Patent ID: 6417762
Filing Date: 2002-07-09
Classification: H04B

Abstract:
A method for carrying a signal in a building power line network that includes a neutral line of the building power line network and a building ground line of the building power line network, wherein the neutral line and the building ground line are capacitively coupled together and connected to an earth ground, the method comprising the acts of:selecting a frequency that is capable of electrically isolating the first line from the second line by creating an anti-resonant condition between the first line and the second line; generating a carrier signal that has the selected frequency with a transmitter that is electrically coupled with the neutral line and the building ground line; applying a first tuning function between the neutral line and a hot line included in the building power line network; and applying a second tuning function between the neutral line and the building ground line, the first tuning function and the second tuning function being selected to increase the capacitance between the neutral line and the earth ground and to decrease the capacitance between the building ground line and the earth ground at the selected frequency; modulating the carrier signal with an information signal such that the carrier signal carries information; and impressing the modulated carrier signal between the first line and the second line, such that the anti-resonant condition is established between the first line and the second line.