There is two main ways to make a transparent EMI shielding window.
ITO film is a metallized PET film (a thin layer of metal is sputtered on a PET layer).
This EMI shielding technology is exposed to long term oxidation due to the manufacturing process (the film may switch to yellow or keep finger prints).
ITO film for transparent EMI shielding has low EMI shielding performance (mainly above 10Ω/□). This EMI shielding level can be a problem for demanding applications (as military, RFID integration or medical projects).
ITO film is also mechanically fragile, precautions should be taken during lamination process.
Cu Mesh Film is a photo-etched copper foil laminated on a PET layer (0,1mm total thickness).
Thanks to the copper conductivity, this transparent EMI shielding film has high performances (below 0,2Ω/□).
Its mechanical structure ensures good mechanical properties and no breaking during lamination process.
This film is manufactured in roll of 1 500 mm width and tens of meter long to cover big windows.
The manufacturing process to make this transparent EMI shielding film has imporved since last years.
No more bus bar or grounding strips are required thanks to the high electrical conductivity on any point of the EMI shielding windows.
Previous manufacturing processes required tooling cost for each size of EMi shielding window. This is not the case anymore. The film is directly laminated on any support and at any dimensions.
A protective layer is put on the EMI shielding film to ensure a high protection level against oxidation.
Transparency is a key point when talking about EMI and RF shielding for windows.
We are aware of it, and worked to propose an opening rate below 150 OPI (Openings per Inch) ensuring a transparency over 80%.
Using photo etching process to make this microscopic Cu Mesh, the result is only a pale brown layer for an EMI shielding level over 50dB.
Keeping a high electrical conductivity level and keeping transparency on the same time is the key challenge of proposing a transparent EMI shielding film for windows.
The raw copper material used to make the film ensures a high electrical conductivity on the whole surface of the EMI shielding windows.
No more bus bar or grounding strips are required thanks to the high electrical conductivity on any point of the EMI shielding windows.
The Cu Mesh film ensures an electromagnetic shielding over 50dB on the main EMI frequencies.
From 30MHz to 6GHz, EMI sheidling is over 40dB. and over 50dB from 30MHz to 1GHz.
This film is used as well to make electrical equipment invisible on military operations (no electromagnetic detection by radars).
But also on medical rooms, to protect medical staff and equipment from electromagnetic fields.
This EMI shielding film is also widely used in industrial projects as RFID inventory or in anechoic chambers.
We deliver the film ready to use (laminated with an optical adhesive).
We also propose turnkey EMI shielding windows. We laminate our film on glass or polycarbonate supports, ready to be assembled.
The lamination process is made in clean rooms to ensure a high optical quality and no dust or defaults on the final EMI shielded windows.
All delivered EMI shielding windows are guaranteed without optical defect and strickly protected during transportation.
We can take care of the transport until your production site.
Extended know-how in Electro-Magnetic Compatibility (EMC) since over 30 years.
Providing engineering support and parts in demanding and various projects (automotive, military, medical, industry, telecom, aerospace).
Supplier of technical components, standards and tailor made from prototyping to mass production for the biggest industrial actors all over the world.
Part of ICE Groupe, representing 1 000 collaborators and for more than 120M€ turnover.
This Cu mesh film is widely used for EMI and RF shielding window by our main customers.
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