flexible emi absorber sheets

EMI absorber sheets 5780

The flexible EMI absorber sheets, developed for electromagnetic-wave absorption and noise suppression, can eliminate noise effectively

The EMI flexible absorber sheets, developed for
electromagnetic-wave absorption and noise suppression, can eliminate noise effectively. EMC/EMI problems are solved by attaching noise-suppression sheets simply on the parts that are sources of noise.


Usage examples

Example 1: Wrapped around a cable
Example 1: Wrapped around a cable

Example 1: Wrapped around a cable

Example 2: Applied to a flat cable
Example 2: Applied to a flat cable

Example 2: Applied to a flat cable

Example 3: Applied to an integrated circuit (IC) top
>Example 3: Applied to an integrated circuit (IC) top

Example 3: Applied to an integrated circuit (IC) top

Example 4: Applied between integrated circuits
Example 4: Applied between integrated circuits

Example 4: Applied between integrated circuits

Example 5: Applied to case and between boards

Example 5: Applied to case and between boards

Example 5: Applied to case and between boards

Material structure

material structure

Features and advantages

  • Very flexible and easy to handle
  • Can be delivered in any shape, size and/or thickness
  • Optionally available as a custom-made tube
  • Can be cut according to the customer’s drawings
  • Provides effective EMI suppression in a wide frequency range (1MHz to 18GHz)
  • Changes the magnetic flux path to avoid interference with other components or surrounding cables
  • Reduces the eddy current when the magnetic flux is close to metal
  • Non-conductive adhesive backing (UL recognized) available
  • Effective in preventing resonance and suppressing coupling
  • High surface resistance (>10⁶ Ω)
  • Easy and fast to process due to self-adhesive

Applications

  • RFID (Radio Frequency Identification) systems
  • NFC (Near-field communication)
  • Wireless power chargers (WPC / Qi)
  • Computers (NB / desktop / tablet) and peripherals
  • Digital Products
  • Mobile phones / smartphones / phablet
  • Wireless equipment
  • EMI-shielding box / black box
  • Between printed circuit boards
  • On IC’s, processors, and controllers
  • On cables that need high flexibility

Permeability ( µ = µ’ – j µ’’ )

EMI absorber sheet Permeability

 The variation of response frequency when RFID tag + 5780 + metal (Reference)

EMI absorber sheet variation of response frequency
The response frequency is become lower when 5780 thickness become thick but the signal strength with little difference.
EMI absorber sheet variation of response frequency 2
The response frequency is increase when metal attached, but the signal strength is smaller if the 5780 thickness is thinner.
It means the metal affect more when the 5780 is thinner.

Effect diagram - Magnetic shield

 Effect diagram - Magnetic shield

5780 EMI flexible absorber sheets can change the magnetic flux path to keep the magnetic flux from affecting other components.

Effect diagram - RFID/NFC on metal

 Effect diagram - RFID/NFC on metal

The magnetic flux induced an eddy current and generated a reverse magnetic field to offset the
magnetic flux to cancel the communication. After attaching an EMI absorber sheet between the metal and the RFID
antenna, the communication recovered.

Effect diagram - Wireless power charger

 Effect diagram - Wireless power charger

5780 EMI Flexible absorber sheets can be used for a wireless power charger to avoid eddy current when the RX coil is attached to metal; this changes the magnetic flux path between TX coil, RX coil, and magnet.

Filter Effect Test

Filter Effect Test

EMI absorber sheet filter effect test

Magnetic Shield / Decoupling Effect Test

Magnetic Shield / Decoupling Effect Test

EMI absorber sheet Magnetic Shield / Decoupling Effect Test
Insertion loss (1MHz ~ 3GHz)

Insertion loss (1MHz ~ 3GHz)

EMI absorber sheet Insertion loss (1MHz ~ 3GHz)
Return loss (1MHz ~ 3GHz)

Return loss (1MHz ~ 3GHz)

EMI absorber sheet Return loss (1MHz ~ 3GHz)
Return loss (3GHz ~ 18GHz)

Return loss (3GHz ~ 18GHz)

EMI absorber sheet Return loss (3GHz ~ 18GHz)

Choosing the right EMI flexible absorber sheet

Item C1 C3 C6 C6b C7
Best Application  RFID, NFC  EMI, RFID, NFC EMI, RFID, NFC, wireless charger (no magnet type) EMI, RFID, NFC, wireless charger (no magnet type) EMI, RFID, NFC, wireless charger (no magnet type)
Material Magnetic powder + rubber Magnetic powder + rubber Magnetic powder + rubber Magnetic powder + rubber Sintered ferrite sheet
Acceptable frequency range  1MHz - 18GHz    1MHz - 18GHz    1MHz - 9GHz   1MHz - 9GHz   1MHz - 3GHz  
Operation temperature -40 ~ +85 C° -40 ~ +85 C° -40 ~ +155 C° -40 ~ +155 C° -30 ~ +120 C°
Permability (µ'@1MHz 25 50 170 250 140
Density (g/cm3) 3.6 4.8 3.8 3.8 3.8
Surface Resistance 106 106 106 106 109
RoHS 2.0 Compliance 2011/65/EU 2011/65/EU 2011/65/EU 2011/65/EU 2011/65/EU
Halogen-Free No No Yes Yes Yes
Thickness (mm) 0.12/0.20/0.25/0.33/0.50/0.6/1.0/1.5/
2.0/2.5
0.25/0.50/0.75 0.05/0.1/0.2/0.3/0.5  0.05/0.1/0.2/0.3/0.5 0.08/0.12/0.22 
Max. Dimension   600 x 400 mm  600 x 400 mm  210 x 297 mm (A4) 210 x 297 mm (A4) 130 x 130 mm  

 

Would you like to...

To get a quotation for Flexible EMI absorber sheets within 24 hours fill in the form below.

Select an option:
C1 : Magnetic powder + rubber
C3 : Magnetic powder + rubber
C6 : Magnetic powder + rubber
C6B : Sintered ferrite
C7 : Sintered ferrite
Specify the width in mm
Specify the length in mm
Specify the desired thickness. The options can be found in the table above.
* Note: The red blocks are required