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Conductive composition for low frequency emi shielding

一种组合物、混合物的技术，应用在分散在不导电无机材料中的导电材料、磁场/电场屏蔽、电路等方向，能够解决不能提供足够屏蔽有效性等问题

Active Publication Date: 2020-11-03
HENKEL KGAA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

High conductivity alone does not provide sufficient shielding effectiveness for EMI shielding at this MHz level

Method used

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  • Conductive composition for low frequency emi shielding
  • Conductive composition for low frequency emi shielding
  • Conductive composition for low frequency emi shielding

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0123] volume resistance

[0124] figure 1 Exemplary shapes used to define the term "volume resistance" are shown.

[0125] R=ρL / S[Ω, ohm]

[0126] ρ: at 25°C, with a length of 1 m and a cross-sectional area of ​​1 mm 2 The (volume) resistivity of the conductor.

[0127] Volume resistance: ρ=RS / L[μΩ m, μohm.m, 10E-4ohm.em]

[0128] Agilent 34401A digital multimeter, Gen Rad 1689 Precision RLC Digibridge were used in the measurement.

[0129]A special four point probe test fixture is made of acrylic material with four spring loaded contact points. Set the contacts into the acrylic so that the current contacts are two inches (5.08 em) apart, the voltage contacts are between two current contacts, and the voltage contacts are 0.5 inches (1.27 cm) from each current contact .

[0130] Sample Preparation:

[0131] Two rolls of 3M Magic Scotch Tape were loaded into the jig 0.1" (0.254 cm) apart.

[0132] Slide a cleaned glass slide with two parallel Scotch tapes 0.1" (0.254 c...

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Abstract

This invention relates to conductive compositions for low frequency EMI shielding. The EMI shielding composition of the present invention comprises a resin (comprising a thermoplastic resin and / or a thermosetting resin), a solvent and / or a reactive diluent and particles, wherein the particles comprise a mixture of magnetic particles and conductive particles or coated with a conductive material Magnetic particles or a mixture of magnetic particles coated with a conductive material and conductive particles, wherein the composition comprises > 10% by weight of magnetic particles based on the total weight of the composition. The EMI shielding composition of the present invention has good electrical and magnetic conductivity and is suitable as a direct technical solution for EMI shielding over a wide frequency range, and especially at low frequency ranges.

Description

technical field [0001] This invention relates to conductive compositions for low frequency EMI shielding. The composition of the invention has good electrical and magnetic conductivity and is suitable as a drop-in solution for EMI shielding over a wide frequency range, and especially at low frequency ranges. Background technique [0002] Electromagnetic interference (EMI) shielding is required for a variety of radio frequency (RF) electronic components primarily used in wireless communications. [0003] The most common EMI shielding solution is to use a metal cover or can to cover the target area or component. However, this technical solution cannot meet the continuously increasing demand for miniaturization (thinner and thinner packaging), smaller footprint and higher packaging density of electronic components. Therefore, this solution cannot be used in some micro-devices due to the excessive space required by the metal cover / cover. [0004] One industry approach is to u...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05K9/00C09K3/00
CPCH05K9/0083H01L23/552H01L23/66C09K3/00H01B1/22H05K9/0088
Inventor 黄晨宇严丽黎吴起立何锡平L·姚
Owner HENKEL KGAA
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