Power line communication system and capacitive signal...

Details Power line communication system and capacitive signal... Power line communication system and capacitive signal...

2011-08-30

2011-08-30

Pascal, Robert (Department: 2817)

Wave transmission lines and networks

Plural channel systems

Having branched circuits

C340S315000

Reexamination Certificate

active

08008989

ABSTRACT:
In power line communications using carrier waves of high frequencies in the MHz range such as 2 to 30 MHz, when a coaxial cable for performing transmission of signals and a power line are signal-coupled using a capacitive signal coupling unit, even if an impedance matching circuit is installed in the capacitive signal coupling unit, we have found that leakage current of levels that cannot be neglected from leakage noise considerations flows through the outer sheath of the coaxial cable that transmits the signals, and, accordingly, leaking electromagnetic waves induced by the leakage current flowing through the coaxial cable due to impedance mismatch between the power line and the capacitive signal coupling unit are reduced by an impedance member showing high impedances at high frequencies in the MHz range.

REFERENCES:
patent: 6014386 (2000-01-01), Abraham
patent: 7307512 (2007-12-01), Yaney et al.
patent: 2004-336456 (2004-11-01), None

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