An apparatus for high frequency electrical line communication includes a transmitter, a receiver, a modem, and a coupler at each of two or more locations along an electrical line. The couplers have capacitive circuits serially connected with an air-core or dielectric-core transformer. The capacitive...http://www.google.fr/patents/US6396392?utm_source=gb-gplus-shareBrevet US6396392 - High frequency network communications over various lines
High frequency network communications over various lines
