Noise Suppression / Electromagnetic Wave Absorption Sheet
Thin, Light, and Flexible Electromagnetic Countermeasure Film
The FJM series is an ultra-thin film with special conductive layer developed and mass-produced by Fujiko.
It aims to suppress unwanted electromagnetic waves (noise) generated inside electronic devices and reduce electromagnetic waves from communication, sensors, and high-frequency circuits.
A key feature is its compatibility with microwave to millimeter-wave bands, making it an EMC countermeasure material for advanced electronic devices.
Why EMC Countermeasures Are Important
Recent Changes in Electronic Devices
- High-speed communication (5G/millimeter wave)
- Circuit miniaturization and high performance
- Increased sensor use in automotive, medical, and industrial applications
Typical Problems Caused by Electromagnetic Interference
- Communication errors and reduced sensitivity
- False detection and malfunction of sensors
- EMC standard non-compliance due to radiated noise
- Reduced measurement accuracy due to radar reflected waves
Basic Structure of FJM Series
- Surface protective layer / Adhesive layer
- Optional / Can be added according to application
- Special conductive layer (resistive film)
- Non-metallic ultra-thin conductive layer
(approx. 1.7-4.0μm) - Base film
- Mainly PET film (12μm/50μm/75μm, etc.)
Layer Structure Diagram (Cross-section Image)
The FJM series has a multi-layer film structure.
This structure attenuates electromagnetic waves as heat.
Difference Between Noise Suppression and Electromagnetic Wave Absorption
The FJM series has two main applications.
① Noise Suppression Sheet
Main purpose:
Enhance radiation suppression effect through impedance matching
- Attenuate unwanted electromagnetic waves (spherical waves) generated inside electronic devices
- Suppress electromagnetic waves generated between circuits
- Countermeasures around communication cables and connectors
② Electromagnetic Wave Absorption Sheet
Main purpose:
Suppress excessive reflection and unwanted electromagnetic waves
- Attenuate electromagnetic waves in the high-frequency region
- Adjust radar sensitivity and gain
- Design possible to attenuate specific wavelength and broadband frequencies
Main Features of FJM Series
POINT 01
Broadband Compatible
(3GHz-20GHz, 20GHz and above)
Can cover up to millimeter-wave band.
Designed to accommodate future high-frequency trends.
POINT 02
High Attenuation Effect
Achieves attenuation effect of 10dB or more across a wide band, not just specific frequencies.
POINT 03
Non-metallic /
Ultra-thin Conductive Layer
Lighter and more flexible than metal foil.
Less concern about metal fatigue and resistant to thermal shock.
POINT 04
Ultra-lightweight /
Flexible
Weight reference: approx. 7g/m²
Easy to conform to curved and bent surfaces
Very easy-to-handle material for automotive and small devices.
Main Application Examples
Electronic Device Field
- Radiated noise countermeasures
- Around communication cables and connectors
- Interference prevention inside modules
Communication /
Wireless Field
- High-frequency communication equipment
- Noise reduction around antennas
- Various high-frequency radars
Product Introduction
Want to reduce radiated noise
Noise Suppression Sheet
Wide compatibility from microwave to millimeter wave
Want to suppress reflected waves and radiation itself
Electromagnetic Wave Absorption Sheet
Broadband Absorption Type
Wide compatibility from microwave to millimeter wave
Curved surfaces and weight reduction are important
Electromagnetic Wave Absorption Sheet
Specific Wavelength Absorption Type
Optimized for targeted frequencies such as radar applications
Material and thickness can be adjusted according to application
In most cases, specifications are narrowed down after hearing about application, frequency band, and installation position.