[SI-LIST] four S channels VNA
- From: "Guasti Giovanni" <Giovanni.Guasti@xxxxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Thu, 21 Jul 2005 11:15:46 +0200
dear all,
our laboratory bought two hibrid junctions a long time ago. I am trying =
to obtain a four S channels VNA, placing the hibrid junctions in series =
to our two S channel VNA. I would like to realize some differential =
scattering measurements (at the moment we couldn't buy a new 4 channel =
VNA).=20
How would you calibrate the whole system? Do you know any article, =
paper, web-site where I could read more about it? Do you think a =
differential to common mode coupling could affect the measurement?
I'm waiting for all your objections. ;-)
Thankyou all,
Giovanni
HJ +90=B0 |------| HJ -90=B0
|-------| diff |-------|
VNA S1-------< | DUT | >------- VNA S2
|-------| |-------|
|------|
HJ -90=B0 HJ +90=B0
=20
^ ^
| |
sect1 sect2
all cables have same length,
all cables have Z0=3D50ohm
Hibrid Junctions have a bandwidth B - so the measure will be
done in B
-----------------------------------------------------------
open (S2 is symmetrical)
HJ +90=B0 =20
|-------High impedance
VNA S1-------< =20
|-------High impedance
=20
HJ -90=B0 =20
-----------------------------------------------------------
short (S2 is symmetrical)
HJ +90=B0 =20
|-------0ohm
VNA S1-------< =20
|-------0ohm
=20
HJ -90=B0 =20
-----------------------------------------------------------
50ohm (S2 is symmetrical)
HJ +90=B0 =20
|-------50ohm
VNA S1-------< =20
|-------50ohm
=20
HJ -90=B0 =20
-----------------------------------------------------------
through
HJ +90=B0 HJ -90=B0
|--------------|
VNA S1-------< >------- VNA S2
|--------------|
=20
HJ -90=B0 HJ +90=B0
=20
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