Can a cell phone signal block a classroom?

Important admissions, qualifying or final exams require cell phone jammer to block electronic signals around exam rooms and prevent possible electronic cheating.

So, how large can the cell phone signal blocker block the test room? Can a test room only use a shielding device to achieve shielding purposes? How many screens should be used in a teaching building?

First of all, we need to know: there is a theoretical shielding range of mobile phone jammers in the examination room, which is about 0-20 meters in radius. However, please note that this is a theoretical distance, and the actual effect should be combined with the local signal strength, especially if there is a signal base station nearby. If there is a signal base station within 200 meters, the shielding effect will be compromised.

In addition, walls can weaken the jammer's shielding effect. Closer to the window, because the signal is stronger, the shielding is weaker.

The standard classroom of the school is 75 square metre or so commonly, each classroom configure a screen implement can obtain better result. Can be placed in the middle of the classroom, can be the largest range of shielding, of course, this should be combined with the power line to determine. It is also common to place screens on the podium.

If there is a larger classroom or a base station nearby, two shielding devices can be placed in each classroom, one before and one after. As the shielding signals are superimposed and enhanced, a better effect of 1+1 > 2 can be achieved.