RF Shielding Solutions

Achieving Specific Absorption Rate (SAR) compliance with important government regulations or to quell the fears of anxious consumers no longer requires compromising between RF energy exposure levels and call quality.  The AgeNT™ RF Shielding Film available exclusively from CHASM is a transparent plastic film, printed with a transparent conductor pattern creating a Frequency Selective Surface (FSS) which redirects RF signals in the frequency ranges commonly emitted by cell phones.  Requiring no wiring or ground plane, the AgeNT RF Shielding film is easy to integrate in both new and retrofit applications.

Radio Frequency (RF) energy surrounds most of us in the modern world on an almost constant basis. This presents challenges from two perspectives. From a human perspective, few people would say that they have absolutely no concern whatsoever regarding the radio waves that play a role in their lives. From a commercial perspective, the engineers that design RF into myriad equipment and the companies that operate them need them to be efficient and cost effective to build and to use.

Considering first the human impact of so much RF energy surrounding us, few researchers have been bold enough to tell people that their cell phone is hurting them.  However, in late 2017, the California Department of Public Health published guidelines for their use. By no means a "smoking gun" it does still give even skeptics reason to give the issue some thought.

From a commercial perspective, it is not unexpected that cost is a major driver. Devices that use RF technology to communicate must do so efficiently while using the least amount of electrical energy possible. If those goals can be achieved while adding an element of safety they achieve the classic "win-win."

RF Energy Redirection is actually a broadly used term for an approach that has for many years played at least some role in the design of antenna systems ranging from the radio telescope to today's cell phone towers: redirect the radio waves where you want them. New materials are making those systems better and making new applications possible.

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Imagine for example a screen protector that actually redirects the RF energy emitted by your smartphone away from your head and towards the cell towers? This is not only possible but now available.

Representative Solution

A client needed a material to enable an after-market screen protector to redirect RF energy away from smartphone users. It is common to laminate multiple layers of glass and plastic films to ensure that a screen protector is not only protective but also provides other enhancements; for example, privacy. What is uncommon, however, is a material that can interact with the RF energy while not disrupting the projected capacitive (PCAP) touchscreen. To accomplish this, CHASM produced a patterned film using a high sheet resistance carbon nanotube ink applied to polyester. The resulting screen protector redirects up to 95% of RF energy away from the smartphone user.

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