Thanks! This will help with my Arduino project to play the Imperial March whenever my boss walks up to my cubicle (he always has his RFID card around his neck).
Im working on an RFID alarm system for our university, many people just casually walk out with books from our small technical library... One interesting thing I saw is a product called iD top from Nedap, it is an overhead RFID reader/security device. One interesting aspect it has is beam steering, which stops false alarms (only sounds when tags are moving, and in a particular direction). I wonder how hard would it be to build something similar? Does it require special antennas? Special receiver?
One of the latest techniques is for manufacturers to incorporate specialized antenna arrays within devices that - when combined with specialized software - can help detect location and direction of UHF RFID tags. Impinj's xSpan (www.atlasrfidstore.com/impinj-xspan-gateway-rfid-reader/) and xArray (www.atlasrfidstore.com/impinj-xarray-gateway-rfid-reader/) are two such devices. The biggest caveat to any such device is that software will be needed to make sense of the data and determine direction. For the two products mentioned above, ItemSense software (www.atlasrfidstore.com/impinj-itemsense-software/) could be used to interface with the readers, but - even then - you'd still need to write a program to take the output from ItemSense and do whatever you want with the data.
Hi Atlas RFID Store, thanks for the video explaining "Read Range". I have a question regarding point 4 "Reader Power Setting", lets assume I have a impinj fixed reader R420, and an antenna and a set of UHF tags. In an environment I would like to deploy the system in, the antenna is capable of reading the tags at maximum distance of 4 metre. The default power setting for this antenna is 30db. How do I estimate the correct number of db if I want the maximum distance to be only 1.5 metre? It is probably very dependent on many factors, but is there a rule of thumb of how we could estimate the calculation for this?
You are correct in that, the read distance is dependent upon many factors. That said, if you change NO other variables except for the reader's transmit power, then you can still likely achieve the reduction from 4 meters to 1.5 meters by testing various transmit power settings. In short, no, there isn't a rule of thumb; however, it shouldn't take too much testing to determine what the transmit power should be (again assuming NO other variables are changing). The Impinj Speedway Revolution R420 RFID reader is capable of setting its transmit power as low as 15 dB and as high as 32.5 dB (when using AC power). Furthermore, you can use increments of 0.25 dB to fine tune the setting. For your purposes, I recommend reducing by 3 dB at a time until you are below the 1.5 meter range, and then stepping up by 0.5 or 0.25 units at a time until you reach 1.5 meters of range.
Thank you very much for the answer. A few more questions please if you wouldn't mind, you mentioned one of the factors (of read range) is cables. You showed in the video, two types of cable (one is a thin one and the other is much thicker). What are they specifically? Are they RG58 or RG223 cables? Is it always the thicker the better or it also depends on the materials used for the conductor inside? What are their diameters? Secondly, you mentioned that the longer the cable the more insulation (i.e. the thicker) it needs in order to prevent signal loss ..... you also mentioned that for the thin one it is good only upto 20 feet (which is approximately 6 metre). How long could the thick cable go before it starts to degrade in performance? 50 feet ..... 70 feet? And by performance degradation, do you mean that the antenna the cable is linked to won't be able to read as far as the case where it is linked to a cable of short length? What options have I got If for a reason, I need a cable of 80 feet to link the reader with the antenna? Could I use an UHF booster/amplifier to boost the signal up for "long cables"?
Is there a way to estimate the loss in relation to the cables length? For example for cable A, if the length is 3 metre, then the attenuation is around 2 dbi, if the length is 10 metre, then the attenuation is 7 dbi. Surely, different cables would have different characteristics?
Alex, The two cables show in the video are 195 series and 400 series. Generally speaking, the longer the antenna cable, the better insulated the cable should be in order to reduce signal loss. While better insulated cable (i.e. thicker) will always have less loss than a thinner cable, thinner cables are much easier to deploy because they tend to be much more flexible. In short, you should use whatever thickness is best for your application. We have a blog article & video on this very topic that you can find here: blog.atlasrfidstore.com/rfid-antenna-cables-getting-the-highest-performance-possible. Regarding how long a cable can be - it all depends on your application. In the above article that I reference, you'll see a cable loss chart. As the length increases, so does the loss; however, if your application requires very little read range, then it may not matter if you have a lot of loss. On the other hand, if you are trying to get as much read range as possible, then you'll want to minimize loss. For a cable of ~80 ft. or more, I'd recommend using 400 series cabling. I haven't heard of anyone using a booster/amplifier in RFID applications, so I'm not sure about that question. As always, you'll want to thoroughly test before going live in any application.
Yes, there is a way to estimate the loss in relation to the cables length; the article I referenced in an earlier reply shows a calculation table so that you can determine the amount of loss. For ease, here is the link again: blog.atlasrfidstore.com/rfid-antenna-cables-getting-the-highest-performance-possible.
Ryukoros, Are you asking if you can replace an Antenna Cable with a wireless receiver? That is impossible, unfortunately. Wi-Fi is mostly used in RFID systems to interface with and transmit data between an RFID reader and a computer. Thanks!
Hello. I have a question about the reading RFID from long distance and large area. The question is more like for the large area detection but I know that the RFID antenna (13.56MHz) has a limitation increasing the sizes, then we need to use multiple antennas. I am wondering how will the antennas influence or interfere each others. I saw the antenna multiplexing and very sure that it has to be used. However, if the antennas are close to each other (maybe 2 with 30 X 30cm sizes), how long should I put the antennas apart? Is it possible to cover large area or do you have any suggestions on this? Thank you very much!
We are implementing a UHF Rfid solution for a gold jewelry retail chain. Could you suggest some pointers that might be beneficial in this scenario such as which tags and readers to go for. Currently we are experimenting with Alien 9640 tags and Fongwah WRD-130U1 Desktop Reader. With this setup we are unable to read all the tags when they are really close. What setup(tags & readers) would you recommend and how close can the tags be so that all of them are read. Thanking you in anticipation
Umar, I haven't had any experience with the Fongwah WRD-130U1, but when i took a look at it, it looks like it only has a maximum read range between 1 - 100 cm according to the manufacturer. While these types of small, low-cost RFID readers are tempting to purchase, especially for testing, they aren't very reliable and tend to produce and an extremely limited read range. In addition, most RFID readers that we see that are this low cost, are not able to read all certified UHF RFID tags - only specific ones. My suggestion would be that you try to rent or purchase a reliable, certified UHF RFID reader that can read all UHF RFID tags. The reader you have seems to only have a max transmit power of 18 dBm - checkout these readers below that can transmit power up to 30 dBm and receive read ranges over 20 feet: 1. Impinj R120 (www.atlasrfidstore.com/impinj-speedway-revolution-r120-uhf-rfid-reader-1-port/) 2. Alien ALR-9680 (www.atlasrfidstore.com/alien-alr-9680-rfid-reader-4-port/) 3. ThingMagic Sargas (www.atlasrfidstore.com/thingmagic-sargas-2-port-uhf-rfid-reader/) Or one of these lower cost, less power, USB reader, but a trusted manufacturer: 4. Thingmagic USB Reader - (www.atlasrfidstore.com/thingmagic-usb-pro-rfid-reader/) 5. Identix miniPad - (www.atlasrfidstore.com/identix-minipad-usb-rfid-reader/) Remember, with the top three options, you will need to purchase an RFID antenna as well. Let me know if you have any more questions! Suzanne
Please kindly assist me with the materials to guide me on how to achieve the process, the above mentioned is my MEngr. Citation please I need help thank you
Sulaiman, We do not do any type of coding or system development - we are an RFID hardware company, I'm sorry. If you are using an RFID reader that has an open API, you can use that to custom create what you are looking for. Sorry we can't be of more help!
