[SI-LIST] Re: Quarter wavelength transmission lines



Rich,
A quarter-wave transmission line acts as an impedance transformer:
*  With a transmission line having impedance Zo,
*  Terminated at one end by impedance ZL,
*  The other end of the line will see an impedance of    (Zo * Zo) / ZL.

If you terminate a quarter-wave transmission line in a short circuit, the other
end will look like an open.  Quarter-wave stubs are used a lot in waveguides,
for example, to provide mechanical support without electrically loading down the
signals.

                                                   John Barnes  KS4GL
                                                   Advisory Engineer
                                                   Lexmark International



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