Intelligent counter system applied to circularly polarized near-field antenna of gold and jewelry industry

Abstract

The invention elates to an intelligent counter system applied to a circularly polarized near-field antenna of the gold and jewelry industry, which comprises foldable snake-shaped load ultrahigh frequency electronic tags attached to each gold and jewelry product, a fixed near-field antenna installed below a counter in an array mode, a multipath signal acquiring device connected to the fixed near-field antenna and a real-time inventory checking workstation connected with the multipath signal acquiring device, and is characterized in that the real-time inventory checking workstation performs control on the fixed near-field antenna installed below the counter in an array mode, realizes read-write control on the electronic tags attached to objects displayed on the intelligent counter, and stores the information, which comprises stores to which the objects belong, intelligent counter and antenna position information of the belonging stores, whether the objects leave the corresponding counter or not, the starting and ending time of departure of the objects from the counter, and whether the objects are normally sold or not, of the monitored objects to the real-time inventory checking workstation; and the real-time inventory checking workstation can work independently in a local database management system and can also collaborate with a cloud database management system.

Description

technical field [0001] The present invention relates to the application of ultra-high frequency electronic tags (UHF-smart RFID, 860-960MHz) in the Internet of Things, in particular to an intelligent counter system for circularly polarized near-field antennas used in the gold and jewelry industry, for gold / jewelry to be sold The electronic tag of the item and its antenna reading and writing system can perform online monitoring and real-time inventory functions on the items placed in the smart counter, and can analyze customer behavior. Background technique [0002] Radio frequency identification (RFID) is a non-contact automatic identification technology realized by radio frequency technology. The RFID system is generally composed of two main parts: an electronic tag (tag) and a reader (reader); through a coded tag and an antenna attached to the tag, the reader and the tag perform non-contact high-speed data transmission and communication. Complete the automatic identificat...

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Problems solved by technology

[0006] On the other hand, when the electronic tags attached to gold jewelry items work on the surface of metal objects such as yellow silver rings or necklaces, etc., after the electromagnetic waves reach the target tag, they are emitted back by a small part of the tagged antenna metal surface, and most of the electromagnetic waves will be An electromagnetic radiation field is formed near the metal surface; the magnetic field part of the field only has a tangential component but no normal component, and the magnetic flux generated on the metal surface causes an induced eddy current; according to Lenz's law, the induced eddy current radiates to the reader The opposite effect of the field, which causes the magnetic field to decay rapidly on the metal surface, so that the minimum power threshold required to activate the chip cannot be reached, resulting in the tag being unable to be read, that is, the missing reading of the monitored item

In addition, the energy loss caused by the electromagnetic radiation caused by the metal will also cause additional parasitic capacitance, which will cause the detuning of the electromagnetic coupling system between the reader and the tag antenna, and destroy the performance of the system, that is, the response frequency of the electronic tag and the design frequency. Offset

The electromagnetic environment of the electronic tags working in the 860-960MHz frequency band mentioned in the present invention and the gold or silver rings attached to the counter is particularly complicated, that is, the energy reflected by the metal objects and the tags and Interference (coupling and spurious) is formed between the readers, which leads to changes in the electromagnetic parameters such as impedance matching, radiation efficiency, and directivity of the tag antenna, and the reading distance of the tag decreases rapidly, and it is even difficult to be read by the reader. Pick

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