If an RFID card is placed at the bottom of a swimming pool containing water, it would be impossible to read the tag's information. This is due to the dense concentration of liquid between the RFID reader and the RFID tag. Water and other liquids absorb the radio waves; so, if there is a high concentration of liquid between the RFID tag and reader, the radio waves will be absorbed before they able to reach and interrogate the RFID tag. Take a look at this blog that discusses the factors in your environment that affect the ways that radio waves travel. blog.atlasrfidstore.com/rfid-multipath-em-waves
Peter Bluetooth in general shouldn't affect your RFID system or testing. Bluetooth is at a much higher frequency - 2400 - 2483.5 (2.4 GHz), so it wouldn't impact a lower frequency range like UHF is. Thanks for the question!
@@atlasrfidstore well as it turns out the question was wrong. The client has asked me "We are concerned about RFI (Radio Frequency Interference), which is noise generated from the lighting system. We test antenna on most radio bands from 100 to 7200 MHz, and if the lighting system generates noise in those bands, it would compromise our testing." What do you think? Thank you!
I've got a cheap RFID reader (rc522), it works great (almost 4cm reading distance with a mifare tag!!!) but it can't read certain tags. To solve the problem i put a metal plate 1cm below the reader and i was able to read the tag, but the reading distance decreased with the tags that are normally working the reader!!! I am wondering why is it so because I get more power so I'm able to read a tag which was not working but even with more power to the tag the reading distance decreases!
+Integrated Electronics The video above focuses primarily on UHF RFID (~860-960 MHz), whereas Mifare tags are in the HF range of 13.56 MHz. Where UHF RFID primarily uses capacitive coupling & backscatter to communicate between the tags and the readers, HF RFID uses inductive magnetic coupling in order to communicate between the reader and the tag [read more here: blog.atlasrfidstore.com/near-field-vs-far-field-rfid-antennas]. Without knowing more specifics, it is hard to address your comment with certainty; however, introducing the metal plate shouldn't affect the reader's transmit power. More likely, the metal plate is altering the RF field and, because the different tags have different sized antennas, the read range results are being altered as well - i.e. one setup (without the metal plate) works better with a particular antenna design (tag A), whereas a different setup (introduction of the metal plate) works better with a different tag (tag B). If you have any other questions, please comment here or email us at info@atlasRFIDstore.com.
CIRCULAR UHF RFID ANTENNA + PASSIVE TAGS SPEEDING VEHIGLES: Hello, I have circular 8dbi UHF RFID antenna with embbeded reader. I use passive tags attatched to motorcycles. I expect the bike passes in a range of speed up to 30mph and max.15 feet. I should improve the sensitivity and I have readed that exists BAP (Battery assisted passive) tags. I would like to know the effectivity increrase of these tags for my purpose and wich other things could i do to achieve this. Thank you so much.
+Lluis Nieto Thank you for your comment. BAP RFID tags may work well in your case because of their increased sensitivity and ability to transmit data for greater ranges. There aren't many BAP tags on the market currently, but you can check out the specifications and pricing here: www.atlasrfidstore.com/confidex-survivor-bap-rfid-tag-battery-assist-passive/. If you think BAP RFID tags may be of benefit to you, I recommend only buying a small amount first for thorough testing. Of note, because BAP tags are more expensive, I highly recommend testing a variety of other passive RFID tags too. Of course, you'll need to keep in mind any environmental factors that the tags may have to weather (i.e. heat, rain, vibration, etc.) and then be sure to select the most suitable RFID tags. In addition to tags, you may want to consider expanding your coverage area for energizing (and then reading) RFID tags. By adding additional antennas, you can create a larger read zone which will allow tags to be in the field longer and have more time to energize & respond. The least expensive way to test this is if your current setup allows you to add additional antennas to the RFID reader. I hope this information helps. Please let us know if you have any other questions or comments.
An asian seller said that BAP tags use 'impinj'. Don't really know if its a protocol or a band and i'm not sure if this feature was something specific from the tags that seller had or is for all BAP tags. Could you sell me BAP tags to try it?
+Lluis Nieto Generally, speaking RFID tags use a variety of integrated circuits (ICs), or chips, some of which are manufactured by Impinj (other major players in the UHF IC field are Alien and NXP). BAP RFID tags specifically also have a variety of chips a manufacturer may use. Ultimately, you want to be sure that the tag's IC meets any memory requirements that you may have. Also, with regard to UHF RFID, most BAP tags are compatible with the gen2 standard (i.e. ISO 18000-6C). If you are interested in buying BAP RFID tags, please see the link below. You can purchase as few as 5 tags for testing: www.atlasrfidstore.com/confidex-survivor-bap-rfid-tag-battery-assist-passive/.
Hello. I'm going to use simple MRFC22 RFID sensor inside a backpack, specifically on the backpack surface/layer. Is it possible to operate the RFID that way? Can the RFID sensor read the RFID tag through fabric? Thanks!
We're not familiar with that particular reader, but we can provide some insights into general operation of RFID readers. The read range of most RFID applications will depend greatly on the reader, the antenna being used, and the tags used in the application. Different RFID protocols (like ISO 14443 A) are meant for very close range applications, so read range will only be a couple of inches at the most, while the EPC Gen2 protocols will offer much more read range and higher gain antennas. Typically, cloth and similar materials will not impede RF energy. However, any metallic object or fabric nearby will reflect the RF energy and can cause the results to be unpredictable. In any case, thorough testing is the key to any successful RFID deployment!
