|Home||Internet of Things||Aerospace||Apparel||Energy||Defense||Health Care||Logistics||Manufacturing||Retail|
Ask The Experts Forum
From What Distance Can High-Frequency Tags Be Read?
And how do the tags communicate with an RFID reader?
High-frequency (HF) tags communicate with a reader using something called inductive coupling. While ultrahigh-frequency (UHF) tags reflect back a signal using backscatter, HF tags have a coiled antenna that forms an electromagnetic field with an HF reader's coiled antenna. Changes in this field enable the tag and interrogator to communicate. The sizes of the coils in the reader and the tag influence read range, so a very tiny tag with a small coil, for example, would reduce the range. If you have a very large reader antenna, then that can increase the read range—but generally speaking, HF tags operate within 3 feet of a reader antenna.
—Mark Roberti, Founder and Editor, RFID Journal
Login and post your comment!
Not a member?
Signup for an account now to access all of the features of RFIDJournal.com!
SEND IT YOUR WAY
RFID JOURNAL EVENTS
ASK THE EXPERTS
Simply enter a question for our experts.