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Composite electromagnetic wave absorbing material used for radio frequency identification of internet of things

A technology of radio frequency identification and absorbing materials, applied in the direction of electrical components, magnetic field/electric field shielding, etc., can solve problems affecting the reliability and accuracy of data reading

Active Publication Date: 2014-06-11
宜宾金原复合材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The system transmits data through radio waves. When radio waves encounter metal or liquid or electromagnetic interference, signal conduction will produce interference attenuation, which will affect the reliability and accuracy of data reading.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Fe powder with a purity of 98.5% and Ni-Cu-Zn ferrite are selected and mixed at a ratio of 1:1 as an electromagnetic interference absorber. The particle size of the powder is in the range of 0.5 microns to 4 microns, and the mixed electromagnetic interference Absorbent through silane coupling agent ( use The amount is 0.5% of the weight of the electromagnetic interference absorber) after surface treatment, chlorinated polyethylene is selected as the adhesive, and the weight ratio of the absorber to the adhesive is about 80:20. Mix the absorbent with chlorinated polyethylene, and roll it into a sheet with a thickness of 0.1mm to 0.15mm. Using the network analyzer measurement method, the absorption attenuation of the sheet at 0.1MHz~1GHz is: -5dB~-10dB, and the magnetic permeability υ 1 (at 1MHz) is: 45, the sheet is pasted on the RFID label with double-sided tape, and under the condition that the label has interference (there is a metal object on the back of the label,...

Embodiment 2

[0025] Ni-Zn ferrite and Fe-Si-Al alloy are selected and mixed at a ratio of 2:1 as the electromagnetic interference absorber, wherein the particle size of the powder is in the range of 0.5 microns to 4 microns, and the mixed electromagnetic interference absorber is passed through After the surface treatment of titanate coupling agent (amount of 1.0% of the weight of the electromagnetic interference absorber), select polyurethane resin, whose weight is 10% of the absorber, dissolve with ketone or benzene organic solvent, and stir with the absorber In the form of a paste, it is coated into a 0.5mm thick shielding absorbing film by screen printing. After drying, it is measured by a network analyzer. Conductivity υ 1 (at 1MHz) is: 30. The sheet is pasted on the RFID tag with double-sided tape. Under the condition of tag interference (metal object on the back of the tag, strong electromagnetic reflection), the effective communication distance is 90% of that without interference. ...

Embodiment 3

[0027] Fe-Mg-Zn-Cu soft magnetic ferrite and Fe-Si alloy are selected and mixed at a ratio of 1:4 as the electromagnetic interference absorber, wherein the particle size of the powder is in the range of 0.9 microns to 10 microns, and the mixed electromagnetic interference Absorbent via silane coupling agent (use The amount is 1.2% of the weight of the electromagnetic interference absorber) for surface treatment, and epoxy resin is selected as the adhesive. The weight ratio of the absorber to the epoxy resin is about 95:5, and a 200mm×200mm×2mm sheet is pressed at a pressure of 40MPa. After curing, using the network analyzer measurement method, the absorption attenuation of the 2mm thick wave absorbing plate at 0.1MHz~1GHz is: -10dB~-15dB; the magnetic permeability υ 1 (at 1MHz) is: 80. The composite shielding wave-absorbing film is pasted on the RFID label with double-sided tape. Under the condition of label interference (there is a metal object on the back of the label, str...

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Abstract

The invention relates to a composite electromagnetic wave absorbing material used for radio frequency identification (RFID) of internet of things. The absorbing material comprises an absorbent and an adhesive; the absorbent is composed of a mixture including a soft magnetic ferrite powder with a length of 0.5 micros to 10 micros and a micro soft magnetic metal powder; and the adhesive consists of organic resin, chlorinated polyethylene and silicone rubber and the like. According to the invention, an absorbent is utilized to enable realization of a hysteresis loss of a high frequency (13.56 MHz) electromagnetic wave and an ultrahigh frequency (900 MHz) electromagnetic wave; diffusion and attenuation influences on an electromagnetic wave between particles are combined; and an eddy current loss is formed on a surface of a composite shielding absorber, so that an absorbing performance with specific requirements is obtained. Meanwhile, the absorbing material provided in the invention is suitable for being manufactured into composite absorbing shields with different shapes and different thickness in various modes, thereby meeting requirements of packaging of RFID chips and antennas with different standards.

Description

technical field [0001] The invention relates to an electromagnetic wave absorbing material, in particular to an electromagnetic wave composite absorbing material used for radio frequency identification of the Internet of Things. Background technique [0002] Radio Frequency Identification (RFID) technology is an important part of the Internet of Things, and Radio Frequency Identification (RFID) technology is essentially an automatic identification technology. Usually, the RFID system consists of three main parts: electronic tags, readers and data management systems. The electronic tag consists of an antenna and an RFID chip, and each chip contains a unique identification code, which is used to indicate the object to which the electronic tag is attached. The reader is used to read and write the information in the electronic tag. The reader communicates with other computers or systems through the network to complete the information acquisition, interpretation and data managem...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05K9/00
Inventor 曾华胡健曾朝君黄道平
Owner 宜宾金原复合材料有限公司
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