Bluetooth devices shouldn't cause any interference at all in your RFID system unless they are using the same frequency range. If you are using a UHF RFID system with a frequency range of 860 - 960 MHz and your Bluetooth devices are using the typical 2.4 GHz, there should be no interference at all between the two. I would just check the frequency ranges to be sure! Thanks!
hi there, i have a general question. say for example i have a esky/cooler full of water bottles with rfid tags. would the plastic installation of the container affect the read range?
The thick plastic of the cooler walls would likely attenuate the signal somewhat, but not to the extent that you couldn't read through the plastic walls. To know exactly how much the signal may be affected, you'd have to do some testing. However, the bigger concern is the liquid content inside the bottles as well as the cooler itself (if it were to have ice/icy water). Because water absorbs RF energy, you would likely have a difficult time reading all the tags. There more water there is, the bigger problem you'll have. Best case, you have no ice in the cooler (i.e. just the water bottles themselves), you are using the right type of tag, and the tags are all facing toward the cooler walls (i.e. not facing in and/or covered by other water bottles). Worst case, you have as many water bottles as possible in the cooler, the tags are facing any given direction, and there is also icy water surrounding the water bottles. In short, reading RFID tags through and around water can be a difficult scenario. If you'd like to read more on this topic, please see this blog post: blog.atlasrfidstore.com/factoring-environment-rfid-deployments.
i want to make an antenna for rfid rc 522 to increase its range upto 1 feet for reading key chain shaped tag....please suggest me how to make antenna for this?
Hi, I know that this video is a litle bit old, but i'm having problem to read about 100 tags, the smaller and the most common tag. I have 4 antennas and they are at 2 feet from the tags. I have metal box, 2 meters tall and 1,3 meters large, and I put the tags 1,5 feet from the antennas. The tags are placed with jeans pants and when I try to read 100 I get 98 of 100.
Hi! First sorry if this question is duplicated. I wonder is the reader antenna size matters on detection range. Also, generally, how does more tags in the range affects the detection? Does more tags reduce the range or totally block the single tag identification? Many thanks!
It isn't the size of the antenna that matters per se; it is primarily the gain of the antenna that matters with regard to longer or shorter read range. Generally speaking, if all other variables are equal, a higher gain antenna will result in greater read range than a lower gain antenna. Also, to be clear, higher gain antennas are typically larger in size than lower gain antennas. Lastly, you should also consider the differences between linear and circular polarized antennas: blog.atlasrfidstore.com/circular-polarization-vs-linear-polarization. With regard to the number of RFID tags in the read field affecting the detection of all tags, that is primarily handled within the RFID reader. Generally speaking, a high volume of RFID tags might pose an issue and interfere with attempting to singulate a given tag; however, there are ways to compensate for this. For example, some RFID readers have greater processing power and, thus, have the ability to process hundreds of tag reads per second. Further, if you know the tag ID you are attempting to read (or at least the header), then you can tell the reader to ignore any tags that don't meet those certain characteristics which will greatly aid it in quickly isolating the tag in question.
Hi Atlas RFID Store, I have browsed through your e-store, but couldn't find an omnidirectional antenna that has 360 degree beamwidth (horizontal), is there any? Secondly, I am trying to find in your store an antenna with a small beamwidth (preferable less than 15 degree horizontally or vertically), this is because I would like to try to setup a gate alarm system in a warehouse, where if the system detects an unauthorized tags passing the gate, then an alarm would trigger. So a small beamwidth is necessary to avoid false alarm due to nearby items which are close to the gate but hasn't passed it yet. Do you have such an antenna?
I searched and found this omni antenna (from fiberglass), could this be used? the link is as following s9.postimg.org/8hqqv38tr/Omnidirectional_3.jpg Also, in your website I am trying to find antenna of gain around 15dbi, is there any?
Because most passive RFID applications require directional antennas, we don't currently offer any omni-directional RFID antennas. Additionally, we don't offer any antennas with a beamwidth as narrow as you describe above. I'm not sure that any exist within the 902-928 MHz range that traditional Gen2 passive RFID utilizes. I believe the smallest beamwidth we offer is ~30 degrees. That said, regardless of how narrow the beamwidth is, that factor alone may not be enough to ensure you don't capture stray RFID tag reads. Because of multi-path reflections, any RFID system may intercept certain unwanted tag reads. [Read more about Multi-path & RFID here: blog.atlasrfidstore.com/rfid-multipath-em-waves]
Without seeing the complete specifications of the antenna that you linked, it is hard to say for certain; however, based upon the small amount of information contained in the link, it does appear that the antenna in question might work with a traditional Gen2 RFID system. Of course, you would need to thoroughly test to be sure. Regarding antennas with a gain of 15 dBi, that isn't something we currently offer. Our highest gain antenna, is a 12.5 dBi Linear Antenna (www.atlasrfidstore.com/mti-mt-263006-n-lp-outdoor-rfid-antenna-902-928-mhz/). I've never heard of an antenna in the 902-928 MHz range with a gain of 15 dBi; it may exist, I'm just not aware of any. Also, for every 3 dB, the power output ~doubles. A 12.5 dBi antenna is already very powerful, so a 15 dBi would be extremely powerful. If used with an RFID system, you'd need to be sure you weren't exceeding any FCC regulations.
Sorry, I should have uploaded a more detailed spec of the antenna. The more detailed link is below: s10.postimg.org/oaumxynmh/Omni_5_B.jpg Is 15dbi gain antenna twice as powerful as the 12 dbi gain antenna? Or dbi and db is a different unit of measure?
another question is, what if I require 12 antennas for my application since R420 has only 4 ports of antenna? Is that possible, or do I have to use another R420?
Impinj actually offers a solution for exactly the situation you describe; it is an antenna multiplexer that they call and "Antenna Hub" (www.atlasrfidstore.com/impinj-speedway-antenna-hub/). Each hub allows the user to connect up to 8 antennas per port; so, on a 4-port Impinj R420 reader, you could potentially connect up to 32 antennas. One downside of using the Antenna Hub product is that it uses up the GPIO functionality of the reader in order to control the switching on the hub. One other caveat is that the Antenna Hub isn't recommended if you have very long runs of antenna cable. Lengths of 50 feet (or maybe slightly longer) are likely the max length that should be used. If anything longer is needed, then it may be better to add additional readers instead.
If I choose to use these 2 Antenna Hubs (2 x 8 ports = 16 ports) since I require in total 12 ports only, what would differ in terms of performance, compared to if I set R420 (without Hubs) with only 4 antennas: - Would signal be weaker, since now there are 12 ports to be "served"? - Would reading speed be different? I guess for this one, the answer is no, because the processor module is still the same one. - I would connect first antenna hub to the first port in R420, and the second antenna hub to the third port in R420. And following that, I would connect antenna 1 - 8 to ports 1 - 8 in the first antenna hub, and antenna 9 - 12 to ports 1 - 4 in the second antenna hub. Could I command each of these 12 antennas to switch on/off independently? Or could I only command antenna (1 - 8) and antenna (9 - 12) independently?
