Completion of installation of cell phone jammer

cell phone jammer     can work when pressing the switch of power supply after finishing connecting the equipment.  Predict the shielding effectiveness of below 4.2 will apply this algorithm to predict the shielding effectiveness of box analysis, that the shielding effectiveness and the hole size, the angle of the incident. In this paper, holes of different sizes, different incident angles, the application of modified matrix pencil algorithm for simulation analysis, the shielding effectiveness versus frequency curve. Width of the hole were taken 2mm, 5mm, 7mm simulation, shown in Figure 4-1. Analysis shows that: When the hole width is 7mm, in 0 ~ 600MHz low-frequency range, the shielding effectiveness is 27 ~ 40dB. Anti-interference ability, good shielding effect. Shows that the metal box with holes on the low frequency signal has good shielding ability. When the frequency of the resonant frequency of 715MHz, the shielding effectiveness of the smallest box, equipment cabinets at this time the most vulnerable to outside interference.The cell phone in the shielding range will lose signal from the base station for    cell phone jammer .
Therefore, the actual design of the box, you should avoid important components of electronic devices placed in the vicinity of sensitive resonant frequency band, band-stop filters can also be used to eliminate high frequency near the resonance frequency interference. Comparison of three curve analysis: When the hole width is constant, the frequency increases, the shielding effectiveness decreases. This is because the frequency increases, leading to smaller wavelengths, so the electromagnetic wave is relatively easier to enter through the small hole inside the shield, and then produce electromagnetic interference. At the same time, you can see: the same frequency, the smaller the width of the hole, the greater the shielding effectiveness; the width of the hole bigger, the smaller the shielding effectiveness, shielding effects worse.
Used for cabinet doors, covers or lap joint of the connection. (4) conductive foam lining conductive foam lining with a low pressure, and good shielding effect. Its shielding effectiveness can be more than 90dB. High sensitivity of the equipment can be used to shield areas. When the waves encountered when conductive foam lining objects according to their nature of reflection and absorption, but also the equipment play a buffering effect, therefore, to achieve better shielding effect. 4 conductive particles of conductive particles is particles (such as silver-plated glass particles, silver particles, carbon black particles, nickel-silver particles, silver particles of aluminum, nickel-plated graphite particles, etc.) incorporation into the silicon Among silicone rubber or fluorine, and then squeeze out the wide variety of shapes.Switch on the power of    cell phone jammer after completion of installation of    cell phone jammer    . Silica gel inside the shielding material for electromagnetic waves of electromagnetic radiation to reduce, eliminate, its function and the metal mesh screen similar to the electromagnetic waves penetrate the shield in the energy absorption loss when the main -27-- caused mainly due vortex. Vortex on the one hand have the opposite magnetic field to offset the original interference field, which is mainly used in magnetic and vapor sealing, shielding effectiveness as shown in Table 4-7. 4.1.2 shielding effectiveness of electronic equipment box technical specifications of electronic equipment cabinet screening requirements: shielding effectiveness SE <30dB, that shield poor. Shielding effectiveness at 30 ~ 60dB, indicating good shielding effectiveness. In 60 ~ 90dB shielding effectiveness, the shielding can be applied to military equipment. If more than 90dB shielding effectiveness, indicating the shielding effect is excellent, so the shield can be used in high-precision, highly sensitive products.