Double resonance high bandwidth RFID UHF anti-metal tag and its realization method

Abstract

The invention belongs to the technical field of microstrip antennas and provides an ultrahigh frequency metal-resistant label of double-resonance high-bandwidth RFID and an obtaining method of the ultrahigh frequency metal-resistant label. The ultrahigh frequency metal-resistant label comprises a substrate, an electrode layer, a chip, a feeder line and a ground layer, screen print is conducted on the surface of the substrate through silver paste and after screen print, the substrate is provided with a pattern containing two power-distribution circuit terminals, a feeder line groove and a chip groove; the electrode layer is a silver paste layer, wherein the surface of the portion, except a pattern zone, of the substrate obtained after screen print is coated with the silver paste layer; the chip is placed in the chip groove and is provided with two contacts which are used for being connected with the electrode layer and the feeder line respectively; the feeder line is placed in the feeder line groove and communicated with the ground layer; the ground layer is a silver paste layer, wherein the back face of the whole substrate is coated with the silver paste layer; the conclusion that the feeder line is best matched with the chip when the feeder line input resistance Za(L)=27+j200 and the chip input resistance ZL=27.5-j201 is obtained through a curve chart of return loss. The ultrahigh frequency metal-resistant label has the advantages of improving the bandwidth of a microstrip antenna and being capable of normally working in various metal reflecting environments and high in applicability.

Description

technical field [0001] The invention belongs to the technical field of microstrip antennas, and in particular relates to a dual-resonance high-bandwidth RFID ultra-high frequency anti-metal tag with high bandwidth and capable of working normally in various metal reflection environments and a realization method. Background technique [0002] In logistics, asset management, and production operation management, the method of affixing printed barcodes to products or their packaging has been commonly used. However, this barcode technology has problems such as short reading distance, non-group reading, low reading efficiency, non-renewable information, and cannot be used in many special environments. [0003] For various types of RFID tags that already exist in the market, the first type is made into a dipole antenna. When it is installed on a non-conductor surface, it can obtain the read-write distance required for signal communication; but when it is attached Or when installed ...

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Problems solved by technology

However, this barcode technology has problems such as short reading distance, non-group reading, low reading efficiency, non-renewable information, and cannot be used in many special environments.

[0003] For various types of RFID tags that already exist in the market, the first type is made into a dipole antenna. When it is installed on a non-conductor surface, it can obtain the read-write distance required for signal communication; but when it is attached Or when installed on a metal surface, the metal greatly weakens the communication performance of the RFID tag, resulting in a significant reduction in the reading range. The reason for this phenomenon is that the metal surface will generate a current in the opposite direction to the dipole antenna surface current. Will cancel the electromagnetic field generated by the surface current of the dipole antenna

The second type is to increase the distance from the dipole antenna to the metal surface to reduce the influence of the metal object on it when making the dipole antenna. This method can reduce the influence of the reverse current on the surface of the metal object and increase it appropriately. Its communication distance is large, but its communication distance is still reduced compared to when it is not attached to a metal object, and its bandwidth will be narrowed. When there is a reading distance requirement or bandwidth requirement, this type of label has great application limitations.

The third type is made into a monopole antenna. When this antenna is attached to a metal surface, it still has good bandwidth and gain. This antenna is generally processed on a dielectric material by etching or silver paste printing. , its relatively high cost

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