Alex, I'll answer both sets of questions above in this one reply. To address the question of interference/performance degradation, that should occur if a hub (or multiple hubs) are used with a single reader. This is because, for any given RFID reader, only one antenna transmits at a time; so, the antennas shouldn't interfere with one another. That said, if you have multiple RFID readers deployed in close proximity, there is a chance for interference. If this latter scenario is the case, you would want to ensure that the Impinj R420 readers are all set to "dense reader" mode. In this setup, readers "listen" for other readers and auto-set their transmit frequencies so as to avoid interfering with other RFID readers in the area. Nowadays, the readers (and their respective firmware) are so good that this type of interference isn't really much of an issue anymore. Regarding the use of 2 antenna hub/multiplexers, the signal wouldn't be too much weaker. While inserting any additional components between the reader and the antenna (e.g. cables, adapters, antenna hubs) does introduce loss, the amount of loss isn't tremendous (maybe 1/3 to 1/2 dB). Otherwise, because the reader only fires one port at a time, the signal will be just as strong across 12 antennas as it will be across 4. Regarding the "reading speed", you are correct in that the processing would be handled the same and that the antenna hub wouldn't slow down the reader's ability to process tag reads. However, it is important to note that because an RFID reader only transmits via one port at a time, for every antenna added, the cycle time to get back around to "Antenna 1" takes longer. Even if you only transmit for 100 milliseconds per antenna, with 32 antennas, it will take just over 3 seconds to cycle back to the first antenna. In certain RFID applications, that length of time can equate to many missed reads. Of course, you can shorten the transmit time per antenna, but that may also lead to missed reads. Regarding controlling the antennas via commands, each antenna will be able to receive individual commands; so, you will be able to control antennas 1 - 12 as "individual" antennas if the antenna hub is setup properly. In short, antenna hubs/multiplexers are not ideal for every application and should only be used after careful consideration and thorough testing.
Unfortunately, no, LF tags have a very short read range and the max read distance is probably just a few centimeters. Generally speaking, the smaller the tag, the less read range as well.
Hi, I am looking into making an RFID Gate for a workshop we have at the college I go to. We have issues with people walking off with tools and not bringing them back. I am working on making a RFID gate at the doors that can read tags on tools and flash a light and beep if someone walks out of the shop with a tool. I am assuming I need a linear antenna, but I am also trying to figure out how to make a very specific distance for the read range. I don't want the alarm going off just because someone is using a tool 10 feet away. Read angle would be interesting, as well as tag placement on tools. Any suggestions on what to use as far as readers and tags? I was thinking about something in the UHF range, 860-960Mhz. I am sure I could adjust the read power to mess with the range on an 860-960Mhz reader. Just curious if you have any suggestions for something like this.
This is a great application for an RFID portal and could be very useful for the college. I agree, read angle and tag placement would have to be tested depending on the size of the area as well as the size of the tools. Tag selection will be critical for this application, so be sure to check out our guide to help you find the best tags for your project: www.atlasrfidstore.com/a-guide-to-uhf-rfid-tags/ Another thing to consider is how large the gate area is in terms of width and height. This will help dictate the types and number of antennas needed for coverage. For this application, I would strongly recommend circular antennas because you won't know the exact orientation of the tag when it leaves - e.g. if it's in a book bag, or being carried, etc. Read more about choosing the right antenna here: www.atlasrfidstore.com/9-tactics-for-choosing-an-rfid-antenna/ For RFID readers I would suggest a 4-port version depending on the size of the area. There are many other important options to consider, too. Please check out our guide on selecting the right reader: www.atlasrfidstore.com/an-intro-to-rfid-readers-basic-options-and-features/ If you'd like help beyond our guides, we have experienced sales engineers that could assist you - walking you through the right steps and pointing you to a specific reader, antenna, and narrowing it down to a few tags. Please don't hesitate to reach out to us: www.atlasrfidstore.com/contact-us/. Let me know if you have any other specific questions!
please help me, I have UHF RFID middle range ...I want to make a smart parking combining RFID middle range and RFID RC522 with arduino, but I still do not know how to use middle range UHF RFID. can I have ur contact sir?
Can this Tecsun AN-200 AM/MW Rotatable Tuneable Loop Gain Radio Antenna(No Battery Needed) work for a rfid antenna or can this antenna be modified to work? And is it possible for you to show how
I don't think that's possible since it is set to only receive AM waves. An antenna would have to be set to the exact band in order to read UHF RF waves. I would probably ask the manufacturer if it can be modified to work, and how.
That is a very good question. Because this video focuses primarily on UHF RFID, in retrospect, it would have been more clear to title the video "Six Factors that Affect UHF RFID Read Range". I'll ask the marketing team to consider that change. With regard to frequency and relative read ranges, we do have a brief blog post that addresses the topic: blog.atlasrfidstore.com/which-rfid-frequency-is-right-for-your-application.
water? u trying to read through a swiming pool? RF atinuation from rain usually isnt very noticable till 1.7ghz. uhf rfid is like 900mhz ish aka 0.9Ghz.
Because water absorbs RF energy, its presence can cause missed reads in a UHF RFID system. For example, due to the water content of the human body, race timers using UHF RFID systems typically use a foam spacer between the runner and the RFID tag to increase read rates. As another example, although there are millions of UHF tags used to track laundry/linens/uniforms, etc. every year, they aren't typically read while the laundry is wet due to the interference caused by water. Read rates are greatly increased when the laundry is dry.
Thanks! This will help with my Arduino project to play the Imperial March whenever my boss walks up to my cubicle (he always has his RFID card around his neck).
Hahah good luck!!
Good high-level overview. Well done. Thank you.
Glad it was helpful!
Im working on an RFID alarm system for our university, many people just casually walk out with books from our small technical library... One interesting thing I saw is a product called iD top from Nedap, it is an overhead RFID reader/security device.
One interesting aspect it has is beam steering, which stops false alarms (only sounds when tags are moving, and in a particular direction). I wonder how hard would it be to build something similar? Does it require special antennas? Special receiver?
One of the latest techniques is for manufacturers to incorporate specialized antenna arrays within devices that - when combined with specialized software - can help detect location and direction of UHF RFID tags. Impinj's xSpan (www.atlasrfidstore.com/impinj-xspan-gateway-rfid-reader/) and xArray (www.atlasrfidstore.com/impinj-xarray-gateway-rfid-reader/) are two such devices. The biggest caveat to any such device is that software will be needed to make sense of the data and determine direction. For the two products mentioned above, ItemSense software (www.atlasrfidstore.com/impinj-itemsense-software/) could be used to interface with the readers, but - even then - you'd still need to write a program to take the output from ItemSense and do whatever you want with the data.
