An electromagnetic pulse protection circuit having wave filtering
functions, composed of an LEMP protection circuit and a fast response
protection circuit, and a filter is series-connected on a signal
transmission route, and is utilized to provide impedance in effectively
preventing electromagnetic pulses caused by lightning (LEMP) or other
electronic weapon (NEMP, HEMP, PEMP) interferences. In addition, it is
capable of suppressing electromagnetic pulses at specific frequencies,
thus, raising the capability of electronic elements in resisting against
electromagnetic pulses. Furthermore, said filter is made of
high-temperature-super-conduction (HTSC) material, so that when said HTSC
material of said filter is subject to a sudden infusion or invasion of
said electromagnetic pulses, it is switched to a high impedance state in
a very short period of time in effectively restricting currents passing
through said filter, hereby avoiding the damages of a communication
system.