EMI Absorber Sheet

EMI Absorber Sheet

  • EMI-Microwave-Absorber-Sheet-1
  • EMI-Microwave-Absorber-Sheet-2
  • EMI-Microwave-Absorber-Sheet-3

Overview

  • Absorber sheet is used to reduce overlap and interference of the radio waves (For EMI solution) or prevent interference of antennas (For NFC, RFID) by attenuating the reflection or transmission of electromagnetic waves.
  • Able to absorb electromagnetic waves from 10MHz to 6GHz frequency bands.
  • It is made in roll, sheet, band form and various shapes can be processed according to the applications.

Features

  • RoHS Compliant, Halogen Free, UL94-V0
  • High permeability up to 300 μ'
  • Non-electrical conductive
  • Possible to manufacture EMI and NFC solutions both
  • Thickness of 30㎛ ~ 500㎛ is possible.
  • Adhesion to the sheet surface makes it easy to attach to the inside of the device.

Magnification pictures of absorber surface and section
  • EMI-Microwave-Absorber-Surface-Magnification

    300 times magnification of surface

  • EMI-Microwave-Absorber-Section-Magnification

    1000 times magnification of section


Details for EMI Solution (SRA Series)

Sheet Type (Low Permeability)

Specifications
Part No. SRA461 SRA47 SRA48 SRA31 SRA61 SRA62 SRA63 SRA410
Structure Single layer
Frequency Band 10MHz ~ 6GHz
Permeability [μ'@3㎒] 50 80 100 130 100 130 150 100
Thickness [㎛] 30~500 30~300 10
Temperature [℃] -30~85 -30~100 -30~85
Density [g/㎤] 3.6 3.7 3.7 3.7 3.1 3.4 3.6 3.5
Thermal Conductivity [W/mK] 0.5
Hardness [Shore A] 90 95 90
Tensile Strength [kgf/㎟] 4 3 1
Elongation [%] 5 2 4
Surface Resistance [Ω/□] > 1 x 106 > 1 x 105
Eco-friendly RoHS, Halogen free
Flame Class UL94-V0
Size Standard 210㎜ x 300㎜
Maximum 350㎜ x 640㎜


Sheet Type (High Permeability)

Specifications
Part No. SRA35 SRA34 SRA331 SRA36 SRA37 SRA617*
Structure Single layer
Frequency Band 10MHz ~ 6GHz
Permeability [μ'@3㎒] 160 190 210 250 300 170
Thickness [㎛] 30~500 30~300 30~200
Temperature [℃] -30~85 -30~150
Density [g/㎤] 3.8 4.0 3.8
Thermal Conductivity [W/mK] 0.5
Hardness [Shore A] 90 95
Tensile Strength [kgf/㎟] 4 8 3 10
Elongation [%] 5 6 2 3
Surface Resistance [Ω/□] > 1 x 106 > 1 x 104 > 1 x 106
Eco-friendly RoHS, Halogen free
Flame Class UL94-V0 UL94HB
Size Standard 210㎜ x 300㎜
Maximum 350㎜ x 640㎜

* SRA617: Possible to process reflow soldering up to 260℃



Permeability
  • Graph-Permeability- SRA3x-SRA4x
  • Graph-Permeability-SRA6x


Reflection Loss
  • Graph-Reflection-Loss-SRA3x-SRA4x
  • Graph-Reflection-Loss-SRA6x


Roll Type (EMI Solution)

Specifications
Part No. SRA71R SRA72R SRA73R
Structure Single layer
Frequency Band 10MHz ~ 6GHz
Permeability [μ'@3㎒] 100 80 60
Thickness [㎛] 35 ~ 150
Temperature [℃] -30 ~ 85
Density [g/㎤] 2.5
Thermal Conductivity [W/mK] 0.1
Hardness [Shore A] 80
Tensile Strength [kgf/㎟] 5
Elongation [%] 2
Surface Resistance [Ω/□] > 1 x 106
Eco-friendly RoHS, Halogen free
Flame Class UL94-V0
Size Standard 300㎜ x 20M
Maximum 350㎜ x 100M


  • Permeability
    Graph-Permeability-SRA7x
  • Refection Loss
    Graph- Reflection-Loss-SRA7x

Details for NFC Solution (STA Series)

It is attached between NFC/RFID/WPC antenna and metal plate* to ensure recognition distance or improve charging efficiency.


Specification

Contents Sheet Type Roll Type
Part No. STA11 STA81R
Structure Single layer
Frequency Band 10MHz ~ 6GHz
Permeability μ’@13.56㎒ 55 40
μ”@13.56㎒ < 2 < 2
Thickness [㎛] 30 ~ 500 35 ~ 150
Temperature [℃] -30 ~ 85
Density [g/㎤] 3.9 2.8
Thermal Conductivity [W/mK] 0.5 0.1
Hardness [Shore A] 90 80
Tensile Strength [kgf/㎟] 4 2
Elongation [%] 5 8
Surface Resistance [Ω/□] 1 x 106
Eco-friendly RoHS, Halogen free
Flame Class UL94-V0
Size Standard 210㎜ x 300㎜ 300㎜ x 20M
Maximum 350㎜ x 640㎜ 350㎜ x 100M

* Metal Plate: When the outermost part of the cell phone battery is made of metal, the electromagnetic wave transmitted from the NFC reader may generate Eddy currents on the metal surface, causing problems such as NFC communication disturbance and recognition distance decrease. In this case, it can be applied between antenna and metal to prevent communication trouble and increase the recognition distance between devices.



Permeability

Graph-Permeability-STA.jpg

Applications

  • EMI-Microwave-Absorber-on-Heat-Source

    Direct attachment on noise source

  • EMI-Microwave-Absorber-for-Cable

    Absorber in communication cable

  • EMI-Microwave-Absorber-on-PCB

    Attaching on partial area of PCB surface


  • EMI-Microwave-Absorber-on-Antenna

    Attaching on antenna of mobile phone

  • EMI-Microwave-Absorber-for-Ferrite-Core

    Replacing noise filter

  • EMI-Microwave-Absorber-Band-on-FFC

    Band type absorber wrapping over FFC