Hi Atlas RFID Store, thanks for the video explaining "Read Range". I have a question regarding point 4 "Reader Power Setting", lets assume I have a impinj fixed reader R420, and an antenna and a set of UHF tags. In an environment I would like to deploy the system in, the antenna is capable of reading the tags at maximum distance of 4 metre. The default power setting for this antenna is 30db. How do I estimate the correct number of db if I want the maximum distance to be only 1.5 metre? It is probably very dependent on many factors, but is there a rule of thumb of how we could estimate the calculation for this?
You are correct in that, the read distance is dependent upon many factors. That said, if you change NO other variables except for the reader's transmit power, then you can still likely achieve the reduction from 4 meters to 1.5 meters by testing various transmit power settings.
In short, no, there isn't a rule of thumb; however, it shouldn't take too much testing to determine what the transmit power should be (again assuming NO other variables are changing). The Impinj Speedway Revolution R420 RFID reader is capable of setting its transmit power as low as 15 dB and as high as 32.5 dB (when using AC power). Furthermore, you can use increments of 0.25 dB to fine tune the setting.
For your purposes, I recommend reducing by 3 dB at a time until you are below the 1.5 meter range, and then stepping up by 0.5 or 0.25 units at a time until you reach 1.5 meters of range.
Thank you very much for the answer.
A few more questions please if you wouldn't mind, you mentioned one of the factors (of read range) is cables. You showed in the video, two types of cable (one is a thin one and the other is much thicker). What are they specifically? Are they RG58 or RG223 cables? Is it always the thicker the better or it also depends on the materials used for the conductor inside? What are their diameters?
Secondly, you mentioned that the longer the cable the more insulation (i.e. the thicker) it needs in order to prevent signal loss ..... you also mentioned that for the thin one it is good only upto 20 feet (which is approximately 6 metre). How long could the thick cable go before it starts to degrade in performance? 50 feet ..... 70 feet? And by performance degradation, do you mean that the antenna the cable is linked to won't be able to read as far as the case where it is linked to a cable of short length?
What options have I got If for a reason, I need a cable of 80 feet to link the reader with the antenna? Could I use an UHF booster/amplifier to boost the signal up for "long cables"?
Is there a way to estimate the loss in relation to the cables length? For example for cable A, if the length is 3 metre, then the attenuation is around 2 dbi, if the length is 10 metre, then the attenuation is 7 dbi.
Surely, different cables would have different characteristics?
Alex,
The two cables show in the video are 195 series and 400 series. Generally speaking, the longer the antenna cable, the better insulated the cable should be in order to reduce signal loss. While better insulated cable (i.e. thicker) will always have less loss than a thinner cable, thinner cables are much easier to deploy because they tend to be much more flexible. In short, you should use whatever thickness is best for your application. We have a blog article & video on this very topic that you can find here: blog.atlasrfidstore.com/rfid-antenna-cables-getting-the-highest-performance-possible.
Regarding how long a cable can be - it all depends on your application. In the above article that I reference, you'll see a cable loss chart. As the length increases, so does the loss; however, if your application requires very little read range, then it may not matter if you have a lot of loss. On the other hand, if you are trying to get as much read range as possible, then you'll want to minimize loss.
For a cable of ~80 ft. or more, I'd recommend using 400 series cabling. I haven't heard of anyone using a booster/amplifier in RFID applications, so I'm not sure about that question. As always, you'll want to thoroughly test before going live in any application.
Yes, there is a way to estimate the loss in relation to the cables length; the article I referenced in an earlier reply shows a calculation table so that you can determine the amount of loss. For ease, here is the link again: blog.atlasrfidstore.com/rfid-antenna-cables-getting-the-highest-performance-possible.
regarding the cable, would it effect much if I use a wireless receiver and/or transfer?
Ryukoros,
Are you asking if you can replace an Antenna Cable with a wireless receiver? That is impossible, unfortunately. Wi-Fi is mostly used in RFID systems to interface with and transmit data between an RFID reader and a computer.
Thanks!
Hello. I have a question about the reading RFID from long distance and large area. The question is more like for the large area detection but I know that the RFID antenna (13.56MHz) has a limitation increasing the sizes, then we need to use multiple antennas. I am wondering how will the antennas influence or interfere each others. I saw the antenna multiplexing and very sure that it has to be used. However, if the antennas are close to each other (maybe 2 with 30 X 30cm sizes), how long should I put the antennas apart? Is it possible to cover large area or do you have any suggestions on this? Thank you very much!
We are implementing a UHF Rfid solution for a gold jewelry retail chain.
Could you suggest some pointers that might be beneficial in this scenario such as which tags and readers to go for.
Currently we are experimenting with Alien 9640 tags and Fongwah WRD-130U1 Desktop Reader. With this setup we are unable to read all the tags when they are really close. What setup(tags & readers) would you recommend and how close can the tags be so that all of them are read.
Thanking you in anticipation
Umar,
I haven't had any experience with the Fongwah WRD-130U1, but when i took a look at it, it looks like it only has a maximum read range between 1 - 100 cm according to the manufacturer. While these types of small, low-cost RFID readers are tempting to purchase, especially for testing, they aren't very reliable and tend to produce and an extremely limited read range. In addition, most RFID readers that we see that are this low cost, are not able to read all certified UHF RFID tags - only specific ones.
My suggestion would be that you try to rent or purchase a reliable, certified UHF RFID reader that can read all UHF RFID tags. The reader you have seems to only have a max transmit power of 18 dBm - checkout these readers below that can transmit power up to 30 dBm and receive read ranges over 20 feet:
1. Impinj R120 (www.atlasrfidstore.com/impinj-speedway-revolution-r120-uhf-rfid-reader-1-port/)
2. Alien ALR-9680 (www.atlasrfidstore.com/alien-alr-9680-rfid-reader-4-port/)
3. ThingMagic Sargas (www.atlasrfidstore.com/thingmagic-sargas-2-port-uhf-rfid-reader/)
Or one of these lower cost, less power, USB reader, but a trusted manufacturer:
4. Thingmagic USB Reader - (www.atlasrfidstore.com/thingmagic-usb-pro-rfid-reader/)
5. Identix miniPad - (www.atlasrfidstore.com/identix-minipad-usb-rfid-reader/)
Remember, with the top three options, you will need to purchase an RFID antenna as well. Let me know if you have any more questions!
