If we observe carefully everyday, we will find that mobile phones with metal shells cannot be completely made of all metal. They are always more or less hollowed out in some parts, such as those with aluminum alloy shells HTC In the past, some netizens have always said that it is ugly, and there are always one or two plastic patches on the metal back shell. In fact, HTC does not like this design, but rather makes a compromise for the "signal" of the mobile phone. When HTC began not to use metal shells, such as the recently launched 8X and Butterfly The ugly design disappeared. Netizens jokingly claimed that HTC had changed its designer. In fact, it was because the designer did not need to apply a "patch" for the penetration of the "signal" of the mobile phone after changing the phone shell material.

HTC 7 Mozart

So why can't mobile phone signal penetrate metal? The reason is very simple. Metal absorbs electromagnetic waves very strongly, while wifi, 2G and 3G signals have short wavelengths and weak diffraction ability. If the mobile phone is all metal, electromagnetic waves cannot reach the signal receiving module, so there is no way to talk normally. So when we know this reason, should we understand it HTC What about the ugly design?