Who invented the mobile jammer?how to manage cell phones in the classroom?

In 1999, Tang Tai led a technical team in his laboratory and successfully developed the first how to manage cell phones in the classroom in China. This is a technical research team composed of teachers and students of Tsinghua University. Its founder is Tang Tai. This powerful thing with four tentacles is a mobile cell phone jammer that will be installed in some college entrance examination examination rooms by the examination management department. In the summer of 6 years ago, my country's first mobile phone shielding instrument was born here.

To crack the mobile phone jammer to let the mobile phone signal, we must first understand its principle:
Mobile phone signal jammers are divided into omnidirectional and directional types according to the shape of the shield. The omnidirectional type is an olive shape, and the directional type is a fan shape. Therefore, the omnidirectional jammer is better than the directional mobile phone. The shielding area of ​​the device is large;
how to manage cell phones in the classrooms to generate certain electromagnetic waves to interfere with the downlink of its mobile signal. If the power of the jammer is greater than the power of the local mobile signal, then the mobile phone will have no signal. If the power of the jammer is less than the power of the local mobile signal, the mobile phone There will be a signal.
So the way to crack the jammer is to install a mobile phone signal amplifier.

There are many key places to prohibit the use of mobile phones, such as trade secret enterprises, key conference halls, government departments, and key enterprises and other industries where key information must be strictly maintained. Protection equipment is usually installed in such places, and cell phone jammers are used to help prohibition. on the phone. Not only that, with the popularization of smart phones, more and more places will install mobile phone signal jammers, on the one hand, to better maintain the security of information, not to better mobile phones, but also to ensure Discipline in this kind of place, but hang a better Huanpei Installed a mobile phone screen in the library to bring you better reading articles. Huanpei's conference hall is equipped with a mobile phone exhibition alliance to ensure the confidentiality of the meeting content and information It is not easy to be cut off by the mobile phone ringtone.