There are different types of RFID tags.
There are HF band and UHF band classified by frequency, and the differences are below.
Tag for HF band (13.56MHz) is using the coiled loops antenna in general.
The similar antenna is used for the Reader/Writer, too.
The feature of this type of antenna is that the energy efficiency is relatively high but it’s communication distance is shorter.
One of the HF band RFID is prepaid transportation IC cards which is well known.
Whereas, in UHF-band(900MHz) tag, dipole antenna is used for in general and patch antenna is used for reader/writer.
Although dipoles antenna has the directivity, it has the advantage of the long communication distance.
Since patch antenna’s directivity is smaller, it is compensated by combining with tag that has the dipole antenna so that the tag communication can be made from various angle.
Also based on with or without a battery, there are passive, active, and semi-active types.
Based on tag shape or form, in-lay, label, hard, ceramic, the one can be attached to metal, and etc, each tag type has different size and features, so when they are implemented, be ware which one is the best fit for the purpose.
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