Passive tag for electronic tag field

Abstract

The application discloses a passive tag which comprises a copper-clad substrate, an antenna and a dielectric slab, wherein the antenna and the dielectric slab are all positioned on the copper-clad substrate; the antenna comprises an antenna upper arm and an antenna lower arm; the antenna upper arm and the antenna lower arm are positioned on the same straight line; a gap is formed between the antenna upper arm and the antenna lower arm; a plurality of metal wires which are parallel to each other and between two of which a gap is formed are arranged on the dielectric slab; the extending direction of the metal wire is parallel to the antenna upper arm and the antenna lower arm; and the separated end parts of the antenna upper arm and the antenna lower arm are respectively connected with two ends of a metal wire in the plurality of metal wires. The passive tag does not have a working threshold, is long in communication distance, safe, reliable, small in size, convenient to process, low in cost and convenient to popularize and use, wherein the cost of a reader-writer can be reduced obviously.

Description

technical field [0001] The present invention relates to the technical field of RFID, and more specifically relates to a passive tag. Background technique [0002] At present, the RFID passive tags in the industry are composed of an antenna and an IC chip in terms of electrical performance. The working principle and process are: [0003] The reader emits carrier signals with information (such as read and write commands, status commands, etc.) through its own antenna, and transforms them into electromagnetic waves in the surrounding space; the tag antenna receives electromagnetic waves from the surrounding field and converts them into Electrical signals (voltage, current, etc.). Part of this electrical signal is rectified and filtered by the IC chip, and used as the working power of the IC chip; part of it is demodulated and decoded by the IC chip, and used as an instruction to determine the subsequent working state of the IC chip, such as writing information into the IC chi...

AI Technical Summary

Problems solved by technology

When the energy provided by the reader is insufficient (that is, the transmission power is not large enough), or the energy received by the tag antenna is insufficient, the IC chip cannot work

This determines that the tag cannot be too far away from the reader, that is, the communication distance between the two cannot be too far, which further limits the use under many environmental conditions.

[0006] 2), the system undergoes information processing such as encoding, modulation, demodulation, decoding, etc., and it is prone to bit errors. Even if errors are corrected, the efficiency of information transmission will not be high

When the received electrical signal is lower than the starting level, the IC chip cannot work normally, and the normal work between the reader and the tag cannot be completed.

[0010] 6) At present, IC chips have the functions of reading, writing and rewriting, so the stored information is easy to be rewritten or miswritten, which leads to the low security of the stored information

[0011] 7) At present, the information that the IC chip can return to the reader is stored in the reader or system server in advance, and it cannot sense the external situation and changes in real time

For example, RFID passive tags cannot be used on some cheap small commodities

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