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US 8,008,989 B2Granted
Power line communication system and capacitive signal coupling unit
AssigneeMitsubishi Electric Corporation
InventorsJunichi Abe, Yuichiro Murata
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AssigneeMitsubishi Electric Corporation
InventorsJunichi Abe, Yuichiro Murata
Estimating the term…
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.
A power line communication system for performing power line communications using carrier waves of high frequencies in the MHz range, the power line communication system comprising:
A power line communication system for performing power line communications using carrier waves of high frequencies in the MHz range, the power line communication system comprising:
A capacitive signal coupling unit applied to a power line communication system and acting to signal-couple a coaxial cable and a power line, the coaxial cable performing transmission of signals, the power line communication system performing power line communications using carrier waves of high frequencies in the MHz range, the capacitive signal coupling unit comprising:
Dependencies are inferred from the claim text.