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3 Things to Know About UHF RFID Tags

Views:4     Author:Site Editor     Publish Time: 2018-03-21      Origin:Site

In every UHF RFID system, there are four basic components:

  1. RFID Reader  2. Cable  3. Antenna  4. RFID Tag


Of all these components, the RFID tag varies the most and significantly impacts the overall success of the system. Form factors, price ranges, read ranges, attachment methods, etc. can make finding the best tag for the job a little daunting. When selecting the right RFID tag for your system, we have identified some core differences between UHF tags.


Three important component differences among RFID Tags:


1. IC Type

The IC (Integrated Circuit) is the brain of the RFID tag and stores the unique information on the tag. Some IC types can store more information than others. Generally speaking, most UHF RFID tags adhere to the Class 1 Generation 2 standard (ISO 18000-6C) and use 96 bits of memory to store the EPC (Electronic Product Code). This is enough space to store 24 hexadecimal characters (0-9, A-F). However, some tags are more expensive because they have extended user memory to store more information on the RFID tag.


2. Antenna

For general purposes, the size of the tag's internal antenna will be a strong indicator of the tag’s read range. Small RFID tags contain small antennas which leads to shorter read ranges, while large RFID tags (with larger antennas) will have longer read ranges. Additionally, RFID antennas can be strongly influenced by their surrounding environment. Water and metal absorb and reflect RF energy respectively and, in doing so, may decrease an RFID system's performance (read ranges and read rates). However, the properties of metal can be used as an advantage if the correct tag is used.


On metal RFID tags, which have special backings, leverage their metallic surroundings to harness reflected energy and increase read ranges. Background insensitive tags have foam material around the antenna so that the they can be placed both on and off metal. An additional factor regarding tag antennas that affects how they act in an RFID system is the number of dipoles the tag contains. In short, a dual dipole RFID tag will be readable from more orientations, where as a single dipole RFID tag may need to be read in a more controlled orientation. If you’d like to know more about what affects read range in an RFID system, please see our post about factors that affect RFID read range.


3. Encasement

When we're referring to encasement, we're talking about the physical form factor of the RFID tag. Depending on the application, RFID tags come in a variety of shapes and sizes.


The most basic delivery of a RFID tag is the RFID inlay. The inlay provides the RF functionality of any RFID tag, but only contains the IC and antenna. RFID inlays can be wet, which signifies that they have adhesive on their backs, or dry, which means they contain no adhesive.


Weclome to consult for the UHF tag by any time.


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