In addition to its speed of reading, RFID also has many other advantages over the traditional barcode reader. For example, with a barcode you need to ensure that it is completely visible and you must have direct line of sight of the code.
If the barcode is damaged, the chances of getting a good read are extremely low. You also need to be within a short read distance and directly in front of the barcode to allow the 2D scanner to accurately decipher the code. In contrast, with an RFID handheld scanner you do not need a direct line of sight. It is possible to get a good reading even if light conditions are not optimal or if the transponder is obscured as long as it is not enclosed in metal. With an RFID transponder, you can also be further away from the item being read and you have the ability to read multiple transponders simultaneously.
The need for speed As part of the Formula Student project, the IRT develop and build their own racing cars with some very impressive performance characteristics; Nm of torque accelerates the race cars from nought to around 75mph on a 75m track. In general, I would say that you can read about 50 passive UHF RFID tags per second under favorable conditions—that is, on RF-friendly items, with minimal water or metal interference, and using high-quality tags and readers.
Login Register Now. Not a member? You must be logged in as a registered user to access. Not a registered user? Sign up for basic membership for free here. Search for:. Follow article. A need for speed As part of their Formula Student project, the IRT have been designing, developing and building high-performance electric racing cars since You can watch the tests here: In order to accurately test the equipment, we built an RFID reader and antenna alongside the track and installed an RFID transponder in each car.
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If the antennas are the ideal width apart, one can send the signal while the other receives it. Testing is key here. Key Takeaway: To lower the cost of deployment, begin testing with as few antennas as possible in order to achieve the desired read rates.
Thoroughly test the spacing between antennas before adding additional antennas. Gain — The antenna gain should be medium or high gain in order to get as much energy to the RFID tag as possible. Key Takeaway: Select an antenna with a gain of 6 dB or higher. Polarization — If the tag location is known and constant, a linearly polarized antenna will work very well for this type of application because they typically have a higher gain and more focused radiation pattern.
If the tag location is not known or constant, a circularly polarized antenna should be used. Key Takeaway: If you cannot predict the exact location of the RFID tag every time, select a circularly polarized antenna. Amount — The number of antennas to use will depend on the chosen setup. Key Takeaway: As mentioned above, to lower the cost of deployment, begin testing with as few antennas as possible in order to achieve the desired read rates.
Thoroughly test before adding additional antennas. Angle — The angle of the antenna will be an important aspect to test in any high-speed application. Experiment with positioning an antenna at various angles towards the incoming tagged item. If there are additional antennas, experiment with various angles, including one positioned towards the tagged item as it is moving away. Key Takeaway: Experiment with multiple angles for each antenna used in order to create the ideal read zone.
Type — Indoor vs. Outdoor — As with any RFID application, use an antenna rated for outdoor use if the application will be outdoors.
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