Keep the cell phone jammer far away from fire brand

When the interference source is the voltage generated by the form of interference, the interference with electronic equipment, the electric field between the capacitive coupling exists, can be regarded as distributed capacitance between the coupling. Keep the    cell phone  jammer   dry and any liquid is prohibited to penetrate into it. To eliminate or suppress such interference, to conduct field shielding. The design should comply with the following principles:
1) as close as possible to shield the protected material, and ground the shield must be good;
2) The shielding effect is good or bad and the shape of the shield has the most direct relationship. If the shield can be made of closed metal box is best, but also in engineering practice according to the actual circumstances of the case;
3) the material is necessary to shield a good conductor as well, there is no strict requirements on the thickness, as long as there is sufficient strength can be. In practice, again according to the electrostatic field and electric field alternating electric field separately. Keep the    cell phone  jammer far away from fire brand.Electrostatic field is rare in reality, the shielding means to take a more grounded metal shield approach, the alternating electric field shielding in interference between the source and sensitive circuitry to set a good conductive properties of the metal shield and metal shield grounding The purpose is to reduce the alternating electric field coupling to sensitive circuits interference voltage. Usually alternating electric field coupling to sensitive circuits interference voltage alternating electric field depends on the voltage, the coupling capacitors and metal shield grounding resistance of the product. Please keep the very side of    cell phone blocker stuck with mark of product model facing to the area needs to be shielded.Just try to make well-grounded metal shield, can make the alternating electric field coupling to sensitive circuits interference voltage becomes very small.
This paper starting from the principle of shielding, the electric field, magnetic field and electromagnetic shielding techniques are introduced.
Principle 1 shield
Shielding is the use of the shield (with specific properties of the material) to prevent or attenuate electromagnetic interference energy transfer channels, thereby suppressing electromagnetic interference. Shield has two purposes: limit leakage of internal radiation of electromagnetic energy; to prevent interference from external radiation to enter. Covering the vent of    cell phone  jammer   is strictly prohibited. Due to shield the electromagnetic interference from external electromagnetic waves are spread within the play to absorb energy (eddy current loss), the reflected energy (electromagnetic waves in the interface reflection on the shield) and offset energy (electromagnetic induction in a reverse electric field shielding layer, can offset part of the electromagnetic interference) effect, so it has less interference function. According to shield shield works can be divided into the following three categories: field shielding, magnetic shielding and electromagnetic shielding.