No signal when the phone is placed in a shielded cabinet?
The mobile phone shielding cabinet is made of metal material. The electromagnetic wave signal of the mobile phone is blocked and attenuated after passing through a certain thickness of metal. In addition, the surface of the mobile phone shielding cabinet is usually plated inside, and the surface electrostatic spraying will absorb and weaken the electromagnetic wave signal to a certain extent. The weakening of the electromagnetic wave signal means that the connection between the mobile phone and the communication base station is weakened, so as to achieve the purpose of the jammer mobile phone signal.
The working principle of the mobile phone is that within a certain frequency range, the mobile phone and the base station are connected by radio waves to complete the transmission of data and sound with a certain baud rate and modulation method.
The shell with high electrical conductivity, or high magnetic permeability, generates an induced current when electromagnetic waves are radiated to weaken the electromagnetic waves that the radiation enters. The decay rate is related to the conductive/magnetic properties.
However, sometimes due to factors such as the distance between the mobile phone and the nearby communication base station, the material and thickness of the shielding cabinet itself, although the mobile phone signal will be weakened to a certain extent, the effect of completely shielding the mobile phone signal cannot be achieved. Complete shielding is impossible.
Cell phone signals are electromagnetic waves. The thickness of the metal can also attenuate incoming electromagnetic waves according to the thickness.
Whether it can be shielded by the shielding cabinet depends on the material and thickness of the shielding cabinet, the distance from the base station, the power of the base station and the jammer gps frequency used.