Changzhou Noordin Etech Co., Ltd is a high technological enterprise including the national defense and EMC, specialized in designing, manufacturing and marketing. The enterprise is committed to the application and promotion of EMC technology. It benefits the customers with power line and signal filters within frequency range from 10KHz to 40GHz, insertion loss over 100dB. The products have been widely used in fields of EM shielded room and anechoic chamber, electric locomotive, information security, EMC test, medical instruments, industrial control, measuring system, military application & power driving system etc.