For the cell phone and cell phone jammerindustry

16 Notes on the waveguide end and design of step 1) must not make the conductor through the cut-off waveguide, otherwise it will cause severe electrical leakage, which is a common mistake. 2) make sure to shield the waveguide relative to the frequency is off, and far higher than the cutoff frequency (5 times) the frequency of required shielding.More and more manufacturers lay emphasis on the investment of the cell phone and cell phone jammer market.  Cut-off waveguide design steps are as follows: A) determine the maximum frequency Fmax shielding and shielding effectiveness SE B) to determine the cut-off waveguide cut-off frequency Fc, the fc ≥ 5Fmax C) according to Fc, Fc calculated using the equation waveguide pipe cross-section dimensions d D) according to d and SE, the use of waveguide absorption loss formula waveguide length t Description: In the shield, the different parts of the gap junction formation may lead to electromagnetic leakage. Therefore, in the structural design, you can increase the width of the different parts of the overlap to form a series of "cut-off waveguide", reducing the gap of the magnetic leakage. Cell phone and cell phone jammer market has the large potential, so it can bring large-scale profit. At this time, as the maximum size of the waveguide cross-section spacing between the screws can be used, as the length of the waveguide with the width of overlap, as the cut-off frequency of the waveguide by the calculations to determine the spacing between the screws. When the spacing is larger, the lower cutoff frequency of the waveguide, it may not achieve the majority of disturbance attenuation effect. Panel display device handle 17 on the front panel display device, for 1) small display devices: If the size of a small display devices, can be taken directly to open holes in the panel method, the display device installed in the chassis , the hole bottom. As long as the holes in the panel to open a small (less than 3mm), usually does not cause serious electromagnetic leakage.For the cell phone and cell phone jammerindustry, besides manufacturers, there are lots of agents, retailers and operators.  However, the principle can know the leakage holes, holes from very close sources, the leakage of holes is very serious. Therefore, because the display pieces from the holes close, there may be leakage. At this time, can be planted in a hole on the cut-off waveguide, with a guided light beam. If, for aesthetic or other factors, can not use this method, can be used to isolate the display device and circuit, the circuit to improve the shielding, while the display device exposed. Many chassis to take this approach, the display device installed in a decorative plastic panel. 2) the larger display devices: the need for a larger window to display, then there are two methods. One approach is to use a transparent display window at the shielding material, an alternative method is similar to the above icon, the display device using isolated storage isolated from other circuits, the energy of the internal circuit will not spread radiation chassis, external interference will not invade the internal circuitry. The manufacturers and the agents will have a close and good cooperation relationship for the cell phone and cell phone jammer products. Transparent shielding materials: transparent shielding materials: There are two types of metal mesh sandwiched between two layers of glass composition, the other is on the glass or transparent plastic film coated with a thin conductive layer consisting of . The former material has the advantage of shielding effectiveness of high disadvantage is that because the visual discomfort caused by Moire fringes.