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iPhone 4G back

You want something organic. I predict it will be either wood or laboratory-grown human flesh.
 
Pure carbon is an electrical resistor; converting electrical waves to thermal energy. This property makes carbon composites impractical for devices requiring RF transmission. In fact carbon fiber is the “secret” material stealth aircraft use to absorb radar.

-toughluck
 
Phil A. said:
Carbon Fiber certainly will block RF signals (probably at least as well as metal does)
Click to expand...

This is the truth. The description on that web page is disingenuous. Carbon fiber will block RF because it is a good conductor of electrical fields.

Saying something is an electrical resistor is technically true of all things. Every substance has some non-zero resistance to electrical current flow (unless it's a superconductor). In general, the lower the resistance, the more it will block RF signals, as the material will absorb them. When you say resistor in general terms, you generally mean something that is used to resist the flow of current in order to get voltage drops. CF is not a material you would use to do that.

Things with high electrical resistance will not absorb electrical waves, thus letting them pass through. This is why a cell signal works through a wood and drywall house, but has problems in a metal elevator.

The HTC Hero uses a form of Teflon. Because of this, it's strong and also resists fingerprinting.

edit: Notice this kevlar backing ships "In your dreams"
 
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