This paper analyses in depth conductors shield prin ciple, points out it is different from electrostatic shield of conductor, and ex plains why fibre transmission possesses more credibility.

• 从理论上深入地分析了导体对电磁波的屏蔽原理，指出它和静电屏蔽的区别并说明为什么光纤传输更具可靠性。