The imported patent main control chip design used by cell phone jammer belongs to proprietary intellectual property right

Please do not load the battery inverse in the cell phone jammer
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 sixth of the wavelength range over time, wave resistance does not change, constant at 377. 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. Near-field reflection loss can be calculated which r: the distance between the wave source and shielding.The imported patent main control chip design is also used by the cell phone jammer. SE formula the last one is the correction factor B, is calculated as B = 20lg [-exp (-2t / σ)] This equation applies only to the magnetic field environment in recent absorption loss 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 a negative number indicates that the decline in shielding efficiency. Only EMI suppression strategies such as metal and iron materials like magnetic high to very low frequencies to achieve high shielding efficiency. 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.The imported patent main control chip design used by cell phone jammer belongs to proprietary intellectual property right. In summary, the choice for the magnetic shield of high conductivity is very complex, often to the EMI shielding materials, suppliers and the relevant advisory body to find a solution. 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, there is no gap or gap (to form a Faraday cage). However, in practice, to create a seamless and shield gap is not possible, because the shield is divided into multiple parts to be produced, so there will need to splice gap, another usually have to punch in the shield cast Installation and connection cards or assembly components. The repair rate of this mobile phone jammer is lower than 1%.The difficulty lies in the shielding design of the manufacturing process inevitably produce pores, and operation of the equipment will need to use these pores. Manufacturing, panel connections, vents, windows and external monitoring panel mounted components must all be cast in the shield hole, thus greatly reducing the shielding performance. Although the groove and the gap is inevitable, but in the shielding design of the circuit operating frequency wavelength for careful consideration of the length of the groove is very good. Frequency electromagnetic waves of any wavelength: wavelength (λ) = speed of light (C) / frequency (Hz) when the gap length is wavelength (cutoff frequency) of the half, RF waves began to 20dB/10 octave (1 / 10 cut-off frequency ) or 6dB / 8 octave (1 / 2 cut-off frequency) of the rate of decay.