Transmission line switch
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United States of America Patent
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Sep 25, 1990
Grant Date -
N/A
app pub date -
Jun 27, 1989
filing date -
Jul 8, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A transmission line switch allows a single output line (3) to be switched to one of two or more input lines (1,2) to which it is permanently connected at a common junction (4). Each input line (1,2) has an associated amplifier stage (10) which can be biased in a normal high gain (`on`) state, or in an isolation (`off`) state. Suitable biasing in the `off` state ensures that the amplifier stage output presents a low impedance to its own input line, the length (L) of which is chosen to reflect a high impedance at the junction (4) with the other lines. Correct design enables the return loss and insertion loss of the `on` path to be kept to low values while simultaneously offering a high insertion loss to the `off` path signals.
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