Filter for segmenting power lines for communications

1. A method for blocking a portion of energy of a signal in a power line, comprising:

equipping a high frequency magnetic core with a coil;

connecting a capacitor across terminals of said coil to create a resonant circuit that resonates at a frequency of said signal, wherein said resonant circuit is a first resonant circuit having a first frequency band blocking characteristic;

placing said magnetic core around said power line at a location where said blocking is desired; and

performing said equipping, said connecting and said placing to provide a second resonant circuit tuned to a different frequency than said first resonant circuit to create a second frequency band blocking characteristic that is wider than said first frequency band blocking characteristic.

2. The method of claim 1 , wherein said core includes an air gap.

3. An apparatus for blocking a portion of energy of a signal in a power line, comprising:

a first high frequency magnetic core with a first coil;

a first capacitor connected across terminals of said first coil to create a first resonant circuit that resonates at a frequency of said signal, and has a first frequency band blocking characteristic, wherein said first high frequency magnetic core is placed around said power line at a location where said blocking is desired;

a second high frequency magnetic core with a second coil; and

a second capacitor connected across terminals of said second coil to provide a second resonant circuit tuned to a different frequency than said first resonant circuit to create a second frequency band blocking characteristic that is wider than said first frequency band blocking characteristic.

4. The apparatus of claim 3 , wherein said core includes an air gap.