Mabell cell phone jammer firm has superior after-service

But 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 cast the shield Additional drilling to mount and assemble the components of the line card or shield of the difficulty lies in the design of the manufacturing process inevitably produce pores, and operation of the equipment will need to use these pores. Mabell cell phone blocker company has perfect supply and sell channels.manufacturing, online panels, vents, external monitoring window and panel-mount 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 of the trench length as carefully is very good considering the frequency of 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 frequency waves began to 20dB/10 (1 / 10 cut-off frequency) or 6dB / 8 octave (1 / 2 cut-off frequency) of the rate of decay, usually the higher the attenuation of RF transmitter frequency the more serious because of its shorter wavelength. When it comes to the highest frequency, must be consider any harmonic may occur, but in fact only consider the first and second harmonic can be. Once you know the radiation shield inside the RF frequency and intensity, we can calculate the maximum allowable gap shield and trench Mabell cell phone jammer company has powerful market support.For example if you need to 1GHz (wavelength of 300mm), the radiation attenuation 26dB, then the 150mm gap will begin to decay, so when the gap when there is less than 150mm, 1GHz radiation will be attenuated, so in terms of frequency of 1GHz, If you need attenuation 20dB, then the gap should be less than 15mm (150mm 1 / 10), need to 26dB attenuation, the gap should be less than 7.5mm (15mm 1 / 2 above), requires attenuation 32dB, the gap should be less than 3.75 mm (7.5mm to 1 / 2). (i can be a suitable conductive pads to limit the size of the gap within the specified size, in order to achieve this attenuation effect. shielding design difficult because the shield joints turn will lead to a decline in Mabell cell phone jammer  group works according to open, cooperative and win-win principles.Therefore, shielding efficiency will be reduced, pay attention to below the cutoff frequency of the radiation attenuation depends only on its diameter than the length of the gap, such as length to diameter ratio of 3 available 100dB attenuation in the hole when needed, can be used above the thick shield holes of the waveguide properties; another to achieve a high length to diameter ratio method is to attach a small metal shielding material, such as an appropriately-sized pad above principle and in the promotion of multi-seam cases constitute the basis of porous shield design porous thin shielding layer: porous many examples, such as thin sheet metal air vents, and so on, when the closer spacing of the holes when the design must be carefully considered. Mabell cell phone jammer  firm has superior after-service.The following are such cases shielding efficiency formula which fc / o: cut-off frequency n: number of holes note that this formula applies only to the hole spacing is less than the diameter of the case can also be used to calculate the relevant metal braid shielding efficiency joints and contacts: welding, brazing or soldering is between thin common way of permanently fixed, occupies a position of metal surfaces must be clean, to make the joints completely filled with a conductive metal is not recommended for fixed with screws or rivets, fasteners because of the low resistance junction between the contact state is not easily sustainable.