Each set of the cell phone jammer has its own characters

Each set of the cell phone jammer has its own characters
Transceiver for wireless devices, the use of non-continuous spectrum can be part of the EMC performance, but many of the examples also show that EMC is not always able to do. For example, in notebook computers and testing devices, printers and desktop computers as well as between cellular phones and medical equipment and so on between the high frequency interference, such interference we called electromagnetic interference (EMI). This technology of cell phone jammer avoids the recession of blocking distance.EMC problems, the source of all electrical and electronic equipment, will have intermittent or continuous voltage and current changes, sometimes quite fast rate of change, this will result in a different frequency bands within or between the electromagnetic energy, this will be the corresponding circuit kinds of energy launched into the surrounding environment. EMI has two ways to enter or leave a circuit: radiation and conduction. Signal radiation through the shell slit, slot, hole, or other gaps leak; and signal transduction through the coupling to the power supply, signal and control lines to leave the shell, in an open space free of radiation, resulting in interference. The aluminium textured outer shell of cell phone jammer is excellent in thermal diffusivity.EMI suppression have adopted many shell shield and shield gap as the way to achieve, most of the time following these simple principles can help to achieve EMI shielding: at the source to reduce interference; through shielding, filtering or ground isolation circuit to generate interference and enhance sensitive circuits, such as anti-interference ability. 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.People selected and put the high-performance patch component to use in  mobile phone jammer. 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. Shielding efficiency of shielding effectiveness of metal available (SE) of the shield to assess the suitability of its unit is dB, calculated as SEdB = A + R + B where A: absorption loss (dB) R: Return Loss (dB) B: correction factor (dB) (for thin shield of memory in the case of multiple reflections) will make a simple shield the electromagnetic field generated by one-tenth of the first down, that SE is equal to 20dB; some situations may require field strength will be reduced for the first one hundred thousandth of that SE should be equal to 100dB.High-performance integrated circuit has been used in this cell phone jammer. Absorption loss is the electromagnetic energy loss through the shield when the amount of absorption loss calculation for the AdB = 1.314 (f × σ ×?) 1 / 2 × t where f: frequency (MHz) μ: permeability of copper σ: conductivity of copper t: thickness of the shield reflection loss (near field) electromagnetic wave generation source depends on the nature of the distance with 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).