Patent ID: 8242859

Claim:
A line noise attenuator for purifying an electromagnetic environment by attenuating a noise current superimposed on a conductor line which supplies a signal power to a load from a low frequency signal power source, the conductor line operating as an antenna which transmits and/or receives a high frequency noise current, the attenuator comprising: an inductor with inductance value of L for tolerating flows of a low frequency signal power; and a parallel resistor with a resistance value of R to change the high frequency noise current to heat and to consume the heat, R being set relative to a reactance value of the inductor at an angular frequency of the noise current, such that the high frequency noise current blocked at the inductor can flow, wherein if an internal impedance of the conductor line as the antenna is “Z a =R r +jX a ”, a noise obstruction load impedance of the electronic device having noise obstruction connected to the conductor line is “Z l =R L +jX L ”, a noise lower limit angular frequency set in the line noise attenuator is ω n , and “ω n L>>R”, then an impedance value of the inductor is approximately equal to a pure resistance, and a ratio between the inductance value of the inductor and the resistance value of the parallel resistor is fixed, and the inductor and the parallel resistor are provided to the conductor line.