Amorphous Shielding

About Noise Suppression Sheet Materials

The need for more compact and multi-functional electronic devices requires a large number of electronic components to be mounted on PCBs (Printed Circuit Boards) with extremely high density. The emitted noise by the ICs and cables is becoming increasingly important. During product design it is difficult to estimate emissions requiring noise suppression. A solution that is easily implemented is to use flexible noise suppression sheets, which can be punched and cut, and processed into various shapes, including high permeability nanocrystalline tapes for locations which are susceptible to noise emissions.

Our Noise Suppression Sheets and tapes materials are available for low frequency Magnetic 50Hz to 100kHz noise, to EMI noise in the 100MHz to 6GHz range. These are flexible sheets, tapes and films which, depending on the frequency range of noise suppression needed, are composed of different materials and constructions.

Technologies Available

  • Ultra-thin 18µm nanocrystalline ribbon between layers of PET film.
  • Sheets of Nanocrystalline power and resin.
  • Flexible polymer blended with micron-sized magnetic powder
  • Polymer sheets filled with soft magnetic materials.

Nanocrystalline Magnetic Shielding

This is a series of thin and flexible magnetic shielding sheets made of high permeability nanocrystalline ribbon, laminated with PET films to form Nanocrystalline Magnetic Shielding. The sheets are thin, light weight and flexible, and easy to handle. They have superior magnetic shielding effect especially in frequencies below several 100kHz.

One layer can shield about 100µT and multiple layers can shield strong magnetic fields. Bending, cutting and punching has only a small deterioration in shielding effect. This allows the material to be applied on curved surfaces and cut or punched into various shapes. Rolls are suitable for large-scale magnetic shields such as in a shielding room.

Construction

Material Thickness
PET film 25 µm
Hot-melt adhesive 25 µm
Nanocrystalline ribbon 18 µm
Hot-melt adhesive 25 µm
PET film 25 µm
Total thickness 0.12 mm

Specifications

Type Rolls Sheet
Length up to 100 m 610 mm
Width 470 mm 460 mm
Product code F1AH0535 F1AH0607
P/N MS-FR 470-100M-T0 MS-F SD-460×610-T0
Thickness 0.12 mm
Magnetic flux density,B800 DC H=800A/m 1.23 T
Maximum permeability, µmax (DC) 70,000

Shielding Effect of Magnetic Field at 50Hz

Thickness of grain-oriented Si (Silicon) steel in the above chart corresponds to one layer of M6 or approximately three layers of M4. For toroidal transformer magnetic shielding is applied to the OD of the transformer.

When Si steel is used it is the same as the transformer core material. M6, which is 0.35 mm thick, or M4 which is 0.27 mm thick (3 layers are applied), which equals 0.81mm approximating 0.7mm in the above chart.

Shielding effect of DC magnetic field

 

Applications

Nanocrystalline Magnetic Shielding has an extremely good weight to noise suppression ratio, making it an excellent choice to mitigate the magnetic noise generated from inductors in electronic devices, which are easily affected by magnetic fields or fluctuating magnetic fields. It is also used for magnetic shielding of buildings adjacent to power lines or power distribution installations.


Nanocrystalline EMI Suppressor Sheet

Halogen-free noise suppression sheet with flame retardance composed of high performance nanocrystalline soft magnetic material. The nanocrystalline material is powered and bonded together with resin and formed into sheets. These sheets have high suppression effect on radiation noise and feature excellent complex relative permeability, resulting in high suppression of radiation noise in the range from 0.1 to 10 GHz.

Sheets are flexible and easy to handle, punch and cut in various shapes. They can even be applied to curved surfaces.

Applications

Highly effective in suppression of radiation noise and cross-talk noise in multilayered circuit boards in various electronic devices, flexible flat cables or on the internal or external surface of a chassis containing digital devices.

