Everyone has studied physics in junior high school and senior high school, and everyone knows that metal produces an effect called "electrostatic shielding". What is "electrostatic shielding"?
The outer shell of a conductor plays the role of "protecting" its interior from external electric field, which is called electrostatic shielding.
Seeing this, it seems that ... the metal shell will affect the cell phone signal, which is true!
But ... is it just the metal shell that causes electrostatic shielding?
Since the iphone4, Apple phones have used metal frames to make them antennas. If the metal shell has an effect on the signal, what is Apple doing?
The metal case that comes with the iphone has no effect on the signal. People are still antennas, so our metal shell will affect the signal?
Have you ever seen Joe Wang release the iphone4?
I remember Joe Wang once said when he showed the iphone4, why are there several black lines in the stainless steel case? Attention, this is the detail!
Then Joe Wang said, let's make the shell of the iphone an antenna! The audience is sensational!
The detail is the black line first mentioned by Mr. Joe Wang, and the metal shell mentioned is the antenna! You can watch the release video at that time!
Why not say that the metal shell is an antenna first? Why mention those black lines? And put it in front of the shell antenna?
Hehe, of course Apple knows about electrostatic shielding!
Electrostatic shielding has a premise, that is, there must be a closed loop! Simply put, it is a circle! Or a ball!
Don't talk about the metal cover ... because according to the theory of calculus, the cover is made up of circles (math knowledge, whatever, you can intuitively see that the cover is also a ring)
And those black lines are just the dividing lines that will break this cycle! Only a few black wires separate the three antennas of the iphone. These three antennas are very close, but because they are completely insulated from each other, they will not form electrostatic shielding because there is no loop! Even if it looks like a circle again, he is not!
All right, back to the metal shell, you understand?
If it is a real metal case, it will definitely have an impact on the mobile phone signal, and how much impact is beyond the scope of discussion.
If it's just a circle in appearance, there are actually other insulators blocking this circle, even if it's just a crack!
There will be no electrostatic shielding, and it will have no effect on the cell phone signal!
I hope that when you buy a metal shell, try to choose a shell that has no effect on the signal. Even if there is, you can think that it is easy to transform it!
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