[SI-LIST] Re: Quarter wavelength transmission lines

  • From: jrbarnes@xxxxxxxxxxx
  • To: richard2636@xxxxxxxxxx, si-list@xxxxxxxxxxxxx
  • Date: Wed, 14 Nov 2001 15:20:48 -0500

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

                                                   John Barnes  KS4GL
                                                   Advisory Engineer
                                                   Lexmark International

To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field

or to administer your membership from a web page, go to:

For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field

List archives are viewable at:     
or at our remote archives:
Old (prior to June 6, 2001) list archives are viewable at:

Other related posts: