Flexible composite electromagnetic wave absorbing material applied to sensing radio frequency identification for internet of things

Abstract

The invention provides a flexible composite electromagnetic wave absorbing material applied to sensing radio frequency identification for internet of things. The flexible composite electromagnetic wave absorbing material comprises the following components in percentage by mass: 60%-95% of composite anti-electromagnetic interference absorbent particles and 40%-5% of an adhesive, wherein the composite anti-electromagnetic interference absorbent particles are formed by mixing, drying and dispersing of 0.1-40 microns of soft magnetic metal particles and soft magnetic levitation liquid, of which the volume ratio is (60%-70%) to (40%-30%); the soft magnetic levitation liquid is formed by stirring and mixing of an organic bridging material which is diluted until the viscosity is within the range of 100-300mPa.s, and surface-activated composite particles; and the volume ratio of the organic bridging material to the composite particles is (90%-95%) to (10%-5%). Through the organic bridging material, the effects on an electronic tag caused by electromagnetic interference under various environments are reduced to the minimal extent; impedance matching of the electromagnetic wave absorbing material and an electronic tag antenna is improved; and the frequency offset phenomenon caused by encapsulation of the wave absorbing material is solved, thus the read reliability of the tag and the compatibility of actual use of the tag are ensured.

Description

technical field

[0001] The invention relates to an electromagnetic wave absorbing material, in particular to a flexible electromagnetic wave composite absorbing material used for sensing 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 ...