Cell phone and cell phone jammer have the close relationship

The use of computing and simulation using a combination of methods to get the shielding effectiveness, can not consider the environmental electromagnetic interference, and the ratio of electromagnetic [12] shielded test chamber much less investment.
Even with detection capabilities, but also to spend huge sums of money. Therefore, although the actual method of measurement is not the best way possible.
Currently, EMC design because of its significance, the design of electronic products has become a key engineering. During the electromagnetic design, mainly from the circuit, structure, process and installation and other aspects to take effective measures to suppress electromagnetic interference. Electromagnetic shielding (Electromagnetic Shielding) is the electromagnetic compatibility engineering is widely used to suppress electromagnetic interference an important technical measures to solve the problem of electromagnetic interference and effective way. Products from jini  cell phone jammer  company have unique military quality.The basic principle of electromagnetic shielding is cut off in space electromagnetic wave propagation in the energy, so as to eliminate or weaken the purpose of electromagnetic interference. In engineering applications, often shielded means to suppress electromagnetic interference caused the harm. Engineering was the most simple and effective method of shielding is widely used devices in the product plus the shield case, when the electronic equipment in metal shielding body can be a good time to avoid electromagnetic interference. This is to prevent electronic equipment from outside electromagnetic interference, and to prevent leakage of electromagnetic electronic equipment and cause electromagnetic pollution. Shielding effect of electronic products by shielding effectiveness (Shielding Effectiveness) to evaluate, therefore, the calculation of shielding effectiveness is the product of real electromagnetic compatibility considerations, has an important value and significance. Cell phone and  cell phone jammer have the close relationship. In daily life, according to the principle of electromagnetic shielding products developed by many, there is a large substation protection of small room, small chassis with a variety of electronic devices, and their materials, mostly metals, in the process will inevitably lead to gaps in the process of existence. Some devices for cooling and other needs, but also on the case open -2-- some small holes or cracks, such as the design ventilation holes, cable channels and a variety of interfaces corridors. These holes and gaps of the equipment will affect the shielding effect, resulting in the shielding effect is poor, vulnerable to electromagnetic interference. Therefore, when designing electronic products, often because there are apertures result in cabinet poor electromagnetic shielding, thereby affecting the equipment electromagnetic compatibility, can not meet the standards. If, after the appearance of electronic products has been tested and electromagnetic compatibility of non-compliance, the need to spend a lot of manpower and resources to make changes, the possibility of serious scrapped. cell phone jammer  can shield the cell phone signal.  This is not only a waste of time and costly. Therefore, the chassis of the electronic effects of electromagnetic compatibility has attracted widespread attention. Improve the shielding effectiveness of electromagnetic shielding, will help mitigate these issues. This requires a simple test method to ensure that the whole case before the completion of the shielding effectiveness can be more accurate testing and evaluation [11]. Test the shielding effectiveness can be measured using experimental methods, but due to electromagnetic interference and electromagnetic characteristics of the environment itself, the complexity of the experimental test conditions are very harsh testing requirements, which for the use of experimental methods to measure electromagnetic shielding tremendous difficulty. Usually only state-level key laboratories and aerospace, and military research institutes only have the ability to actually test the electromagnetic compatibility. cell phone jammer  can influence the use of cell phone when needed.