Suzanne
I really need a help on how to achieve develop rfid WBAN real time tracking using Sybase or c++
Please kindly assist me with the materials to guide me on how to achieve the process, the above mentioned is my MEngr. Citation please I need help thank you
Sulaiman,
We do not do any type of coding or system development - we are an RFID hardware company, I'm sorry. If you are using an RFID reader that has an open API, you can use that to custom create what you are looking for.
Sorry we can't be of more help!
Hi What about using in a swimming pool bottom, would attenuation be too much to read the cards?
If an RFID card is placed at the bottom of a swimming pool containing water, it would be impossible to read the tag's information. This is due to the dense concentration of liquid between the RFID reader and the RFID tag.
Water and other liquids absorb the radio waves; so, if there is a high concentration of liquid between the RFID tag and reader, the radio waves will be absorbed before they able to reach and interrogate the RFID tag.
Take a look at this blog that discusses the factors in your environment that affect the ways that radio waves travel. blog.atlasrfidstore.com/rfid-multipath-em-waves
Will Bluetooth lighting controls effect RFID testing of antennas?
Peter
Bluetooth in general shouldn't affect your RFID system or testing. Bluetooth is at a much higher frequency - 2400 - 2483.5 (2.4 GHz), so it wouldn't impact a lower frequency range like UHF is. Thanks for the question!
@@atlasrfidstore well as it turns out the question was wrong. The client has asked me "We are concerned about RFI (Radio Frequency Interference), which is noise generated from the lighting system.
We test antenna on most radio bands from 100 to 7200 MHz, and if the lighting system generates noise in those bands, it would compromise our testing."
What do you think? Thank you!
I've got a cheap RFID reader (rc522), it works great (almost 4cm reading distance with a mifare tag!!!) but it can't read certain tags. To solve the problem i put a metal plate 1cm below the reader and i was able to read the tag, but the reading distance decreased with the tags that are normally working the reader!!!
I am wondering why is it so because I get more power so I'm able to read a tag which was not working but even with more power to the tag the reading distance decreases!
+Integrated Electronics
The video above focuses primarily on UHF RFID (~860-960 MHz), whereas Mifare tags are in the HF range of 13.56 MHz. Where UHF RFID primarily uses capacitive coupling & backscatter to communicate between the tags and the readers, HF RFID uses inductive magnetic coupling in order to communicate between the reader and the tag [read more here: blog.atlasrfidstore.com/near-field-vs-far-field-rfid-antennas].
Without knowing more specifics, it is hard to address your comment with certainty; however, introducing the metal plate shouldn't affect the reader's transmit power. More likely, the metal plate is altering the RF field and, because the different tags have different sized antennas, the read range results are being altered as well - i.e. one setup (without the metal plate) works better with a particular antenna design (tag A), whereas a different setup (introduction of the metal plate) works better with a different tag (tag B).
If you have any other questions, please comment here or email us at info@atlasRFIDstore.com.
+Atlas RFID Store Thank you very much for your quick reply!
Thanks for putting up a great and informative video.
No problem!
CIRCULAR UHF RFID ANTENNA + PASSIVE TAGS SPEEDING VEHIGLES: Hello, I have circular 8dbi UHF RFID antenna with embbeded reader. I use passive tags attatched to motorcycles. I expect the bike passes in a range of speed up to 30mph and max.15 feet. I should improve the sensitivity and I have readed that exists BAP (Battery assisted passive) tags. I would like to know the effectivity increrase of these tags for my purpose and wich other things could i do to achieve this. Thank you so much.
+Lluis Nieto
Thank you for your comment. BAP RFID tags may work well in your case because of their increased sensitivity and ability to transmit data for greater ranges. There aren't many BAP tags on the market currently, but you can check out the specifications and pricing here: www.atlasrfidstore.com/confidex-survivor-bap-rfid-tag-battery-assist-passive/. If you think BAP RFID tags may be of benefit to you, I recommend only buying a small amount first for thorough testing.
Of note, because BAP tags are more expensive, I highly recommend testing a variety of other passive RFID tags too. Of course, you'll need to keep in mind any environmental factors that the tags may have to weather (i.e. heat, rain, vibration, etc.) and then be sure to select the most suitable RFID tags.
In addition to tags, you may want to consider expanding your coverage area for energizing (and then reading) RFID tags. By adding additional antennas, you can create a larger read zone which will allow tags to be in the field longer and have more time to energize & respond. The least expensive way to test this is if your current setup allows you to add additional antennas to the RFID reader.
I hope this information helps. Please let us know if you have any other questions or comments.
An asian seller said that BAP tags use 'impinj'. Don't really know if its a protocol or a band and i'm not sure if this feature was something specific from the tags that seller had or is for all BAP tags. Could you sell me BAP tags to try it?
+Lluis Nieto
Generally, speaking RFID tags use a variety of integrated circuits (ICs), or chips, some of which are manufactured by Impinj (other major players in the UHF IC field are Alien and NXP). BAP RFID tags specifically also have a variety of chips a manufacturer may use. Ultimately, you want to be sure that the tag's IC meets any memory requirements that you may have. Also, with regard to UHF RFID, most BAP tags are compatible with the gen2 standard (i.e. ISO 18000-6C).
If you are interested in buying BAP RFID tags, please see the link below. You can purchase as few as 5 tags for testing: www.atlasrfidstore.com/confidex-survivor-bap-rfid-tag-battery-assist-passive/.
Hello. I'm going to use simple MRFC22 RFID sensor inside a backpack, specifically on the backpack surface/layer. Is it possible to operate the RFID that way? Can the RFID sensor read the RFID tag through fabric? Thanks!
We're not familiar with that particular reader, but we can provide some insights into general operation of RFID readers.
The read range of most RFID applications will depend greatly on the reader, the antenna being used, and the tags used in the application. Different RFID protocols (like ISO 14443 A) are meant for very close range applications, so read range will only be a couple of inches at the most, while the EPC Gen2 protocols will offer much more read range and higher gain antennas.
Typically, cloth and similar materials will not impede RF energy. However, any metallic object or fabric nearby will reflect the RF energy and can cause the results to be unpredictable.
In any case, thorough testing is the key to any successful RFID deployment!
If we carry bluetooth devices like tws earbuds... Will it cause any malfunctioning in the rfid reading at track and field i mean
Bluetooth devices shouldn't cause any interference at all in your RFID system unless they are using the same frequency range. If you are using a UHF RFID system with a frequency range of 860 - 960 MHz and your Bluetooth devices are using the typical 2.4 GHz, there should be no interference at all between the two. I would just check the frequency ranges to be sure!
