What are RFID Tags?: 3 Things to Know About UHF RFID Tags
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- เผยแพร่เมื่อ 1 ส.ค. 2013
- In this video, you'll learn about the basic components in a basic RFID system. Then, we'll outline three things you need to know about RFID tags.
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Thanks a lot! Superior and on the spot explanation of RFID components
aretz Thank you so much for the kind words! If you are interested in additional information on RFID, please check out our Resources page: www.atlasrfidstore.com/rfid-resources/
thxs for the sharing
whats the storage capacity of rfid
The memory capacity varies depending on the integrated circuit, or chip. Some RFID tags have just enough memory to cover the basics required by the Gen 2 standard (96 to 128 bits) while some high-memory chips can store up to 32,000 bits or more. Of course, higher memory means a higher price.
Below are some articles that provide more insight on the topic:
blog.atlasrfidstore.com/17-things-might-not-know-gen-2-rfid-tag-memory-banks
blog.atlasrfidstore.com/high-memory-rfid-tags-and-which-applications-need-them
blog.atlasrfidstore.com/types-of-memory-in-gen-2-uhf-rfid-tags
Must a tag move through the terminal’s electronic field
to get power and communicate?
Or can a ‘shielded’ tag be in close proximity and then be
un-shielded when not moving and communicate?
In order for a passive RFID tag to communicate, it must first receive energy in the form of RF radiation, or waves, before it can respond. Because passive RFID tags are powered by RF waves, they do need to be within range of a compatible RFID system in order to send a signal. The distance will vary greatly depending on the frequency of the system as well as the system setup (e.g. antenna gain, reader transmit power, etc.).
To specifically address your questions above:
Yes, the passive RFID tag will need to be within the given antenna's electromagnetic field in order to respond.
Yes, if a passive RFID tag is properly shielded, it can be within the antenna's field (including close proximity) and then begin to respond when the shielding is removed (as long as it is still within the antenna's field and as long as the antenna is actively transmitting).
For more information on how energy flows in an RFID system, please see the following article:
blog.atlasrfidstore.com/rf-physics
Also, of note, active RFID tags (i.e. battery powered) do not require RF radiation to power them and will transmit regardless of the other components of the RFID system (if programmed to do so).
excellent presantation but please tell me something. How can someone store the data needed in the tag? is there USB connectivity for example (unlikely) or wirelessly storage of data?
To store data on the tag, you'll also need an RFID reader (which is also a writer/encoder; various examples can be seen here: www.atlasrfidstore.com/rfid-readers/). Using the RFID reader, you can communicate wirelessly with the RFID tag and write information to the tag's chip. The amount of information you can store on a typical UHF RFID tag is relatively small; however, there are some high memory tags.
For more information on UHF tag memory, please see the following three articles:
blog.atlasrfidstore.com/types-of-memory-in-gen-2-uhf-rfid-tags
blog.atlasrfidstore.com/high-memory-rfid-tags-and-which-applications-need-them
blog.atlasrfidstore.com/17-things-might-not-know-gen-2-rfid-tag-memory-banks
Atlas RFID Store You've been really helpful. thanks
I wonder about RFID's serial code which inserted into the cards. Is that code has difference in any individual card around the world? Thank you for your information before.
Thank you for your question, but I'm not sure I understand exactly what you are asking. If you are asking about the uniqueness of RFID tag IDs, then every UHF Gen2 tag does have a unique TID number that is programmed by the manufacturer at the factory. However, that doesn't mean that each EPC memory block will necessarily be unique; that depends on how the user decides to encode the EPC memory bank.
For more information on memory in UHF Gen2 tags, please see the following articles:
blog.atlasrfidstore.com/types-of-memory-in-gen-2-uhf-rfid-tags
blog.atlasrfidstore.com/encoding-rfid-tags-3-things-to-know
blog.atlasrfidstore.com/17-things-might-not-know-gen-2-rfid-tag-memory-banks
Is the cost of a fabrication of an RFI expensive? What are the main components of a reader RFID?
If you are referring to the cost of fabricating an RFID reader, it depends on how robust you make the reader in terms of added features as well as the encasement. In short, the more you add, the more expensive it will be.
There are some relatively low cost RFID reader modules on the market (for example: www.atlasrfidstore.com/thingmagic-nano-embedded-rfid-reader-module/); this is one example of what you would use as a base for any reader you create.
However, if you are starting from scratch, you would begin with a reader module development kit. Some examples can be found here: www.atlasrfidstore.com/rfid-reader-module-dev-kit/.
More information on the basic options and features of RFID readers can be found here: blog.atlasrfidstore.com/rfid-readers-basic-options-features
got 2 questions:
1. Is it possible to have a automatic writter system that writes the information you need to your tags when the tag pass in front a scanner by example?
im asking this because i am secondly wondering if it could be possible to write the current date and time of the day in your tag for your production tracibilty? since the time of your day change every minutes, i was wondering if this application exist or could be possible.
thanks
Marc-Olivier,
Actually, yes this is possible! Using the ThingMagic Elara RFID Reader, you can encode a memory bank once an RFID tag is in the reader's field. This reader can report the date/time of each encode via an autonomous workflow called Tag Update, within the software - ThingMagic Configuration Tool. It looks like there actually is a setting within that workflow called "Write Timestamp" which would make it much simpler to do this. You might still need some type of custom software depending on your setup and the problem you are trying to solve.
This is a super cool feature of the ThingMagic Elara which is pretty cost efficient as well, we might have to a demo of this in the future - thanks for the great question!
www.atlasrfidstore.com/thingmagic-elara-usb-rfid-reader/
Thanks for this great and informative video explaining about RFID. Completely new to this field, but I got interested in RFID through a start-up that is using RFID tags with blockchain to manage logistics/warehousing of apparel industry. The company wants to apply RFID tag to each clothing to be able to track everything. At the current state of development, is RFID cheap enough to apply on each clothing, and furthermore, secure/powerful enough to find a specific clothing in a pile of thousands of clothing? Thanks! PS Link to the company's white paper www.waltonchain.org/upload/1498826072890.pdf
There are many different companies that are currently applying RFID tags on to individual pieces of clothing. Here's a blog that we put together that discusses the tagging of individual clothing items in a retail setting.
blog.atlasrfidstore.com/auburn-rfid-lab-part-1-retail-environment
The price per tag will depend on the requirements of your specific application. However, if you are considering moving forward with a 13.56 Mhz tag, your tag cost will be a bit higher and it will be much more difficult to read large groups of tags at one time.
HF/NFC tags have very limited read range of less than a foot, so it would be difficult to have a large quantity of tagged items within this range. However, with UHF (860-960 Mhz), you can pick up clothing tags from 10-20 feet away. This will allow you to have many more pieces of clothing within a reader's area coverage.
Thanks Timothy!
Again reader needs to be uhf reader for uhf tags or not
Yes, UHF Readers have to be used with UHF RFID Tags. The readers and tags must match frequency ranges.