Patent ID: 7286026

Claim:
A coupling network comprising: a first power line interface port for connecting said network to a power line that carries a power signal characterized by a power line frequency; a power line modem interface configured to be coupled to a power line modem transceiver that receives a signal characterized by a signal frequency; an inductor-capacitor circuit coupled to the power line modem interface and having a low-impedance resonant frequency of the power line modem transceiver; an alternating current ground coupled to a transceiver ground; an inductor having a corner frequency between the signal frequency and the power line frequency, and having a first end and a second end, the first end of the inductor being connected to the inductor-capacitor circuit and the second end of the inductor being coupled to the alternating current ground; and a power supply interface port coupled to the first power line interface port through the inductor.