Views:0 Author:Site Editor Publish Time: 2018-05-04 Origin:Site
The RFID tag orientation and metal are two points that affect the read range of the RFID tags. The rise of RFID anti-metal tags solves part of the problem, well, do you know the fixation methods of anti-metal RFID tags?
If you can guarantee the correctness of the method, most RFID tags read best when presented in a specific orientation relative to the reader antenna. However, RFID tag in the wrong orientation may radically reduced read range or may not read at all.
In addition, metal presents a particular challenge to RFID tags and other RFID products. Most RFID tags experience reduced performance when used near metal. A RFID tag placed directly on a metal surface will likely not read at all. Some RFID tags are specifically designed for use on or near metal called RFID anti-metal tags.
These RFID anti-metal tags typically have a special housing which provides a gap of controlled thickness between the tag antenna and the metal surface or have a built-in metal foil (so the tag brings its own metal to work anywhere). The RFID tags are also tuned to optimize performance near metal. Anti-metal tags by design can only be read from the exposed portion of the tag, opposite the metal. It is impossible to read an anti-metal RFID tag from the other side of the metal surface. Some RFID tags are optimized to work on metal only. Any non-metallic spacer placed between the RFID tag and the surface may result in a reduction in performance.
Although multiple fixation methods are available for most RFID sticker tags, some methods may yield better results in a specific application. When selecting a method of tag fixation, be sure to test the method both for strength and for readability of the RFID tag prior to putting it into practice.
1. Adhesive Fixation
Adhesive fixation may be one of the simplest methods to implement and typically results in the maximum possible read range for a specific RFID tag. Regardless of the adhesive used, always ensure that the tag and surface are clean, dry and free of debris to ensure maximum bond strength. Where environmental conditions permit, a peel-and-stick adhesive may be sufficient to secure a RFID tag to a surface. When a stronger adhesive bond is required, a silicone sealant or acrylic adhesive may be used. Special glues exist for medical grade applications.
For silicone sealants, fixation must occur at room temperature and at approximately 50% humidity. Ensure the thickness of the adhesive (space between the tag and the surface) does not exceed 2 mm. Although the bond may set quickly, total curing time may be up to several days. Apply acrylic adhesives at temperatures greater than +21°C (+70°F). Once applied, pressure and moderate heating can be used to create an even stronger bond.
2. Seal tag method
Some versions of the anti-metal RFID tags are meant to be fixed to objects with standard cable ties. When the RFID tag is mounted vertically to the object’s surface, the effect of the object being wet or metallic is greatly reduced. In addition there is the Seal Tag available, which features a built-in cable tie which makes fixation quick and easy and provides tamper evidence.
3. Mechanical Fastener
Some anti-metal RFID tags have holes through which a screw or rivet can be used to secure the tag mechanically. This method is recommended for applications that involve a high risk of mechanical stress, aging or in which the temperature during fixation is too low to promote a strong bond using the adhesive method. Select a screw or rivet that is appropriate for the surface material to which the RFID tag is being applied.
Take caution when using screws or rivets with large metal heads, as the metal content can de-tune the tag, resulting in a reduced read range. Likewise, a large metal ring or washer used with an IN Tag, World tag or other circular tag may render the tag virtually unreadable.
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