Flexible EMI absorber sheets

flexible emi absorber sheets icon 1

Series

Specify the width in mm.
Specify the length in mm.
Specify the desired thickness. The options can be found in the table.

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.

Material structure
flexible emi absorber sheets 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 (1 MHz to 18 GHz)
  • 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
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 (Ω) 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 0.08/0.12/0.22 
Max. Dimension   600 x 400 mm  600 x 400 mm  210 x 297 mm (A4) 210 x 297 mm (A4) 130 x 130 mm  
Application examples
Flexible EMI absorber sheets example

Example 1: Wrapped around a cable

Flexible EMI absorber sheets example

Example 2: Applied to a flat cable

Flexible EMI absorber sheets example

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

Flexible EMI absorber sheets example

Example 4: Applied between integrated circuits

Flexible EMI absorber sheets example

Example 5: Applied to case and between boards

Permeability ( µ = µ’ – j µ’’ )
Flexible EMI absorber sheets permeability
 The variation of response frequency when RFID tag + 5780 + metal (Reference)
Flexible EMI absorber sheets response frequency

The response frequency is become lower when 5780 thickness become thick but the signal strength with little difference.

Flexible EMI absorber sheets response frequency

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
Flexible EMI absorber sheets effect diagram

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
Flexible EMI absorber sheets effect diagram

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
Flexible EMI absorber sheets effect diagram

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
Flexible EMI absorber sheets filter effect test
Magnetic Shield / Decoupling Effect Test
Flexible EMI absorber sheets filter effect test
Insertion loss (1MHz ~ 3GHz)
Flexible EMI absorber sheets insterion loss
Return loss (1MHz ~ 3GHz)
Flexible EMI absorber sheets return loss
Return loss (3GHz ~ 18GHz)
Flexible EMI absorber sheets return loss
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