directional coupler
<communications> (tap) A passive device used in cable systems to divide
and combine radio frequency signals. A directional coupler has at least three
ports: line in, line out, and the tap. The signal passes between line in and
line out ports with loss referred to as the insertion loss. A small portion of
the signal power applied to the line in port passes to the tap port. A signal
applied to the tap port is passed to the line in port less the tap attenuation
value. The tap signals are isolated from the line out port to prevent
reflections. A signal applied to the line out port passes to the line in port
and is isolated from the tap port. Some devices provide more than one tap output
line (multi-taps).
(1995-12-23)
Nearby terms:
Directed Oc « directed set « Direct Inward Dialing «
directional coupler » Directly Executable Test
Oriented Language » direct mapped cache » Direct
Memory Access
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