Broadband anti-metal radio-frequency identification tag and special mounting structure for metal surface thereof

Abstract

The invention discloses a broadband anti-metal radio-frequency identification tag and a special mounting structure for a metal surface thereof. The front face of a tag substrate is provided with a tag patch antenna and a chip, the patch antenna comprises a first part and a second part, the first part and the second part are respectively and electrically connected with the chip through a first feed line and a second feed line, the vertical surfaces at two ends of the tag substrate are respectively and symmetrically provided with a first short circuit wall and a second short circuit wall, and a first coupling line unit and a second coupling line unit are symmetrically arranged near the two ends of the first feed line and the second feed line, so that a capacitive coupling structure is formed between the antenna body and a coupling antenna unit. In the special mounting structure for the metal surface, a depressed structural space for accommodating the tag is formed on the metal surface, and the tag is fixedly arranged in the depressed structural space of the metal surface. While the wave absorbing material needs not to be increased additionally, the reading and writing performance like adhesion to the surface of an ordinary object can be realized. Moreover, the radio-frequency identification tag has large bandwidth and a small size.

Description

technical field [0001] The invention relates to an RFID (Radio Frequency Identification, radio frequency identification) tag, in particular to a radio frequency identification tag which can be integrated with a metal body and used in combination with a metal surface and a special installation structure for the metal surface. Background technique [0002] RFID technology is a non-contact radio frequency identification technology. In RFID technology, the required information is stored in tags including IC (Integrated Circuit, integrated circuit) chips and antennas for wireless communication; and the RFID reader capable of collecting tag information is in LF (Low Frequency, low frequency), UHF (Ultra High Frequency, ultra-high frequency), RF (Radio Frequency, radio frequency), MWF (Microwave Frequency, microwave frequency band) frequency bands communicate with tags. [0003] Due to the different radio regulations of various countries, the working frequency bands of UHF Passive...

AI Technical Summary

Problems solved by technology

This results in the narrow bandwidth of most tags, unable to adapt to wideband work

Or cause the drift of the working frequency of the tag, resulting in a sharp decrease in the reading distance or even failure to read

[0005] The usual solution is to add a layer of absorbing material between the tag and the metal body. However, due to the limited thickness and the characteristics of the absorbing material itself, the radiation efficiency of the tag antenna will decrease, and the same tag cannot be obtained. Stable reading performance on common object surfaces

In addition, the usual UHF band tags with broadband characteristics are large in size and unsatisfactory in selectivity, so they are not suitable for management applications of small metal tools

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