Can a metal mesh suspended in the air shield radar waves? That is to say, the metal mesh has no grounding conductor.
If the metal net is a closed system, the electromagnetic wave can not enter the closed system, so the shielding effect is formed. If the metal mesh is not a closed system, due to the diffraction effect of electromagnetic waves, or some of the electromagnetic waves around the metal mesh to enter, the shielding effect is poor
In fact, if the metal mesh is not grounded, the electric field to the region, it is still able to form an electric field on the earth, the formation of new electromagnetic waves, therefore, metal mesh grounding, shielding effect is better. Metal shell shielding refers to the outside of the electromagnetic wave in the outside, does not interfere with the shell of the electronic device, the electromagnetic wave shielding inside the shell will not let out!
Electromagnetic wave is made up of the electric field and the change of the magnetic field, the change of the magnetic field to produce electric field, the change of the electric field to produce magnetic field, the two are indispensable, otherwise can't spread. The metal net is made of conductive metal, when the air field formed around the metal net, because of the short circuit effect of conductive metal, destroyed the electric field formation (ideally conducting medium zero resistance, short circuit electric field is completely absent). Based on the above two points, after the electromagnetic wave arrives at the metal mesh, the electric field disappears, and the magnetic field can not be continued.
