies such as Wal-Mart, Albertsons, Tesco, Metro, have specified UHF tags for pallets and cases to the related EPC conventions. Most companies would prefer to use a single frequency for both item-level and pallet-level tagging. This would save them the trouble of managing a multiprotocol and multifrequency system.
Reading tags at the case level frequently involves line-of-sight, if not; the obstructions are of a type that UHF frequencies can tolerate, for example, wood and plastic. Item-level tagging has to be carried out in the presence of water and metals leading to problems with absorption and reflection of the electromagnetic radiation. Multiple tags on a product are an option but a very costly one. The problem related to the large size of UHF tags was solved by Matrics which produced a tag with dimensions 2.5 cm X 3 cm and a range of 30-90 cm. idtechex.com reports:
Curiously, no one seems to be using fractal antennas designed by the company of that name despite these being small at UHF - even fitting in a bottle top. Either way, the new tags are no bigger than 13.56MHz ones of similar range.
Read More: Ultra Small UHF Tags
--
Did you enjoy this post?
