What is an active protection, elementary: mike or receiver of the signal - an amplifier, 1 transistor - a capacitor with changeable resistor - an output on speaker or emitter.

• 频率范围超过100千兆赫，采用材料反射体屏蔽，具有高介电常数，导磁性，水或镁7分水作为遮盖金字塔，填充物---一个吸收器---石墨,碳。也可以建造积极保护方式电容器。