[SI-LIST] Re: four S channels VNA

  • From: "John Fisher (jmfisher)" <jmfisher@xxxxxxxxx>
  • To: <Giovanni.Guasti@xxxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
  • Date: Thu, 21 Jul 2005 10:05:02 -0700

Guasti,
Try;

http://vnahelp.com/

Its a helpful website

John

=20

-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of Guasti Giovanni
Sent: Thursday, July 21, 2005 2:16 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] four S channels VNA

dear all,
our laboratory bought two hibrid junctions a long time ago. I am trying
=3D to obtain a four S channels VNA, placing the hibrid junctions in
series =3D to our two S channel VNA. I would like to realize some
differential =3D scattering measurements (at the moment we couldn't buy =
a
new 4 channel =3D VNA).=3D20 How would you calibrate the whole system? =
Do
you know any article, =3D paper, web-site where I could read more about
it? Do you think a =3D differential to common mode coupling could affect
the measurement?
I'm waiting for all your objections. ;-) Thankyou all,
        Giovanni

             HJ +90=3DB0    |------|       HJ -90=3DB0
                |-------| diff |-------|
  VNA S1-------<        | DUT  |        >------- VNA S2
                |-------|      |-------|
                        |------|
             HJ -90=3DB0                   HJ +90=3DB0
                       =3D20
                        ^      ^
                        |      |
                      sect1   sect2

all cables have same length,
all cables have Z0=3D3D50ohm
Hibrid Junctions have a bandwidth B - so the measure will be done in B
-----------------------------------------------------------
open (S2 is symmetrical)
             HJ +90=3DB0   =3D20
                |-------High impedance
  VNA S1-------<       =3D20
                |-------High impedance
                       =3D20
             HJ -90=3DB0   =3D20
-----------------------------------------------------------
short (S2 is symmetrical)
             HJ +90=3DB0   =3D20
                |-------0ohm
  VNA S1-------<       =3D20
                |-------0ohm
                       =3D20
             HJ -90=3DB0      =3D20
-----------------------------------------------------------
50ohm (S2 is symmetrical)
             HJ +90=3DB0   =3D20
                |-------50ohm
  VNA S1-------<       =3D20
                |-------50ohm
                       =3D20
             HJ -90=3DB0      =3D20
-----------------------------------------------------------
through
             HJ +90=3DB0           HJ -90=3DB0
                |--------------|
  VNA S1-------<                >------- VNA S2
                |--------------|
                       =3D20
             HJ -90=3DB0           HJ +90=3DB0
                       =3D20
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