The antenna direction can influence shielding range of cell phone jammer

The antenna direction can influence shielding range of  cell phone jammer .Because the shell wall opposite sign induced charge them with any point q in the shell space to stimulate the co-field strength is zero. which will not be within the shell conductor outer shell or other field of charge q impact of the induced charge from the outer shell of automatic regulation, if the cavity above the ground conductor casing, the casing on the induction of positive charge along the ground wire into the ground. static equilibrium conductors and earth equipotential cavity, the cavity field Strong is still zero if a charge cavity, the cavity remains and to other potential conductor, conductor no electric field.  cell phone jammer  has passed the strict testing of Testing Center for Quality of Security & Police. At this time there are different numbers for cavity wall induced charge, so the empty cavity electric field this field by the shell of charge generation, charge on the shell outer shell still no impact on the electric field by the above discussion we can see, both closed-shell ground conductor or not, charge the internal electric field outside the shell is not affected. b. Ground shell external electric field is not closed conductor shell charge grounding conductor closed shell effects of the external electric field from the charge of the shell.Confirm the power supply switch of  cell phone jammer is in the off position
Grounding conductor closed-shell external electric field from the charge of the shell if the shell cavity with charge q, because of electrostatic induction, shell wall with the same amount of opposite sign charge , outer shell with the same number of equal charge, the shell exists outside the space field, this field can be said that the charge q indirectly by the shell can also be said that the charge induced by the outer shell directly, but if the chassis ground, the charge is outside the shell will disappear, and the inner wall of the shell charge q induced charge generated electric field is zero outside the shell. Electronic Product under the Ministry of Public Security of P.R. China Indices and technologies of  cell phone jammer are on the world’s advanced level.See if the charge on the shell to make the shell had no effect on the external electric field, the shell must be grounded. This is the first situation is different. here and pay attention: ① We will remove ground outer shell, said the charge, but does not mean that in any case are certainly not charged outer shell and if live outside the body shell, the shell wall may still be charged, regardless of whether the shell charge.  cell phone jammer  is recommended to be installed around every examination room.