The material of the cell phone jammer appearance

The material of the cell phone jammer appearance
(X in the high-frequency electric field, the use of thin metal shell or lining material as a good shielding effect can be achieved, but on condition that the shield must be continuous and completely cover the sensitive parts, no gaps or cracks (forming a Faraday cage ),
EMI suppression, isolation and the low sensitivity of the circuit designer should be a goal of all these properties early in the design phase should be completed. Design engineers, the use of shielding materials is an effective method to reduce EMI. Pioneer mobile phone jammer company has well reputation and top-ranking after service.Shell now has a variety of shielding materials are widely used, from metal cans, thin metal sheet and foil to the fabric or the conductive coating and spray coating wear volume (such as conductive paint and zinc wire spray, etc.). Whether it is coated with a conductive layer of metal or plastic, once the designer to determine the material before it as a shell, you can get started select the pad. Available shielding efficiency (SE) of the shield to assess the suitability of its unit is dB, calculated as A: absorption loss (dB) R: Return Loss (dB) B: correction factor (dB) (for thin shield memory in the case of multiple reflections) a simple shield will make the resulting electromagnetic field strength down to one-tenth of the original, SE equal to 20dB; that some situations may require the reduced field strength per 100,000 for the initial a, SE to be equal to 100dB.Mabell cell phone jammer firm relies on powerful technological resource. Absorption loss is the electromagnetic energy loss through the shield when the amount of loss calculation for the absorption of copper permeability σ: conductivity of copper t: thickness of the shield reflection loss (near field) electromagnetic wave generation source depends on the nature of and with distance from the wave source. For rod-shaped or linear transmitting antenna, the more recent wave from the wave source the higher the resistance, and then with increasing distance from the wave source and down, but the plane wave resistance did not change (constant 377). Conversely, if the wave source is a small coil, the magnetic field at this time will be mainly from the wave source, the lower the more recent wave drag. Wave drag and wave source as the distance increases, but when the distance of more than six points short wavelength, wave resistance does not change, constant at 377.Mabell cell phone jammer company relies on professional management. Reflection loss and shielding wave impedance ratio of resistance changes, so it depends not only on the type of wave, but also on the shield and the distance between the wave source. This applies to small shielded equipment. This equation applies only to the magnetic field environment in recent absorption loss is less than 10dB, and the situation. As the shield of the absorption efficiency is not high, the internal reflection will pass through the shield and then the other side of the energy increases, so the correction factor is negative, indicating that only mask the decline in the efficiency of metal and iron and the like, such as high magnetic permeability material to at very low frequencies to achieve high shielding efficiency.Mabell cell phone jammer company relies on technological research team. Permeability of these materials will increase as the frequency decreases, while if the initial magnetic permeability also make a strong decrease, there is a mechanical method to make provision for the shield shape also reduces permeability. In summary, the choice for the magnetic shield of high conductivity is very complex, usually EMI shielding materials to the supplier and the relevant advisory body to find a solution.