Transformer coupler for communication over various lines
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United States of America Patent
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-
Jun 18, 2002
Issued Date -
N/A
app pub date -
Jun 25, 1999
filing date -
Apr 28, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An apparatus for 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 transformer. The capacitive circuits resonate with the air-core transformer at a preselected frequency. A novel phase linear coupler eliminates noise and is matched resistively to the characteristic impedance of the line at the preselected frequency, which linearizes communication on the line and allows high speed data and voice communication over long distances.
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