UHF versus HF and LF.
The Ultra-High frequency (UHF) passive technology utilized by Omni-ID's RFID solutions offers several advantages to existing High frequency (HF) and Low frequency (LF) passive options. Simply stated, UHF-based tags provide greater read distances, faster data rates, and are more cost-effective in comparison to both HF- and LF-based tags.
Omni-ID's technology represents a revolutionary new approach to RFID tag design. By capturing incoming RF waves and isolating them from their surrounding materials, Omni-ID's technology provides complete immunity from any backing material—including metals and liquids. Unlike a traditional RFID tag, that uses a conventional dipole-based antenna, an Omni-ID RFID tag will work when attached to any item, regardless of its manufacturing material and contents.
This design differs dramatically from the traditional approach for mounting RFID tags on metals. The traditional solution typically reduces the effects of interfering backing materials with a "spacer" made from high air-content material, such as foam. Spacers are typically 10mm thick or more. They increase a tag's cost, yet are often unreliable.
In contrast, an Omni-ID UHF RFID tag does not need to isolate the antenna with a spacer. Omni-ID's technology instead captures RF waves within a dielectric core sandwiched between two layers that prevent the waves from "seeing" the what is beneath the tag. As a result, the tag keeps working no matter what material it is placed on.
©2008 Omni-ID Cayman, Ltd. All rights reserved.