Flexible EMI Absorber Sheets

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Flexible EMI Absorber Sheets

Flexible EMI absorber sheets 5780

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

The Flexible EMI Absorber Sheets were developed for electromagnetic-wave absorption and noise suppression. It is designed to eliminate noise and solve EMC/EMI problems by simply attaching the noise-suppression sheets on the parts that are sources of noise.

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 ohms)
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 / Smart phones / Phablet
Wireless equipment
EMI-shielding box / Dark box
Between printed circuit boards
On ICs, processors, and controllers
On cables that need high flexibility

Various types of flexible EMI absorber sheets

Flexible EMI absorber sheet can be bent easily around a cable (optionally available as a tube)

Part numbers and characteristics:

Properties	Unit	5780-C1	5780-C3	5780-C5A	5780-C5B	5780-C7
Operating temperature	°C	-40 ~ +85	-40 ~ +85	-40 ~ +85	-40 ~ +85	-30 ~ +120
Applicable frequency	GHz	1 MHz ~ 18 GHz	1 MHz ~ 18 GHz	1 MHz ~ 9 GHz	1 MHz ~ 9 GHz	1 MHz ~ 3 GHz
Relative permeability (μ’@1MHz)	–	25	50	150	250	140
Material	–	Magnetic powder + rubber	Magnetic powder + rubber	Magnetic powder + rubber	Magnetic powder + rubber	Sintered ferrite
Thickness range	mm	0.12 – 2.50	0.25 / 0.50 / 0.75	0.05 – 0.50	0.05 / 0.50	0.08 / 0.12 / 0.22
Max. dimension	mm	600 x 400	600 x 400	210 x 297 (A4)	210 x 297 (A4)	130 x 130
Surface resistance	Ohm	10⁶	10⁶	10⁵	10⁵	10⁹
Density	g/cm3	3.6	4.8	4.4	4.4	3.8
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

Usage examples

Example 1: Wrapped around a cable

Example 2: Applied to a flat cable

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

Example 4: Applied between integrated circuits

Example 5: Applied to case and between boards

EMI-enclosure solutions using only EMI-shielding tape or with EMI absorbers

EMI enclosure solutions using only EMI-shielding tape

EMI enclosure solutions using EMI-shielding tape and EMI absorbers

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

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

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.

Permeability characteristics

Methods of measurement

5780 EMI flexible absorber sheets, power loss measurement

5780 EMI flexible absorber sheets, reflection loss measurement

Insertion loss

5780 EMI flexible absorber sheets Insertion loss

Return loss (1 MHz ~ 3 GHz)

5780 EMI flexible absorber sheets Return loss (1MHz ~ 3GHz)

Return loss (3 GHz ~ 18 GHz)

5780 EMI flexible absorber sheets Return loss (3GHz ~ 18GHz)

Choosing the right EMI flexible absorber sheet

Item	5780-C1	5780-C3	5780-C5A	5780-C5B	5780-C7
Economical	Best	Good	Poor	Middle	Middle
Operation temperature	-40 ~ + 85 °C				-30 ~ + 120 °C
Material	Magnetic powder + rubber				Sintered ferrite
Relative permeability (μ’@1MHz)	25	50	150	250	140
Thinnest version	0.12 mm	0.25 mm	0.05 mm	0.05 mm	0.08 mm
Thickest version	2.50 mm	0.75 mm	0.50 mm	0.50 mm	0.22 mm
Surface resistance	10⁶	10⁶	10⁵	10⁵	10⁹
RoHS 2.0 compliance	2011/65/EU
Halogen free	No		Yes
Best application	RFID/NFC	EMI, RFID/NFC	EMI, RFID/NFC wireless charger (no magnet type)

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Flexible EMI Absorber Sheets