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The article is devoted to the problem associated with the operation of radio frequency tags within the UHF range in close contact with various media. The principle of RFID system operation is explained, design features and UHF RFID tag reading for metal objects are considered. They considered one of the possible options to improve the RFID chip designed to work on metal. For radio-frequency marking of metal objects, volumetric radio-frequency tags of a special design (3D tags) should be used. The quality factor of 3D tags for working on metal objects can be reduced by introducing specially selected (calculated) shunt resistors into the microcircuit design for such tags.
Now a days, radio frequency contact less identification devices (RFID) are widely used for marking and identification purposes. Identifiers include: contactless plastic and paper cards; thin 2D self-adhesive tags; the tags made in the case (plastic) version – 3D. In the vast majority of cases, passive RFID tags are used that do not contain any power source. Such tags are used to power the microcircuit and the responses to the surrounding space of electromagnetic energy from the electromagnetic field that trains them, produced by the reader [1, 2].
Flat traditional RFID tags cannot be used for radio-frequency marking of metal objects, since they cannot be read out in close contact with metals. For radio-frequency marking of metal objects, volumetric radio-frequency tags of a special design (3D tags) should be used. 3D tags show a significant reading range during operation on metal objects. 3D tags during operation on metal objects demonstrate high-quality AFR in the following axes: frequency – reading range, which for the conditions of their use and production is more a disadvantage than an advantage. The quality factor of 3D tags for working on metal objects can be reduced by introduction of specially selected (calculated) shunt resistors for such tags into the microcircuit design. The input impedance of microcircuits used in 3D tags for working on metal should be calculated based on the requirements of a bandwidth of at least 20 MHz when setting a tag on metal.
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