How to make a transparent, conductive surface for EMC & RF shielding applications?
Transparent EMC shielding film, photo-etched from a copper sheet, makes it possible. We get a copper-wire mesh laminated on a PET sheet, with optical adhesive.
The transparent EMC shielding film can then be laminated on windows or various surfaces (glass, polycarbonate, PET) and insures a high electrical conductivity overall the surface.
What are the applications of anti-wave film (copper micro-mesh) for EMC shielding?
Here are 6 examples!
Transparent EMC/EMI shielding film for a connected fridge (RFID) or automatic inventory cabinet
Le film transparent anti onde est laminé sur la vitre de blindage CEM afin d’assurer une étanchéité électromagnétique et radiofréquence dans l’enceinte du frigo ou de l’armoire. La reprise de masse est assurée directement sur le film, contre le châssis. Des joints conducteurs peuvent-être utilisés pour compenser les jeux mécaniques lors de l’assemblage.
Les ondes électromagnétiques et radiofréquences sont réfléchies et conduites par la surface du film conducteur, puis conduites au châssis relié à la terre.
EMC shielding (RFID) for connected dispensers, fridges or cabinets
Transparent EMC/RF shielding film for meeting room confidentiality
EMC and RF shielding film ensures a global phone or Wi-Fi waves’ proofing (shielding>40dB for frequencies from 10MHz to 10GHz). The room is thus completely sealed from electromagnetic and radio frequency waves, while allowing light to come in thanks to its transparency (>81% for visible light).
The shielding film is also infrared-proofed, protecting the room from thermal cameras.
The micro copper-mesh film can also be used for bigger projects, as to cover openings in buildings (windows or big glass surfaces) for example.
RF and EMC shielding for a confidential meeting room
Transparent EMC shielding film for the safety of medical equipment (CE certified)
The conductive film allows medical devices to be EMC-proofed. Medical monitors screen can thus be shielded so that they don’t radiate electromagnetic interferences within the room. Patient security and surrounding devices reliability is thus ensured.
This EMC shielding film is also used to protect staff during medical imaging operations.Indeed, composed of a micro copper mesh, the film is de facto electromagnetic waves proofed (such as X-ray).
Electromagnetic shielding of a window in a medical imaging room
Transparent EMC shielding film for anechoic chambers (for the tests and EMC qualifications, to be CE compliant)
The EMC shielding film (Cu Mesh) allows the anechoic chambers’ openings to be perfectly EMC- and RF-proofed. It completes the anechoic chamber by allowing the inside of the room to be visible from the outside, without back and forth pollution.
Anechoic chamber for EMC qualifications
Transparent EMC shielding film for on-field military equipment’s protection
On-field military forces can be detected thanks to radio-frequencies or electromagnetic emissions. Equipment brought on the field can radiate such waves. For the forces to be invisible, the equipment have to be perfectly EMC-proofed.
The EMC shielding film is laminated onto screens or armored vehicles’ windows. With its high conductivity, it ensures the EMC and RF shielding of all openings, while ensuring a high transparency for the staff.
The shielding film is also infrared-proofed, making equipment totally invisible from thermal cameras while keeping its permeability to the visible spectrum waves.
Electromagnetic shielding (EMC) of a screen on on-board military equipment
Transparent EMC shielding film for electromagnetic certification of display screens
This EMC shielding film is an invaluable ally in the EMC standards certification stages for CE certification. It provides a complete seal against electromagnetic waves (EM) and radio frequencies (RF) while ensuring permeability in the visible spectrum (>81%).
This is why this shielding film is widely used for shielding signalling equipment and digital displays.
Electromagnetic shielding (EMC) for a display screen
Microscopic view of the copper mesh of the EMC shielding film (Cu Mesh)
How does this anti radiofrequency (RF) and electromagnetic (EMC) wave film work?
The manufacturing process for this film is fairly straightforward. The copper film is laminated onto a PET backing. The assembly is then photo-machined to remove the material in precise, regular locations. The result is a microscopic copper mesh (copper wire width: 21μm, copper mesh size: 255μm).
The electrical surface resistance is around 0.1Ω/square. This very low surface resistance is a direct result of the raw material used: raw copper.
The resulting shielding film is laminated with an optical adhesive, then with protective liners on both sides. The copper surface is also treated to ensure that it does not oxidise over time.
This Cu Mesh shielding film (for the MFHP reference) is manufactured in rolls 1,500mm wide. It can then be manufactured in lengths of several dozen metres or even hundreds. The roll of material can then be cut in width and length to deliver the most suitable film formats for your application.
EMC shielding film: Microscopic photo-minished copper mesh
What is the difference with ITO-based EMC shielding film?
The oldest technology for transparent electromagnetic shielding is ITO (Indium Tin Oxide). These are metal particles that are sprayed onto a PET surface in a very thin layer. These particles provide conductivity on the surface of the film.
These ITO films have several disadvantages:
– The resistivity is very high compared with a copper mesh: >100 Ohms/square.
– Oxidation resistance is very low. After a few years, the ITO film yellows and/or retains fingerprints. This phenomenon is due to the oxidation of the projected metal particles.
– The quality of ITO films is extremely variable. Depending on the particles used and the manufacturing process, the quality and price vary greatly without guaranteeing excellent results over time.
– Mechanical strength is less good with ITO film. This type of film is more likely to scratch or break during handling or application. This has a direct impact on the quality of the resulting EMC shielding.
For these reasons, several studies show that the market for metal micro-mesh film is set to grow, while the ITO market is shrinking.
You can find an infographic on this phenomenon on the Fieldscale website.
How do I know if this transparent EMC shielding film is suitable for my electromagnetic shielding project?
We have several samples available (A4 or larger) which we can send you within 24 to 48 hours. To take advantage of this, send us a message via the chat (bottom right) or via the contact form at the bottom of the page.
Go to the technical specifications of the transparent EMC shielding film (Cu Mesh)
EMC shielding film: Microscopic photo-minished copper mesh