Thanks!
hi there, i have a general question. say for example i have a esky/cooler full of water bottles with rfid tags. would the plastic installation of the container affect the read range?
The thick plastic of the cooler walls would likely attenuate the signal somewhat, but not to the extent that you couldn't read through the plastic walls. To know exactly how much the signal may be affected, you'd have to do some testing. However, the bigger concern is the liquid content inside the bottles as well as the cooler itself (if it were to have ice/icy water). Because water absorbs RF energy, you would likely have a difficult time reading all the tags. There more water there is, the bigger problem you'll have.
Best case, you have no ice in the cooler (i.e. just the water bottles themselves), you are using the right type of tag, and the tags are all facing toward the cooler walls (i.e. not facing in and/or covered by other water bottles). Worst case, you have as many water bottles as possible in the cooler, the tags are facing any given direction, and there is also icy water surrounding the water bottles. In short, reading RFID tags through and around water can be a difficult scenario.
If you'd like to read more on this topic, please see this blog post: blog.atlasrfidstore.com/factoring-environment-rfid-deployments.
i want to make an antenna for rfid rc 522 to increase its range upto 1 feet for reading key chain shaped tag....please suggest me how to make antenna for this?
So sorry - we don't make antennas so I'm not sure how to go about that!
Hi, I know that this video is a litle bit old, but i'm having problem to read about 100 tags, the smaller and the most common tag. I have 4 antennas and they are at 2 feet from the tags. I have metal box, 2 meters tall and 1,3 meters large, and I put the tags 1,5 feet from the antennas. The tags are placed with jeans pants and when I try to read 100 I get 98 of 100.
Octavio, I'm just now seeing your comment. If you are still having an issue, email me at info@atlasrfidstore.com.
All right, thank you.
Hi can you give your contact number? Issue resolved?
Hi! First sorry if this question is duplicated. I wonder is the reader antenna size matters on detection range.
Also, generally, how does more tags in the range affects the detection? Does more tags reduce the range or totally block the single tag identification? Many thanks!
It isn't the size of the antenna that matters per se; it is primarily the gain of the antenna that matters with regard to longer or shorter read range. Generally speaking, if all other variables are equal, a higher gain antenna will result in greater read range than a lower gain antenna. Also, to be clear, higher gain antennas are typically larger in size than lower gain antennas. Lastly, you should also consider the differences between linear and circular polarized antennas: blog.atlasrfidstore.com/circular-polarization-vs-linear-polarization.
With regard to the number of RFID tags in the read field affecting the detection of all tags, that is primarily handled within the RFID reader. Generally speaking, a high volume of RFID tags might pose an issue and interfere with attempting to singulate a given tag; however, there are ways to compensate for this. For example, some RFID readers have greater processing power and, thus, have the ability to process hundreds of tag reads per second. Further, if you know the tag ID you are attempting to read (or at least the header), then you can tell the reader to ignore any tags that don't meet those certain characteristics which will greatly aid it in quickly isolating the tag in question.
Hi Atlas RFID Store, I have browsed through your e-store, but couldn't find an omnidirectional antenna that has 360 degree beamwidth (horizontal), is there any?
Secondly, I am trying to find in your store an antenna with a small beamwidth (preferable less than 15 degree horizontally or vertically), this is because I would like to try to setup a gate alarm system in a warehouse, where if the system detects an unauthorized tags passing the gate, then an alarm would trigger. So a small beamwidth is necessary to avoid false alarm due to nearby items which are close to the gate but hasn't passed it yet. Do you have such an antenna?
I searched and found this omni antenna (from fiberglass), could this be used? the link is as following s9.postimg.org/8hqqv38tr/Omnidirectional_3.jpg
Also, in your website I am trying to find antenna of gain around 15dbi, is there any?
Because most passive RFID applications require directional antennas, we don't currently offer any omni-directional RFID antennas.
Additionally, we don't offer any antennas with a beamwidth as narrow as you describe above. I'm not sure that any exist within the 902-928 MHz range that traditional Gen2 passive RFID utilizes. I believe the smallest beamwidth we offer is ~30 degrees.
That said, regardless of how narrow the beamwidth is, that factor alone may not be enough to ensure you don't capture stray RFID tag reads. Because of multi-path reflections, any RFID system may intercept certain unwanted tag reads. [Read more about Multi-path & RFID here: blog.atlasrfidstore.com/rfid-multipath-em-waves]
Without seeing the complete specifications of the antenna that you linked, it is hard to say for certain; however, based upon the small amount of information contained in the link, it does appear that the antenna in question might work with a traditional Gen2 RFID system. Of course, you would need to thoroughly test to be sure.
Regarding antennas with a gain of 15 dBi, that isn't something we currently offer. Our highest gain antenna, is a 12.5 dBi Linear Antenna (www.atlasrfidstore.com/mti-mt-263006-n-lp-outdoor-rfid-antenna-902-928-mhz/). I've never heard of an antenna in the 902-928 MHz range with a gain of 15 dBi; it may exist, I'm just not aware of any. Also, for every 3 dB, the power output ~doubles. A 12.5 dBi antenna is already very powerful, so a 15 dBi would be extremely powerful. If used with an RFID system, you'd need to be sure you weren't exceeding any FCC regulations.
Thank you very much for the reply, Atlas.
In that case (the gate alarm system), what would kind of antenna would you recommend me to use?
Sorry, I should have uploaded a more detailed spec of the antenna. The more detailed link is below:
s10.postimg.org/oaumxynmh/Omni_5_B.jpg
Is 15dbi gain antenna twice as powerful as the 12 dbi gain antenna? Or dbi and db is a different unit of measure?
another question is, what if I require 12 antennas for my application since R420 has only 4 ports of antenna? Is that possible, or do I have to use another R420?
Impinj actually offers a solution for exactly the situation you describe; it is an antenna multiplexer that they call and "Antenna Hub" (www.atlasrfidstore.com/impinj-speedway-antenna-hub/). Each hub allows the user to connect up to 8 antennas per port; so, on a 4-port Impinj R420 reader, you could potentially connect up to 32 antennas. One downside of using the Antenna Hub product is that it uses up the GPIO functionality of the reader in order to control the switching on the hub.
One other caveat is that the Antenna Hub isn't recommended if you have very long runs of antenna cable. Lengths of 50 feet (or maybe slightly longer) are likely the max length that should be used. If anything longer is needed, then it may be better to add additional readers instead.
If I choose to use these 2 Antenna Hubs (2 x 8 ports = 16 ports) since I require in total 12 ports only, what would differ in terms of performance, compared to if I set R420 (without Hubs) with only 4 antennas:
- Would signal be weaker, since now there are 12 ports to be "served"?
- Would reading speed be different? I guess for this one, the answer is no, because the processor module is still the same one.
