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Common mobile digital equipment such as cellular
phones, digital cameras and personal computers
both emit and are exposed to GHz band electromagnetic
noise.
Conventionally, ferrite products have been used
to prevent internal circuit malfunction or unnecessary
external electromagnetic emission.
However, ferrite chips are not adequate to control
all problems associated with GHz band level high
frequency noise.
As the importance of noise-countermeasure products
increases, environmental consideration, thinness
and high performance are required simultaneously
for noise suppression sheets.
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| Measured result of frequency
dependency in complex relative permeability |
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| Displays high magnetic permeability
in both real (μ’) and imaginary
(μ”) parts over a broad spectrum
from 30 MHz to 5 GHz, consequently effectively
attenuating surrounding noise magnetically. |
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| Noise Suppression
Sheet |
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Noise suppression
in cellular phones, digital cameras, car navigation
systems, laptop PCs, PDAs, etc. |
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Suppression of radiation noise
and transmission noise in electronic equipment
as well as measures against internal interference
and malfunction |
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Reduction of SAR level in cellular
phones |
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| Characteristics |
Heat
Resistant Type |
Standard
Type |
| Type
Notation |
FN1 |
FN3 |
| Effective
Frequency(GHz) |
0.03
to 5 |
| Thickness(μm) |
60,100 |
35,60 |
| Sheet
Dimensions(mm) |
200 × 300 |
| Usage
Temperature Range (°C) |
-25
to +100 |
-25
to +80 |
| Relative
Density |
Over
2.5 |
| Surface
Resistivity(Ω/□) |
Over
106 |
| Detail |
Excellent
heat resistance as well as resistance to
fatigue from flexing |
Roll
type also available |
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* Please
contact us about the thickness and dimensions of
sheets not shown in this chart.
* Figures above
are neither standard
nor guaranteed values. |
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Permeation
loss in the noise suppression
sheet was measured using a micro-loop
antenna circuit with the measurement
system on the left.
Permeation attenuation depends
on the sheet thickness. |
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Transmission
loss in the noise suppression
sheet was measured using a micro
strip-line circuit with the measurement
system on the left.
Offers excellent transmission
noise absorption characteristics
at high frequency (500 MHz).
Is especially effective for attenuating
harmonic noise in the microwave
band. |
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Field intensity of leaked electromagnetic
wave is measured with the same sampling method as
for the transmission loss measurement.
The suppression effect of our sheet is confirmed
in the high-frequency region above 500 MHz. |
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