spectrum density of phone jammer

There is a situation requires special attention, this is the wave magnetic field below 1kHz. Turn onphone jammer after installing the fifth antenna. This general magnetic wave generated by the high-current sources, for example, high-current power transmission lines, power transformers, etc. for this very low frequency magnetic field, only high-permeability shielding material, commonly used material is about 80% nickel permalloy. 2 holes and cracks of the electromagnetic leakage and Countermeasures

General In addition to low frequency magnetic field, the majority of metallic materials can provide more than 100dB shielding effectiveness, but in practice, common situation is made of metal shield, and not so high shielding effectiveness, and even almost no shielding effectiveness, which is because many designers do not understand the electromagnetic shielding of key.
First, you need to know is electromagnetic shielding and shield grounding or not does not matter. cell phone jammer is an ordinary hand-held instrument. This is different from the electrostatic field shielding, the electrostatic, as long as the shield ground, we can effectively shield the electrostatic field, while the electromagnetic shielding and shielding are body grounding or not has nothing to do, which is to be clear.

Electromagnetic shielding of the two key points, a conductive shield is to ensure continuity, that the shield must be a complete, continuous conductor. phone jammer can be used for building blocking. Another point is that the conductor can not have through the cabinet for an actual case , these two are very difficult to implement.
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