- I would connect first antenna hub to the first port in R420, and the second antenna hub to the third port in R420. And following that, I would connect antenna 1 - 8 to ports 1 - 8 in the first antenna hub, and antenna 9 - 12 to ports 1 - 4 in the second antenna hub. Could I command each of these 12 antennas to switch on/off independently? Or could I only command antenna (1 - 8) and antenna (9 - 12) independently?
- Would there be more interference (signals bouncing one another too closely) and therefore performance degradation, if more antennas are deployed?
Alex,
I'll answer both sets of questions above in this one reply.
To address the question of interference/performance degradation, that should occur if a hub (or multiple hubs) are used with a single reader. This is because, for any given RFID reader, only one antenna transmits at a time; so, the antennas shouldn't interfere with one another. That said, if you have multiple RFID readers deployed in close proximity, there is a chance for interference. If this latter scenario is the case, you would want to ensure that the Impinj R420 readers are all set to "dense reader" mode. In this setup, readers "listen" for other readers and auto-set their transmit frequencies so as to avoid interfering with other RFID readers in the area. Nowadays, the readers (and their respective firmware) are so good that this type of interference isn't really much of an issue anymore.
Regarding the use of 2 antenna hub/multiplexers, the signal wouldn't be too much weaker. While inserting any additional components between the reader and the antenna (e.g. cables, adapters, antenna hubs) does introduce loss, the amount of loss isn't tremendous (maybe 1/3 to 1/2 dB). Otherwise, because the reader only fires one port at a time, the signal will be just as strong across 12 antennas as it will be across 4.
Regarding the "reading speed", you are correct in that the processing would be handled the same and that the antenna hub wouldn't slow down the reader's ability to process tag reads. However, it is important to note that because an RFID reader only transmits via one port at a time, for every antenna added, the cycle time to get back around to "Antenna 1" takes longer. Even if you only transmit for 100 milliseconds per antenna, with 32 antennas, it will take just over 3 seconds to cycle back to the first antenna. In certain RFID applications, that length of time can equate to many missed reads. Of course, you can shorten the transmit time per antenna, but that may also lead to missed reads.
Regarding controlling the antennas via commands, each antenna will be able to receive individual commands; so, you will be able to control antennas 1 - 12 as "individual" antennas if the antenna hub is setup properly.
In short, antenna hubs/multiplexers are not ideal for every application and should only be used after careful consideration and thorough testing.
Basically, it would be impossible to scan pets (2x12mm chip) from (longer) range right? like 3m?
Unfortunately, no, LF tags have a very short read range and the max read distance is probably just a few centimeters. Generally speaking, the smaller the tag, the less read range as well.
@@atlasrfidstore with a tag at the size of a card like 10x4 cm i can get a range of like 50cm? What should I do to get a such range?
Hi, I am looking into making an RFID Gate for a workshop we have at the college I go to. We have issues with people walking off with tools and not bringing them back. I am working on making a RFID gate at the doors that can read tags on tools and flash a light and beep if someone walks out of the shop with a tool. I am assuming I need a linear antenna, but I am also trying to figure out how to make a very specific distance for the read range. I don't want the alarm going off just because someone is using a tool 10 feet away. Read angle would be interesting, as well as tag placement on tools. Any suggestions on what to use as far as readers and tags? I was thinking about something in the UHF range, 860-960Mhz. I am sure I could adjust the read power to mess with the range on an 860-960Mhz reader.
Just curious if you have any suggestions for something like this.
This is a great application for an RFID portal and could be very useful for the college. I agree, read angle and tag placement would have to be tested depending on the size of the area as well as the size of the tools. Tag selection will be critical for this application, so be sure to check out our guide to help you find the best tags for your project: www.atlasrfidstore.com/a-guide-to-uhf-rfid-tags/
Another thing to consider is how large the gate area is in terms of width and height. This will help dictate the types and number of antennas needed for coverage. For this application, I would strongly recommend circular antennas because you won't know the exact orientation of the tag when it leaves - e.g. if it's in a book bag, or being carried, etc. Read more about choosing the right antenna here: www.atlasrfidstore.com/9-tactics-for-choosing-an-rfid-antenna/
For RFID readers I would suggest a 4-port version depending on the size of the area. There are many other important options to consider, too. Please check out our guide on selecting the right reader: www.atlasrfidstore.com/an-intro-to-rfid-readers-basic-options-and-features/
If you'd like help beyond our guides, we have experienced sales engineers that could assist you - walking you through the right steps and pointing you to a specific reader, antenna, and narrowing it down to a few tags. Please don't hesitate to reach out to us: www.atlasrfidstore.com/contact-us/.
Let me know if you have any other specific questions!
Very informative and nicely explained...thanks
Thanks! Glad you enjoyed the video!
please help me, I have UHF RFID middle range ...I want to make a smart parking combining RFID middle range and RFID RC522 with arduino, but I still do not know how to use middle range UHF RFID. can I have ur contact sir?
Jeean, What RFID reader are you using?
Can this Tecsun AN-200 AM/MW Rotatable Tuneable Loop Gain Radio Antenna(No Battery Needed) work for a rfid antenna or can this antenna be modified to work? And is it possible for you to show how
I don't think that's possible since it is set to only receive AM waves. An antenna would have to be set to the exact band in order to read UHF RF waves. I would probably ask the manufacturer if it can be modified to work, and how.
Cool video, thanks for the share!
No problem! Thanks for watching, if you have any questions in the future don't hesitate to contact us at info@atlasrfidstore.com.
any contact??
Are you looking for contact information for learning more?
what about frequency ???
That is a very good question. Because this video focuses primarily on UHF RFID, in retrospect, it would have been more clear to title the video "Six Factors that Affect UHF RFID Read Range". I'll ask the marketing team to consider that change.
With regard to frequency and relative read ranges, we do have a brief blog post that addresses the topic: blog.atlasrfidstore.com/which-rfid-frequency-is-right-for-your-application.
water? u trying to read through a swiming pool? RF atinuation from rain usually isnt very noticable till 1.7ghz. uhf rfid is like 900mhz ish aka 0.9Ghz.
Because water absorbs RF energy, its presence can cause missed reads in a UHF RFID system. For example, due to the water content of the human body, race timers using UHF RFID systems typically use a foam spacer between the runner and the RFID tag to increase read rates. As another example, although there are millions of UHF tags used to track laundry/linens/uniforms, etc. every year, they aren't typically read while the laundry is wet due to the interference caused by water. Read rates are greatly increased when the laundry is dry.
Hey man, what should I do to get a 50cm range of a passive reader with a tag like 10x4 cm? Any suggestions ?