The program of mainly using large-power cell phone jammer

Frequency of 315MHz for high-frequency signals,Ls>> Rs, it is Rs negligible. Vortex increases with the frequency increases, indicating that high-frequency magnetic shielding should be used in conductive materials. Then eddy size can be simplified to I s = MI Ls, eddy size and frequency-independent, that is, with increasing frequency eddy current increases to a certain extent, the shielding effect increases with frequency but not enhanced. For     cell phone jammer    shielding in a prison or supervising area, no matter whether the cellular distribution of small-power     cell phone jammer   , or the program of mainly using large-power    cell phone jammer and complementarily using small-power     cell phone jammer    to supplement the dead angle is adopted, several cell phone signal shielding positions will be installed in the whole prison zone. As the high-frequency skin effect, eddy current shielding shell surface only in the thin layer flow, for which high-frequency shielding in the design of the shell, you do not do very thick. r 3 equivalent electronic circuit diagram of a mask, in accordance with the principles of best value for money, tin and aluminum, zinc is the most cost-effective electromagnetic emission materials [5]. Taking into account the volume of the alarm device to the size and cost factors widespread popularity, in the emitter circuit shielding, the experimental method to test multi-layer aluminum foil with appropriate shielding transmitter, the signal pick-up and pre-processing and transmission circuit effective isolation to electromagnetic compatibility purposes, while allowing transmission circuit can work effectively within the normal range. IV Conclusion by anti-touch alarm system transmission and distribution lines shielded transmission circuit analysis can be seen in screen technology in order to achieve good results, should be based on the actual situation of interference sources, took a different approach.If there are too many sets of     china cell phone jammer , especially after many buildings in the prison implement shielding, it is harder to switch on or off centrally or uniformly. In theory, high-voltage low-current electric field interference can be regarded as sources of interference; and low-voltage high-current sources of interference can be regarded as magnetic interference. In the electric field, emission depletion should constitute a major factor in shielding; in low-frequency magnetic field, due to multiple reflections of the relationship between absorption loss shielding constitute a major factor; and electromagnetic shielding and absorption loss should be considered in emission depletion [6]. Any source of interference is not a pure form of electric or magnetic field, in practice, should focus on identifying the main sources of interference caused by the type of interference on the screen in order to take targeted measures.
Lightning shielding
A sense of intrusive lightning and the lightning-caused by lightning electromagnetic pulse field and the main road to two forms of coupling effects equipment. Shielding to reduce dry
Interference (field form) of the basic measures. Because the use of absorbed or reflected by metal shield method
Attenuation can be applied to the device electromagnetic interference and over-voltage energy.
The so-called shield absorption is through the metal shield and lightning protection equipotential bonding system.Working status and fault condition of     cell phone jammer    are hard to be known.
The shield into the ground with vent deflectors, grounding and physical potential, equivalent to vent into the ground.
The so-called shield reflection, is the lightning electromagnetic waves in transmission lines, often encounter lines.
Sudden change in the way, for example, lightning electromagnetic waves from the wave impedance of overhead lines into a larger.
Wave impedance of the cable and the small middle or end of the access line resistance, inductance, capacitance or.
Linear components (which is known as the lumped parameter), lightning electromagnetic parameters of mutation in the side.
Boundary refraction and reflection, theory can be proved that the reflection and refraction can be applied attenuation.