Patent ID: 7456516

Claim:
A power line terminating circuit provided at terminations of a pair of indoor power lines where a high frequency signal in a communication frequency band is superimposed on an AC power source voltage, comprising: a first capacitor provided between the pair of indoor power lines to suppress fluctuations of a capacitive load in an electric device connected to the terminations of the indoor power lines; one or more inductors provided on the indoor power lines and configuring a series resonance circuit in cooperation with the first capacitor; and one or more resistors respectively provided in parallel with each of the inductors, wherein the series resonance circuit has a series resonance point in a frequency band which is higher than a frequency of the AC power source voltage and is lower than the communication frequency band, the inductors include first and second inductors respectively provided on each of the pair of indoor power lines, the resistors include a first resistor provided in parallel with the first inductor and a second resistor provided in parallel with the second inductor, and the first and second inductors configure the series resonance circuit in cooperation with the first capacitor.