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FSS (Frequency Selective Surface)-based Electromagnetic Interference Shielding Film

FSS (Frequency Selective Surface)-based Electromagnetic Interference Shielding Film
for Wireless LAN

Mitsubishi Cable Industries has developed and commercialized a variety of electromagnetic wave absorbers for the ETC (Electronic Toll Collection System)-related applications as well as directivity improvement for communications offset dishes. Now, Mitsubishi Cable Industries focuses on radio wave environments made by the introduction of wireless LAN network and its periphery in offices and housing complexes that connects society.
In communications through the medium of radio waves such as the wireless LAN, we have the advantage of ubiquitous environment however, the-disadvantages would be security issues such as radio interference or information leaks. In order to achieve a comfortable radio communication environment, proper use of electromagnetic shielding material will be essential.
Nevertheless, even within an environment shielded from outside, free use of other wireless appliances such as mobile phones, PHS and so on, should be secured.
Therefore, radio waves, other than that of wireless LAN applications, should remain unshielded. Also, today there are various standards for wireless LAN, and as either radio waves in the 2.45GHz or 5.2GHz frequency band is used according to system specifications, it is necessary to shield radio waves in both frequencies at the same time.
Currently Mitsubishi Cable Industries has proceeded to develop an electromagnetic shielding film to shield radio waves selectively in multiple frequency bands.

Example of use

Pre-production sample of an electromagnetic shielding film for dual frequencies sharing, as shown in Figures 1 and 2, is a product that an array of TY type antenna element is printed with a conductive coating on PET (Polyethylene Teleftarate) film.
By arranging the TY type antenna elements in a hexagon, it causes the elements with different sizes (with different frequencies applied) to coexist on the same surface enabling a selective shield of radio waves in multiple frequencies.
Also, by changing the size of the elements, it is possible to apply other frequency bands

Application

  • 800MHz band and 1.5GHz band for mobile phones
  • 1.9GHz band for PHS
  • 5.8GHz band for DSRC(Dedicated Short Range Communication)

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