Specifications

Shape A4 Sheet Rolls
Size (mm) 210mm x 297mm 300 mm x 20m 330 mm x 20m
Thickness 0.13 mm 0.25 mm 0.50 mm 0.13 mm 0.25 mm 0.50 mm
Product code F1AH0946 F1AH0948 F1AH0950 F1AH0943 F1AH0944 F1AH0945
P/N K-EK013 210-297-T0 K-EK025 210-297-T0 K-EK050 210-297-T0 K-EK013 300-20M-T0 K-EK025 300-20M-T0 K-EK050 300-20M-T0
Density (103kg/m3) 3.5 x 103kg/m3
Complex relative permeability (at 1GHz) µr'' 8
Complex relative permeability (at 1GHz) µr'' 12
Tensile strength (MPa) 1.5 Mpa
Surface resistivity 1 X 109 Ωm
Flame retardance V-0
Operating temperature V-40 to +85 ℃

Ferrite EMI Suppressor Sheet

Thin 0.05 to 0.1mm flexible ferrite EMI suppressor sheets are polymer sheets filled with soft magnetic materials, which offer the highest magnetic permeability of 185µ' at 3MHz and applicable frequency range 100MHz to 6GHz. These are offered in standard roll widths of 210mm x 297mm and come in Halogen Free versions.

Type NS-HD NS-H NS-L NS-B NS-K NS-J NS-S NS-G
Permeability ( at 3MHz) 25 30 45 70 100 130 150 180
Applicable Frequency 500MHz ~ 6GHz 300MHz ~ 6GHz 100MHz ~ 6GHz 100MHz ~ 6GHz
Operating Temperature ℃ -25 ~ +105
Standard Thickness (mm) 0.05 ~ 0.1
Standard Size 210mm x 297mm, roll type available
Volume Resistivity (Ω•cm) 1 x 108
Remarks High Freq. Low Freq. Low Freq
Halogen Free available.
 
 

Ferrite EMI Suppressor Film

High frequency noise suppressing thin flexible polymer sheets filled with soft magnetic materials. Permeability at 3MHz ranges from 20µ’ to 50µ’ and appliable frequency range 100MHz to 3GHz. Standard thickness of 0.05 to 0.1mm which are offered in standard roll widths of 210mm x 297mm.These also come in Halogen Free versions.

Type NS - F NS - FA NS - FAL NS - FR
Permeability ( at 3MHz) 20 20 50 50
Applicable Frequency 100MHz ~ 3GHz
Use Temp ℃ -25 to +85 ℃
Standard Thickness (mm) 0.05 ~ 0.1
Standard Size 210mm x 297mm, roll type available
Volume Resistivity (Ω•cm) 1 x 1012
Remarks o Thin type of high frequency noise. o Halogen Free available. o Function of noise absorbing and shielding o Halogen Free available. o Thin type of low frequency noise. o 1000mmx200M.

RF Induction Sheet

A series of flexible soft magnetic materials, which are designed to enhance communication distance of NFC systems and to improve power transfer efficiency of wireless power charging systems. Permeability at 13.56MHz ranges from 25µ’ to 55 µ’ with thickness of 0.1 to 1.0mm. Standard rolls are 210mm wide with lengths up to 15 meters.

Type Permeability at 13.56MHz Thickness Standard size Frequency
μ' μ'' (mm) (mm)
RF-B 55 1.0 to 1.5 0.1 to 0.5 210x297 13.56MHz
RRF-L 45 1.5 to 2.0 0.2 to 1.0 210x297
RF-H 45 1.0 to 1.5 0.2 to 1.0 210x15M

Typical applications for RF Induction Sheets are used to increase communication distance of NFC systems (near field communication) or to enhance power transfer efficiency of WPCs (wireless power chargers).


Microwave Absorber

Thin 0.05 to 0.1mm flexible ferrite EMI suppressor sheets are polymer sheets filled with soft magnetic materials, which offer the highest magnetic permeability of 185µ' at 3MHz and applicable frequency range 100MHz to 6GHz. These are offered in standard roll widths of 210mm x 297mm and come in Halogen Free versions.

Type MA-C MA-X MA-K MA-W
Frequency 4-6GHz 8-13GHz 21-26GHz 75-110GHz
Attenuation -20dB -20dB -20dB -5dB
Type Resonant Broadband
Operating Temperature -50 to 150 ℃
Thickness 1.5 to 3.0 mm
Standard Size 300x300 mm

These can be used for Electronic Toll Collection to improve ETC communication environments (5.8 GHz), reduce RCS of military vessels (8-12 GHz) or for Collaboration Detection and Prevention Systems, to reduce internal (cavity) resonance by isolating antennas from ground plane reflections (24, 77 GHz).